When 8.74 g $\mathrm{MnO_2}$ is treated with HCl, then what will be the weight of $\mathrm{Cl_2}$ (g) obtained? Molar mass of $\mathrm{MnO_2} = 87.4 \text{ g/mol}$
(A) 7.1 g
(B) 17.1 g
(C) 14.2 g
(D) 3.55 g

Reactivity of following on the basis of $\mathrm { S } _ { \mathrm { N } } 1$ mechanism.
(I) [structure 1]
(II) [structure 2]
(III) [structure 3]
(IV) [structure 4]
(A) $\mathrm { I } > \mathrm { II } > \mathrm { III } > \mathrm { IV }$
(B) II $>$ I $>$ III $>$ IV
(C) IV $>$ II $>$ III $>$ I
(D) IV $=$ II $>$ III $>$ I

$100 \mathrm {~g} 98 \%$ by weight $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ is mixed with $100 \mathrm {~g} 49 \%$ by weight $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$. Mole fraction of $\mathbf { H } _ { \mathbf { 2 } } \mathbf { S O } _ { \mathbf { 4 } }$ in solution is (A) 0.9 (B) 0.1 (C) 0.67 (D) 0.34

Which of the following undergo nitration at fastest rate?\ (A) $\left. \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NO } _ { 2 } \right) ^ { - R }$\ (B) $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 3 }$\ (C) $\mathrm { C } _ { 6 } \mathrm { H } _ { 3 } \underset { - R } { \mathrm { COOH } }$\ (D) $\mathrm { C } _ { 6 } \mathrm { H } 3 \mathrm { Br }$

Which of the following molecule gives iodoform reaction. (A) [structure shown in image] (B) [structure shown in image] (C) [structure shown in image] (D) [structure shown in image]

Which of the following will show positive tollens test
(A)
(B)
(D)
(D)

Given: $\Delta \mathrm { H } _ { \text {atom } } \left( \mathrm { CH } _ { 4 } \right) = \mathrm { xkJ } \mathrm { mole } ^ { - 1 }$ $\Delta \mathrm { H } _ { \text {atom } } \left( \mathrm { C } _ { 2 } \mathrm { H } _ { 6 } \right) = \mathrm { y } \mathrm { kJ } \mathrm { mole } ^ { - 1 }$ Find out bond energy ( $\mathrm { C } - \mathrm { C }$ ) ( $\mathrm { kJ } / \mathrm { mole }$ )
(A) $\mathrm { y } = \mathrm { x }$
(B) $\mathrm { y } - 4 \mathrm { x }$
(C) $\mathrm { y } - \frac { 3 \mathrm { x } } { 2 }$
(D) $\mathrm { y } - 2 \mathrm { x }$

In period 4 of the periodic table which elements have the highest and lowest atomic radii respectively． （A） K and Br （B）Na and Cl （C）K and Se （D） Rb and Br

In 'S' estimation, $\mathbf { 0 . 3 1 4 ~ g }$ )of organic compound gave $\mathbf { 0 . 4 8 1 3 ~ g }$ of barium sulphade. What is \% of 'S' in organic compound?

Some species are given: $\mathrm{Ni^{2+}}$, $\mathrm{Fe^{2+}}$, $\mathrm{Co^{2+}}$, $\mathrm{V^{3+}}$ and $\mathrm{Ti^{2+}}$
How many species have magnetic moment (spin only) less than 3 BM.

( \mathrm { A } ) \mathrm { C } _ { 8 } \mathrm { H } _ { 9 } \mathrm { ON } \left( \mathrm { Br } _ { 2 } + \mathrm { KOH } \right) \mathrm { B } \xrightarrow { \mathrm { HNO } _ { 2 } } \mathrm { C } \xrightarrow { \mathrm { CUCN } + \mathrm { HCN } } \mathrm { D } \xrightarrow { \mathrm { H } _ { 3 } \mathrm { O } ^ { + } } \mathrm { E }
Identify A
(A) [structure A]
(B) [structure B]
(C) [structure C]
(D) [structure D]

Which of the following is a mixed oxide? (A) $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ (B) $\mathrm { PbO } _ { 2 }$ (C) [structure] (D) $\mathrm { BaO } _ { 2 }$

Among the following compounds\ $\mathrm { HNO } _ { 3 } , \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } , \mathrm { O } _ { 3 } , \mathrm { NF } _ { 3 }$\ Bond angle for the compound which has highest number of lone pairs.\ (A) $116 ^ { \circ }$\ (B) $107 ^ { \circ }$\ (C) $120 ^ { \circ }$\ (D) $102 ^ { \circ }$

What is the oxidation state of chromium in the product when $\mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 }$ reacts with acidified KI (A) + 6 (B) + 3 (C) + 4 (D) + 5

In Dumas method, 292 mg of organic compound yields $50 \mathrm {~mL} \mathrm {~N} _ { 2 } ( \mathrm {~g} )$ at 300 K and 715 mm Hg pressure. Find \% of 'N' in organic compound. Aqueous tension i = $\mathbf { 1 5 ~ m m ~ H g }$

Two compounds A \& B form ideal solution. If mole fraction of A in vapour is 0.8 Calculate $\mathbf { m o l }$ fraction of A in liquid ( $\mathrm { P } _ { \mathrm { A } } ^ { 0 } = 55$ torr, $\mathrm { P } _ { \mathrm { B } } ^ { 0 } = 15$ torr)
(A) 0.4
(B) 0.52
(C) 0.6
(D) 0.7

For a first order reaction find $\frac { \mathrm { t } _ { 1 / 8 } } { \mathrm { t } _ { 1 / 10 } } \times 10$ (A) 29 (B) 31 (C) 0.9 (D) 9

Given below are two statements
Statement-I: The correct order for radius is $\mathrm{Al > Mg^+ > Mg^{2+} > Al^{3+}}$
Statement-II: Atomic size always depends on electronegativity.
In the light of the above statements, choose the correct option.
(A) Statement-I and II are correct
(B) Both Statement-I and II are incorrect
(C) Statement-I is correct but Statement-II incorrect
(D) Statement-I incorrect but Statement-II correct

What is the formal change of atoms numbered as $1,2,3 \& 4$
(A) $0 , + 1,0 , - 1$
(B) 0, 0, -1, +1
(C) +1, -1, 0, 0
(D) -1, +1, 0, 0

Consider the following data :-
$\mathrm { Na } ( \mathrm {~s} ) + \frac { 1 } { 2 } \mathrm { Cl } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { NaCl } ( \mathrm {~s} )$ $\Delta H ^ { \circ } = - 411 \mathrm {~kJ} / \text { mole } ^ { - 1 }$
$\mathrm { Na } ( \mathrm {~s} ) \rightarrow \mathrm { Na } ( \mathrm {~g} )$ $\Delta H ^ { \circ } = 107 ( \mathrm {~kJ} / \text { mole }$
$\mathrm { Cl } _ { 2 } ( \mathrm {~g} ) \rightarrow ( 2 \mathrm { Cl } ( \mathrm {~g} )$ $\Delta H ^ { \circ } = 242 ( \mathrm {~kJ} / \text { mole }$
$\mathrm { Cl } ( \mathrm {~g} ) + \mathrm { e } ^ { - } \rightarrow \mathrm { Cl } ^ { - } ( \mathrm { g } )$ $\Delta H ^ { \circ } = - 355 ( \mathrm {~kJ} ) \text { mole }$
$\mathrm { Na } ( \mathrm {~g} ) \rightarrow \mathrm { Na } ^ { + } ( \mathrm { g } ) + \mathrm { e } ^ { - }$ $\Delta H ^ { \circ } = 502 \mathrm {~kJ} / \text { mole }$

For the following change,\
$$\underset { 5 ^ { \circ } \mathrm { C } } { \mathrm { H } _ { 2 } \mathrm { O } ( \ell ) } \rightarrow \underset { 100 ^ { \circ } \mathrm { C } } { \mathrm { H } _ { 2 } \mathrm { O } ( \mathrm {~g} ) }$$\
Select the correct answer:\ (A) q = +ve, w = +ve, $\Delta \mathbf { H } = + \mathbf { v e }$\ (B) $\mathbf { q } = - \mathbf { v e } , \mathbf { w } = - \mathbf { v e } , \mathbf { \Delta H } = + \mathbf { v e }$\ (C) $\mathbf { q } = + \mathbf { v e } , \mathbf { w } = - \mathbf { v e } , \boldsymbol { \Delta } \mathbf { H } = + \mathbf { v e }$\ (D) $\mathbf { q } = - \mathbf { v e } , \mathbf { w } = - \mathbf { v e } , \mathbf { \Delta H } = - \mathbf { v e }$

Phenol react with Na give gas X and benzoic acid react with $\mathrm { NaHCO } _ { 3 }$ give gas Y find out molecular mass of X + Y
(A) 4846
(B) 86
(C) 4
(D) 60

Identify pair having same Bond order having both paramagnetic species

Choose the correct statements in respect of hydrides of Group-15. A. Reducing power increasing down the group. B. Basic nature increases down the group. C. Stability decreases down the group. D. Boiling point decreases regularly down the group. (A) A,B and C only (B) A, B and D only (C) A and C only (D) B, C and D only

Find concentration of $\mathrm{X^{2-}}$ at equilibrium in 0.1 M $\mathrm{H_2X}$.
Given: $\mathrm{Ka_1} = 2.5 \times 10^{-7}$, $\mathrm{Ka_2} = 1 \times 10^{-13}$
(A) $2.5 \times 10^{-7}$
(B) $1 \times 10^{-13}$
(C) $6 \times 10^{-12}$
(D) $5 \times 10^{-10}$