Question 2 :
An organic compound {tex} X {/tex} (molecular formula {tex} C _ { 6 } H _ { 7 } O _ { 2 } N {/tex} ) has six carbon atoms in a ring system, two double bonds and a nitro group as substituent, X is :

Question 3 :
AB crystallizes in a body centred cubic lattice with edge length ' {tex} a {/tex} ' equal to {tex} 387 \mathrm { pm } {/tex}. The distance between two oppositely charged ions in the lattice is:

Question 4 :
{tex} \mathrm { MnO } _ { 4 } ^ { 2 - } ( 1 \mathrm { mole } ) {/tex} in neutral aqueous medium disproportionates to

Question 5 :
On adding 0.1 M solution each of {tex} \left[ \mathrm { Ag } ^ { + } \right] , \left[ \mathrm { Ba } ^ { 2 + } \right] , {/tex} {tex} \left[ \mathrm { Ca } ^ { 2 + } \right] {/tex} in a {tex} \mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 } {/tex} solution, species first precipitated is<br>{tex} \left[ \mathrm { K } _ { \mathrm { sp } } \mathrm { BaSO } _ { 4 } = 10 ^ { - 11 } , \mathrm { K } _ { \mathrm { sp } } \mathrm { CaSO } _ { 4 } = 10 ^ { - 6 } \right. {/tex}, {tex} \left. \mathrm { K } _ { \mathrm { sp } } \mathrm { Ag } _ { 2 } \mathrm { SO } _ { 4 } = 10 ^ { - 5 } \right] {/tex}<br>

Question 6 :
Which of the following statements(s) is/are incorrect?<br>(i) Only {tex} \frac{1}{8} ^ { \text {th } } {/tex} portion of an atom located at corner of a cubic unit cell is its neighbouring unit cell. <br>(ii) Total number of atoms per unit cell for a face centered cubic unit cell is 3.<br> (iii) Atom located at the body center is shared between two adiacent unit cells.<br>

Question 7 :
The element Z = 114 has been discovered recently. It will belong to which of the following family/ group and electronic configuration ?

Question 9 :
Which of the following pairs of species have the same bond order ?

Question 10 :
Vapour pressure of benzene at {tex} 30 ^ { \circ } \mathrm { C } {/tex} is {tex} 121.8 \mathrm { mm } {/tex}. When {tex} 15 \mathrm { g } {/tex} of a non volatile solute is dissolved of the pressure decreased in {tex} 250 \mathrm { g } {/tex} of the molecular weight of the solute to {tex} 120.2 \mathrm { mm } {/tex}. The molecular weight of the solute (Mo.wt. of solvent = {tex}78 {/tex}

Question 11 :
The standard electrode potentials of four elements {tex} \mathrm { A } , \mathrm { B } , \mathrm { C } {/tex} and {tex} \mathrm { D } {/tex} are - 3.05 , - 1.66 , - 0.40 and {tex} + 0.80 . {/tex} The highest chemical reactivity will be exhibited by :

Question 12 :
A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is

Question 14 :
Two electrolytic cells, one containing acidified ferrous chloride and another acidified ferricd of con in series. The ratio of chloride, are connected iron deposited at cathodes in the two cells will be:

Question 16 :
Which of the following representation of excited state of atom is impossible ?

Question 18 :
<p>The {tex}pK_b{/tex} of fluoride ion at 25° is 10, then find the ionisation constant of hydrofluoric acid in water?</p>

Question 21 :
When silicon is heated with {tex}CH_3Cl{/tex} at higher temperature in the presence of Cu :-

Question 22 :
Choose any one of the following four responses. A. If both Assertion & Reason are False. B. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. C. If Assertion is True but the Reason is False. D. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. <br>Assertion :-He and Be have similar outer electronic configuration of type {tex}ns^2{/tex} Reason :- Both are chemically inert

Question 25 :
In which of the following Reaction Hydrogen peroxide act as reducing agent :-

Question 26 :
The hybridization of atomic orbitals of nitrogen in {tex} \mathrm { NO } _ { 2 } ^ { + } , \mathrm { NO } _ { 2 } ^ { - } {/tex} and {tex} \mathrm { NH } _ { 4 } ^ { + } {/tex} are

Question 28 :
{tex} 0.45 \mathrm { g } {/tex} of acid of molecular weight {tex} 90 \mathrm { was } {/tex} neutralized by {tex} 20 \mathrm { ml } {/tex}. of a {tex} 0.5 \mathrm { N } {/tex} caustic potash. The basicity of an acid is

Question 30 :
Solid {tex} \mathrm { Ba } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } {/tex} is gradually dissolved in a {tex} 1.0 \times 10 ^ { - 4 } \mathrm { M } \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex} solution. At which concentration of {tex} \mathrm { Ba } ^ { 2 + } {/tex}, precipitate of {tex} \mathrm { BaCO } _ { 3 } {/tex} begins to form? {tex} \left( K _ { s p } \text { for } \mathrm { BaCO } _ { 3 } = 5.1 \times 10 ^ { - 9 } \right) {/tex}

Question 31 :
Sucrose in water is dextro-rotatory, {tex} [ \alpha ] _ { \mathrm { D } } = + 66.4 ^ { \circ } {/tex} When boiled with dilute {tex}\mathrm {HCl}{/tex}, the solution becomes leavo-rotatory, {tex} [ \alpha ] _ { \mathrm { D } } = - 20 ^ { \circ } . {/tex} In this process the sucrose molecule breaks into

Question 32 :
Ksp of Al(OH)₃ is 4.32x10^-14. pH of its saturated solution is about

Question 36 :
The formation of oxide ion from oxygen atom requires first an exothermic and then an endothermic step as shown below<br>O(g)+ e^- &rarr; O^-(g);&Delta; H⁰ = -141 kJ/mole<br>O^-(g)+ e^- &rarr; O^2-(g);&Delta; H⁰ = +780 kJ/mole<br>Thus process of formation of O^-2 in gas phase is unfavorable even though O^-2 is isoelectronic with neon. It is due to the fact that

Question 39 :
Choose any one of the following four responses. A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. B. If both Assertion & Reason are False. C. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. D. If Assertion is True but the Reason is False. <br>Assertion :-In a reversible endothermic reaction activation energy of the forward reaction is higher than that of the backward reaction. Reason :- The threshold energy of the forward reaction is more than that of the backward reaction.

Question 41 :
Which two elements are in same group and same period :-

Question 43 :
When an electron jumps from 5th excited state to 2nd excited state in H-atom, the number of lines produced in Balmer series is

Question 44 :
Equivalent conductance of an electrolyte containing NaF at infinite dilution is {tex} 90.1 \ \mathrm { Ohm } ^ { - 1 } \mathrm { cm } ^ { 2 } {/tex}. If NaF is replaced by KF what is the value of equivalent conductance?