JEE Main 2026 — 23 January, Evening Shift

If $f(x)=\left\{\begin{array}{cl}\frac{a|x|+x^{2}-2(\sin |x|)(\cos |x|)}{x} & , x \neq 0\\ b & , x=0\end{array}\right.$ is continuous at $\mathrm{x}=0$, then $\mathrm{a}+\mathrm{b}$ is equal to :

Let $\frac{\pi}{2}<\theta<\pi$ and $\cot \theta=-\frac{1}{2 \sqrt{2}}$. Then the value of $\sin \left(\frac{15 \theta}{2}\right)(\cos 8 \theta+\sin 8 \theta)+\cos \left(\frac{15 \theta}{2}\right)(\cos 8-\sin 8 \theta)$ is equal to :

Let $\quad \vec{a}=\hat{i}-2 \hat{j}+3 \hat{k}, \vec{b}=2 \hat{i}+\hat{j}-\hat{k}, \vec{c}=\lambda \hat{i}+\hat{j}+\hat{k}$ and $\vec{v}=\vec{a} \times \vec{b}$. If $\vec{v} \cdot \vec{c}=11$ and the length of the projection of $\vec{b}$ on $\vec{c}$ is $p$, then $9 p^{2}$ is equal to :

Let $\mathrm{A}(1,2)$ and $\mathrm{C}(-3,-6)$ be two diagonally opposite vertices of a rhombus, whose sides AD an BC are parallel to the line $7 \mathrm{x}-\mathrm{y}=14$. If $\mathrm{B}(\alpha, \beta)$ and $\mathrm{D}(\gamma, \delta)$ are the other two vertices, then $|\alpha+\beta+\gamma+\delta|$ is equal to :

Consider two sets $\mathrm{A}=\{\mathrm{x} \in \mathrm{z}:|(|\mathrm{x}-3|-3)| \leq 1\}$ and $B=\left\{x \in \mathbb{R}-\{1,2\}: \frac{(x-2)(x-4)}{x-1} \log _{e}(|x-2|)=0\right\}$. Then the number of onto functions $f: \mathrm{A} \rightarrow \mathrm{B}$ is equal to:

The system of linear equations $x+y+z=6$, $2 x+5 y+a z=36$, $x+2 y+3 z=b$ has

The sum of all the real solutions of the equation $\log _{(x+3)}\left(6 x^{2}+28 x+30\right)=5-2 \log _{(6 x+10)}\left(x^{2}+6 x+9\right)$ is equal to :

If the points of intersection of the ellipses $x^{2}+2 y^{2}-6 x-12 y+23=0$ and $4 \mathrm{x}+2 \mathrm{y}^{2}-20 \mathrm{x}-12 \mathrm{y}+35=0$ lie on a circle of radius $r$ and centre $(a, b)$, then the value of $\mathrm{ab}+18 \mathrm{r}^{2}$ is

Let PQ be a chord of the hyperbola $\frac{\mathrm{x}^{2}}{4}-\frac{\mathrm{y}^{2}}{\mathrm{~b}^{2}}=1$, perpendicular to the x -axis such that OPQ is an equilateral triangle, O being the centre of the hyperbola. If the eccentricity of the hyperbola is $\sqrt{3}$, then the area of the triangle OPQ is :

Let $\overrightarrow{\mathrm{a}}, \overrightarrow{\mathrm{b}}, \overrightarrow{\mathrm{c}}$ be three vectors such that $\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}=2(\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{c}})$.If $|\overrightarrow{\mathrm{a}}|=1,|\overrightarrow{\mathrm{~b}}|=4,|\overrightarrow{\mathrm{c}}|=2$, and the angle between $\vec{b}$ and $\vec{c}$ is $60^{\circ}$, then $|\vec{a} \cdot \vec{c}|$ is :

Bag A contains 9 white and 8 black balls, while bag B contains 6 white and 4 black balls. One ball is randomly picked up from the bag B and mixed up with the balls in the bag A . Then a ball is randomly drawn from the bag A . If the probability, that the ball drawn is white, is $\frac{\mathrm{p}}{\mathrm{q}}, \operatorname{gcd}(\mathrm{p}, \mathrm{q})=1$, then $\mathrm{p}+\mathrm{q}$ is equal to

The area of the region enclosed between the circles $x^{2}+y^{2}=4$ and $x^{2}+(y-2)^{2}=4$ is :

The least value of $\left(\cos ^{2} \theta-6 \sin \theta \cos \theta+3 \sin ^{2} \theta+2\right)$ is

Let $I(x)=\int \frac{3 d x}{(4 x+6)\left(\sqrt{4 x^{2}+8 x+3}\right)}$ and $\mathrm{I}(0)=\frac{\sqrt{3}}{4}+20$. If $\mathrm{I}\left(\frac{1}{2}\right)=\frac{\mathrm{a} \sqrt{2}}{\mathrm{~b}}+\mathrm{c}$, where $\mathrm{a}, \mathrm{b}, \mathrm{c} \in \mathrm{N}, \operatorname{gcd}(\mathrm{a}, \mathrm{b})=1$, then $\mathrm{a}+\mathrm{b}+\mathrm{c}$ is equal to :

The number of ways, in which 16 oranges can be distributed to four children such that each child gets at least one orange, is

Let $\mathrm{A}=\{0,1,2, \ldots .9)$. Let R be a relation on A defined by $(\mathrm{x}, \mathrm{y}) \in \mathrm{R}$ if and only if $|\mathrm{x}-\mathrm{y}|$ is a multiple of 3 . Given below are two statements:

Statement I: $n(R)=36$

Statement II: $R$ is an equivalence relation.

In the light of the above statements, choose the correct answer from the options given below

If $\mathrm{z}=\frac{\sqrt{3}}{2}+\frac{\mathrm{i}}{2}, \mathrm{i}=\sqrt{-1}$, then $\left(\mathrm{z}^{201}-\mathrm{i}\right)^{8}$ is equal to

If the mean and the variance of the data

are $\mu$ and 19 respectively, then the value of $\lambda+\mu$ is

An equilateral triangle OAB is inscribed in the parabola $\mathrm{y}^{2}=4 \mathrm{x}$ with the vertex O at the vertex of the parabola. Then the minimum distance of the circle having AB as a diameter from the origin is :

Let $\sum_{\mathrm{k}=1}^{\mathrm{n}} \mathrm{a}_{\mathrm{k}}=\alpha \mathrm{n}^{2}+\beta \mathrm{n}$. If $\mathrm{a}_{10}=59$ and $\mathrm{a}_{6}=7 \mathrm{a}_{1}$ then $\alpha+\beta$ is equal to

If the solution curve $y=f(x)$ of the differential equation $\left(x^{2}-4\right) y^{\prime}-2 x y+2 x\left(4-x^{2}\right)^{2}=0, x>2$, passes through the point $(3,15)$, then the local maximum value of $f$ is $\_\_\_\_$ :

If the image of the point $\mathrm{P}(\mathrm{a}, 2, \mathrm{a})$ in the line $\frac{\mathrm{x}}{2}=\frac{\mathrm{y}+\mathrm{a}}{1}=\frac{\mathrm{z}}{1}$ is Q and the of image of Q in the line $\frac{x-2 b}{2}=\frac{y-a}{1}=\frac{z+2 b}{-5}$ is $P$, then $a+b$ is equal to

The number of elements in the set $S=\left\{x: x \in[0,100]\right.$ and $\left.\int_{0}^{x} t^{2} \sin (x-t) d t=x^{2}\right\}$ is.....

Let $\mathrm{A}=\left[\begin{array}{ccc}0 & 2 & -3 \\-2 & 0 & 1 \\3 & -1 & 0\end{array}\right]$ and B be a matrix such that $\mathrm{B}(\mathrm{I}-\mathrm{A})=\mathrm{I}+\mathrm{A}$. Then the sum of the diagonal elements of $\mathrm{B}^{\mathrm{T}} \mathrm{B}$ is equal to $\_\_\_\_$ .

Let S denote the set of 4-digit numbers abcd such that $\mathrm{a}>\mathrm{b}>\mathrm{c}>\mathrm{d}$ and P denote the set of 5-digit numbers having product of its digits equal to 20 . Then $\mathrm{n}(\mathrm{S})+\mathrm{n}(\mathrm{P})$ is equal to. .

The internal energy of a monoatomic gas is 3 nRT . One mole of helium is kept in a cylinder having internal cross section area of $17 \mathrm{~cm}^{2}$ and fitted with a light movable frictionless piston. The gas is heated slowly by suppling 126 J heat. If the temperature rises by $4{ }^{\circ} \mathrm{C}$, then the piston will move $\_\_\_\_$ cm. (atmospheric pressure $=10^{5} \mathrm{~Pa}$ )

A body of mass 14 kg initially at rest explodes and breaks into three fragments of masses in the ratio $2: 2: 3$. The two pieces of equal masses fly off perpendicular to each other with a speed of $18 \mathrm{~m} / \mathrm{s}$ each. The velocity of the heavier fragment is $\_\_\_\_$ $\mathrm{m} / \mathrm{s}$.

The current passing through a conducting loop in the form of equilateral triangle of side $4 \sqrt{3} \mathrm{~cm}$ is 2A. The magnetic field at its centroid is $\alpha \times 10^{-5} \mathrm{~T}$. The value of $\alpha$ is $\_\_\_\_$ . (Given : $\mu_{\mathrm{o}}=4 \pi \times 10^{-7}$ SI units)

A paratrooper jumps from an aeroplane and opens a parachute after 2 s of free fall and starts deaccelerating with $3 \mathrm{~m} / \mathrm{s}^{2}$. At 10 m height from ground, while descending with the help of parachute, the speed of paratrooper is $5 \mathrm{~m} / \mathrm{s}$. The initial height of the aeroplane is $\_\_\_\_$ m. $\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right)$

Two shorts dipoles $(A, B), A$ having charges $\pm 2 \mu \mathrm{C}$ and length 1 cm and $B$ having charges $\pm 4 \mu \mathrm{C}$ and length 1 cm are placed with their centres 80 cm apart as shown in the figure. The electric field at a point $P$, equi-distant from the centres of both dipoles is $\_\_\_\_$ N/C.

Two charges $7 \mu \mathrm{C}$ and $-2 \mu \mathrm{C}$ are placed at $(-9,0,0) \mathrm{cm}$ and $(9,0,0) \mathrm{cm}$ respectively in an external field $E=\frac{\mathrm{A}}{\mathrm{r}^{2}} \hat{\mathrm{r}}$, where $A=9 \times 10^{5} \mathrm{~N} / \mathrm{C} . \mathrm{m}^{2}$. Considering the potential at infinity is 0 , the electrostatic energy of the configuration is $\_\_\_\_$ J.

A bead $P$ sliding on a frictionless semi-circular string ( $A C B$ ) and it is at point $S$ at $\mathrm{t}=0$ and at this instant the horizontal component of its velocity is $v$. Another bead $Q$ of the same mass as $P$ is ejected from point $A$ at $\mathrm{t}=0$ along the horizontal string $A B$, with the speed $v$, friction between the beads and the respective strings may be neglected in both cases. Let $t_{p}$ and $t_{Q}$ be the respective times taken by beads $P$ and $Q$ to reach the point $B$, then the relation between $t_{p}$ and $t_{Q}$ is

A parallel plate capacitor with plate separation 5 mm is charged by a battery. On introducing a mica sheet of 2 mm and maintaining the connections of the plates with the terminals of the battery, it is found that it draws $25 \%$ more charge from the battery. The dielectric constant of mica is $\_\_\_\_$ .

An air bubble of volume $2.9 \mathrm{~cm}^{3}$ rises from the bottom of a swimming pool of 5 m deep. At the bottom of the pool water temperature is $17^{\circ} \mathrm{C}$. The volume of the bubble when it reaches the surface, where the water temperature is $27^{\circ} \mathrm{C}$, is $\_\_\_\_$ $\mathrm{cm}^{3}$. ( $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}$, density of water $=10^{3} \mathrm{~kg} / \mathrm{m}^{3}$, and 1 atm pressure is $10^{5} \mathrm{~Pa}$ )

Which of the following pair of nuclei are isobars of the element?

One mole of an ideal diatomic gas expands from volume V to 2 V isothermally at a temperature $27^{\circ} \mathrm{C}$ and does W joule of work. If the gas undergoes same magnitude of expansion adiabatically from $27^{\circ} \mathrm{C}$ doing the same amount of work W, then its final temperature will be (close to) $\_\_\_\_$ ${ }^{\circ} \mathrm{C}$.

A prism of angle $75^{\circ}$ and refractive index $\sqrt{3}$ is coated with thin film of refractive index 1.5 only at the back exit surface. To have total internal reflection at the back exit surface the incident angle can not be $\_\_\_\_$ . ( $\sin 15^{\circ}=0.25$ and $\sin 25^{\circ}=0.43$ )

Suppose a long solenoid of 100 cm length, radius 2 cm having 500 turns per unit length, carries a current $I=10 \sin (\omega \mathrm{t}) \mathrm{A}$, where $\omega=1000 \mathrm{rad} . / \mathrm{s}$. A circular conducting loop (B) of radius 1 cm coaxially slided through the solenoid at a speed $\mathrm{v}=1 \mathrm{~cm} / \mathrm{s}$. The r.m.s. current through the loop when the coil B is inserted 10 cm inside the solenoid is $\alpha / \sqrt{2} \mu \mathrm{~A}$. The value of $\alpha$ is $\_\_\_\_$ . [Resistance of the loop $=10 \Omega$ ]

The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant $\mathrm{k}=3$ and permeability of $\mu=2 \mu_{0}$, is ( $\mu_{0}=$ permeability of vacuum)

When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is $\_\_\_\_$ . $\left(\tan ^{-1}(1.52)=57.7^{\circ}\right.$, refractive indices of air and glass are 1.00 and 1.52 , respectively)

A small metallic sphere of diameter 2 mm and density $10.5 \mathrm{~g} / \mathrm{cm}^{3}$ is dropped in glycerine having viscosity 10 Poise and density $1.5 \mathrm{~g} / \mathrm{cm}^{3}$ respectively. The terminal velocity attained by the sphere is $\_\_\_\_$ $\mathrm{cm} / \mathrm{s}$. ( $\pi=\frac{22}{7}$ and $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}$ )

The average energy released per fission for the nucleus of ${ }_{92}^{235} \mathrm{U}$ is 190 MeV . When all the atoms of 47 g pure ${ }_{92}^{235} \mathrm{U}$ undergo fission process, the energy released is $\alpha \times 10^{23} \mathrm{MeV}$. The value of $\alpha$ is $\_\_\_\_$ . (Avogadro Number $=6 \times 10^{23}$ per mole)

The size of the images of an object, formed by a thin lens are equal when the object is placed at two different positions 8 cm and 24 cm from the lens. The focal length of the lens is $\_\_\_\_$ cm .

A ball of radius r and density $\rho$ dropped through a viscous liquid of density $\sigma$ and viscosity $\eta$ attains its terminal velocity at time t , given by $\mathrm{t}=\mathrm{A} \rho^{\mathrm{a}} \mathrm{r}^{\mathrm{b}} \eta^{\mathrm{c}} \sigma^{\mathrm{d}}$, where A is a constant and $\mathrm{a}, \mathrm{b} \mathrm{c}$ and d are integers. The value of $\frac{b+c}{a+d}$ is $\_\_\_\_$ .

Suppose there is a uniform circular disc of mass M kg and radius r m shown in figure. The shaded regions are cut out from the disc. The moment of inertia of the remainder about the axis A of the disc is given by $\frac{\mathrm{X}}{256} \mathrm{Mr}^{2}$. The value of x is $\_\_\_\_$ .

The velocity of sound in air is doubled when the temperature is raised from $0^{\circ} \mathrm{C}$ to $\alpha^{\circ} \mathrm{C}$. The value of $\alpha$ is $\_\_\_\_$ .

It is noticed that $\mathrm{Pb}^{2+}$ is more stable than $\mathrm{Pb}^{2+}$ but $\mathrm{Sn}^{2+}$ is less stable than $\mathrm{Sn}^{4+}$. Observe the following reactions

Consider the above electrochemical cell where a metal electrode ( M ) is undergoing redox reaction by forming $\mathrm{M}^{+}\left(\mathrm{M} \rightarrow \mathrm{M}^{+}+\mathrm{e}\right)$. The cation $\mathrm{M}^{+}$is present in two different concentrations $\mathrm{c}_{1}$ and $\mathrm{c}_{2}$ as shown above. Which of the following statement is correct for generating a positive cell potential?

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

Identify the CORRECT set of details from the following :

A. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right)^{3+}$ : Inner orbital complex ; d ${ }^{2}$ sp $^{3}$ hybridized

B. $\left[\mathrm{MnCl}_{6}\right]^{3-}$ Outer orbital complex; sp ${ }^{3}$ hybridized

C. $\left[\mathrm{CoF}_{6}\right]^{3}$ : Outer orbital complex ; $\mathrm{d}^{2} \mathrm{sp}^{3}$ hybridized

D. $\left[\mathrm{FeF}_{6}\right]^{3}$ : Outer orbital complex: $\mathrm{sp}^{3} \mathrm{~d}^{2}$ hybridized

E. $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ : Inner orbital complex ; sp ${ }^{3}$ hybridized

Choose the correct answer from the options given below:

Elements X and Y belong to Group 15. The difference between the electronegativity values of 'X' and phosphorus is higher than that of the difference between phosphorus and 'Y'. 'X' and 'Y' are respectively:

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

Statement I: $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ as nine hyperconjugation interactions are possible in $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$.

Statement II: $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ is less stable than $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ as only three hyperconjugation interactions are possible in $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$.

In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg.

Statement II: The ionic radius of $\mathrm{O}^{2-}$ is larger than that of $\mathrm{F}^{-}$.

In the light of the above statements, choose the correct answer from the options given below:

Observe the following reactions at $\mathrm{T}(\mathrm{K})$ I. A → products. II. $5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_{3}^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_{2}(\mathrm{aq})+ 3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

Both the reactions are started at 10.00 am . The rates of these reactions at 10.10 am are same. The value of $-\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta \mathrm{t}}$ at 10.10 am is $2 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{Min}^{-1}$. The concentration of A at 10.10 am is $10^{-2} \mathrm{~mol} \mathrm{~L}^{-1}$. What is the first order rate constant (in $\mathrm{min}^{-1}$ ) of reaction I?

Which of the following statements are TRUE about Haloform reaction?

A. Sodium hypochlorite reacts with KI to give KOI.

B. KOI is a reducing agent.

C. $\alpha, \beta$-unsaturated methylketone will give iodoform reaction.

D. Isopropyl alcohol will not give iodoform test.

E. Methanoic acid will give positive iodoform test.

Choose the correct answer from the options given below:

Which statements are NOT TRUE about $\mathrm{XeO}_{2} \mathrm{~F}_{2}$ ?

A. It has a see-saw shape.

B. Xe has 5 electron pairs in its valence shell in $\mathrm{XeO}_{2} \mathrm{~F}_{2}$.

C. The $\mathrm{O}-\mathrm{Xe}-\mathrm{O}$ bond angle is close to $180^{\circ}$.

D. The $\mathrm{F}-\mathrm{Xe}-\mathrm{F}$ bond angle is close to $180^{\circ}$

E. Xe has 16 valence electrons in $\mathrm{XeO}_{2} \mathrm{~F}_{2}$.

Choose the correct answer from the options given below.

Identify the incorrect statements:

A. $^{24}_{12}\mathrm{Mg}$ represents 24 protons and 12 neutrons.

B. Wavelength of radiation of frequency $4.5 \times 10^{15}\,\mathrm{s^{-1}}$ is $6.7 \times 10^{-8}\,\mathrm{m}$.

C. For $\lambda_1 = 900\,\mathrm{nm}$ with energy $E_1$ and $\lambda_2 = 300\,\mathrm{nm}$ with energy $E_2$, $E_1 : E_2 = 3 : 1$.

D. Number of photons of wavelength $2000\,\mathrm{pm}$ required to supply $1\,\mathrm{J}$ energy is $1.006 \times 10^{16}$.

In Carius method 0.2425 g of an organic compounds gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is

The oxidation state of chromium in the final product formed in the reaction between KI and acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution is:

The work functions of two metals ($\mathrm{M}_{\mathrm{A}}$ and $\mathrm{M}_{\mathrm{B}}$) are in the $1: 2$ ratio. When these metals are exposed to photons of energy 6 eV , the kinetic energy of liberated electrons of $M_{A}: M_{B}$ is in the ratio of 2.642 : 1. The work functions (in eV ) of $\mathrm{M}_{\mathrm{A}}$ and $\mathrm{M}_{\mathrm{B}}$ are respectively.

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

Statement I:

can be synthesized from

using simpler reagents in the order i) Acidic $\mathrm{KMnO}_{4}$, ii) Ammonia, iii) Bromine and alkali

Statement II:

can be converted into

using reagents in order (i)Bromine- $\mathrm{H}_{2} \mathrm{O}$ (ii) $\mathrm{NaNO}_{2} / \mathrm{HCl}\left(0-5{ }^{\circ} \mathrm{C}\right)$ (iii) aq. $\mathrm{H}_{3} \mathrm{PO}_{2}$.

In the light of the above statements, choose the correct answer from the options given below

$\mathrm{X}_{2}(\mathrm{~g})+\mathrm{Y}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{Z}(\mathrm{g})$ $\mathrm{X}_{2}(\mathrm{~g})$ and $\mathrm{Y}_{2}(\mathrm{~g})$ are added to a 1 L flask and it is found that the system attains the above equilibrium at $\mathrm{T}(\mathrm{K})$ with the number of moles of $\mathrm{X}_{2}(\mathrm{~g}), \mathrm{Y}_{2}(\mathrm{~g})$ and $\mathrm{Z}(\mathrm{g})$ being 3, 3 and 9 mol respectively (equilibrium moles). Under this conditions of equilibrium, 10 mol of $\mathrm{Z}(\mathrm{g})$ is added to the flask and the temperature is maintained at $\mathrm{T}(\mathrm{K})$. Then the number of moles of $\mathrm{Z}(\mathrm{g})$ in the flask when the new equilibrium is established is $\_\_\_\_$ . (Nearest integer).

Two liquids A and B form an ideal solution. At 320 K , the vapour pressure of the solution, containing 3 mol of A and 1 mol of B is 500 mm Hg. At the same temperature, if 1 mol of A is further added to this solution, vapour pressure of the solution increases by 20 mm Hg . Vapour pressure (in mm Hg ) of B in the pure state is $\_\_\_\_$ . (Nearest integer)

200 cc of $\mathrm{x} \times 10^{-3} \mathrm{M}$ potassium dichromate is required to oxidise 750 cc of 0.6 M

Mohr's salt solution in acidic medium. Here $\mathrm{x}=$

Total number of unpaired electrons present in the central metal atoms/ions of $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right],\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{PtCl}_{2}\left(\mathrm{NH}_{3}\right)_{2}\right],\left[\mathrm{Ni}\left(\mathrm{CN}_{4}\right)\right]^{2-}$ and $\left[\mathrm{Pt}\left(\mathrm{CN}_{4}\right)\right]^{2-}$ is $\_\_\_\_$ .

In compound (Q), the percentage of oxygen is $\_\_\_\_$ $\%.$ (Nearest integer)