Question 1 :
Molarity of solution containing $12.6$ grams of oxalic acid in $100\ ml$ of the solution is: 

Question 3 :
An aqueous solution of concentrated hydrobromic acid contains $48\%$ $HBr$ by mass. If the density of the solution is $1.50$ g/mL, what is its concentration?<br>

Question 4 :
Potassium permanganate acts as an oxidising agent in acidic, alkaline as well as neutral media. Which among the following statements is incorrect?

Question 5 :
<div>For $H$-like atoms :</div><div>&#160; &#160; &#160;&#160;</div><div>&#160; &#160; &#160; &#160; &#160; &#160; $\displaystyle E_n=-\frac{Z^2Rh}{n^2};u_n=\frac{u_1Z}{n}$ and $r_n=\frac{r_1\times n^2}{Z};$ where $Rh$ is Rydberg.<br/></div><br/>What is the potential energy of electron in $2^{nd}$ orbit of $H$-atom?<br/>

Question 6 :
The number of revolutions of an electron in the second Bohr orbit in one second is:<br>

Question 7 :
The quantum number n of the state finally populated in $He^{+}$ ions is&#160;<br/>

Question 8 :
The longest wave length radiation emitted in the emission spectrum when the pion de-excites from n = 3 to ground state lies in which of the following region?

Question 9 :
$0.7\ g$ of $Na_{2}CO_{3}. xH_{2}O$ is dissolved in $100\ ml, 20\ ml$ of which required $19.8\ ml$ of $0.1\ N\ HCl$. The value of $x$ is:

Question 10 :
Among cellulose, polyvinyl chloride, nylon and natural rubber, in which of the polymer intermolecular force of attraction is weakest?

Question 13 :
In an ionic compound $A^+$ $X^-$ the degree of covalent bonding is greatest when :

Question 16 :
At STP, a gas that contains $6.02\times 10^{23}$ atoms and it forms diatomic molecules will occupy&#160;:

Question 17 :
A certain reaction is non spontaneous at {tex} 298 \mathrm { K } {/tex}. The entropy change during the reaction is {tex} 121 \mathrm { JK } ^ { - 1 } {/tex}. If the reaction is endothermic or exothermic, the minimum value of {tex} \Delta \mathrm { H } {/tex} for the reaction is

Question 19 :
{tex} \Delta \mathrm { H } _ { \mathrm { f } } ^ { \mathrm { o } } {/tex} of water is {tex} - 285.8 \mathrm { kJ } \mathrm { mol } ^ { - 1 } {/tex}. If enthalpy of neutralisation of monoacidic strong base is {tex} - 57.3 \mathrm { kJmol } ^ { - 1 } . \Delta \mathrm { H } _ { \mathrm { f } } ^ { \circ } {/tex} of {tex} \mathrm { OH } ^ { - } {/tex} ion will be

Question 20 :
The equilibrium constants $K_{p_1}$ and $K_{p_2}$ for the reactions $A\rightleftharpoons 2B$ and $P\rightleftharpoons Q+R$, respectively, are in the ratio of 2 : 3. If the degree of dissociation of $A$ and $P$ are equal, the ratio of the total pressure at equilibrium is:<br/>

Question 21 :
$P{Cl}_{5}$ is dissociating $50$% at ${250}^{o} C$ at a total pressure of $P$ atm. If equilibrium constant is ${K}_{p}$, then which of the following relation is numerically correct?

Question 22 :
<div>Find the oxidation number of elements in each case .<br/></div><div><br/></div>$O$ in&#160; $ O_2,O_3, OF_2$ and&#160;$BaO_2$.

Question 23 :
A compound contains three elements $X, Y$ and $Z$. The oxidation number of $X, Y$ and $Z$ are $+3, +5$ and $-2$ respectively. The possible formula of the compound is:

Question 25 :
Arrange the following alkanes in the increasing order of their boiling point:<br/>pentane, hexane, $2-3-$ <br> $dimethyl-butane$<br/>

Question 26 :
Which one of the following is applicable to the conformations of a hydrocarbon?

Question 27 :
A schematic analysis of the reaction of one enantiomer with racemic mixture is shown below<br> $\begin{matrix}d &amp; + &amp; d\, and\, l &amp; \rightarrow &amp; (d)-(d)\\ The\, (+)\, form\, of &amp; &amp; A\, racemic\, mixture\, of &amp; &amp;+ \\ chiral\, molecules &amp; &amp; other\, molecules\, with\, &amp; &amp;(d)-(l) \\ &amp; &amp; 50\%\, (d)\,and\, 50\%\, (l) &amp; &amp; \end{matrix}$<br><br>The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the mirror image of (d-d) is (l-l) not (d-l). They are diastereomers, 'stereoisomers that are not mirror images'.<br>The formation of diastereomers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general procedure for separating enantiomers is to allow them to react with naturally occurring chiral molecule to form a pair of diastereomers. These can be separated easily as they have different physical properties. if the original chemical reaction can be reversed, the enantiomers can be isolated.<br>Which of the following is not true ?

Question 28 :
$AB$ crystallises in a bcc lattice with edge length an equal to 387 pm. The distance between two oppositely charged ions in the lattice is:<br/>

Question 29 :
$Al$(at.wt.$27$) crystallizes in the cubic system with a cell edge of $4.05\mathring { A } $. Its density is $2.7g/{ cm }^{ 3 }$. Determine the unit cell type and calculate the radius of the $Al$ atom.

Question 31 :
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

Question 33 :
Detection of sulphur in sodium extract (Lassaigne test) is not done by which of the following reagents ?<br/>

Question 34 :
Henry law constant for the solubility of methane in benzene at 298K is $4.27\times { 10 }^{ 5 }$ mm Hg then the solubility of methane in benzene at 298K under 760mm Hg is:<br/>

Question 35 :
When gas is bubbled through water at $298K$, a very dilute solution of gas is obtained. Henry's law constant for the gas is $100kbar$. If gas exerts a pressure of $1$ bar, number of moles of gas dissolved in $1$ litre of water is:

Question 36 :
The vapour pressure of a certain liquid is given by the equation:<br/>$log_{10}P=3.54595+\dfrac {313.7}{T}+1.40655 log_{10}T$, where, P is the vapour pressure in mm and T is temperature in K. The molar latent heat of vaporisation as a function of temperature and &#160;its value in cal&#160;at 80 K is :<br/>

Question 37 :
How much oxygen is dissolved in $100mL$ water at $298K$ if partial pressure of oxygen is $0.5atm$ and ${K}_{H}=1.4\times {10}^{-3}$ $mol/L/atm$?

Question 38 :
Given;<div>(i) $Cu^{2+}+2e^- \rightarrow Cu,\ E^{\circ}=0.337&#160; V$<br/>(ii) $Cu^{2+}+e^- \rightarrow Cu^+, \ E^{\circ}=0.153&#160; V$</div><div><br/>Electrode potential $E^{\circ}$ for the reaction,<br/>$Cu^+ + e^- \rightarrow Cu$, will be:<br/></div>

Question 39 :
Given that the standard reduction potentials for ${ { M }^{ + } }/{ M }$ and ${ { N }^{ + } }/{ N }$ electrodes at $298 K$ are $0.52 V$ and $0.25 V$ respectively. Which of the following is correct in respect of the following electrochemical cell?<br>$M | { M }^{ + } || { N }^{ + } | N$

Question 40 :
For a homogeneous gaseous reaction $A \rightarrow 3B,$ if pressure after time t was $P_{r}$ and after completion of reaction, pressure was $P_{\infty}$ then select correct relation

Question 41 :
Statement 1: Leaching is employed in the extraction of aluminium, silver and gold.&#160;<div>Statement 2:<b> </b>During leaching, the impurities in the ore are chemically removed by dissolving them in a suitable reagent.</div>

Question 42 :
When propyne is treated with dilute $H_{2}SO_{4}$ and $HgSO_{4}$, the major product is

Question 43 :
$RCOOH+{N}_{3}H\xrightarrow [ ]{ { H }_{ 2 }{ SO }_{ 4 } } R{NH}_{2}+{CO}_{2}+{N}_{2}$<br>the above reaction is called:

Question 45 :
<table class="table table-bordered"><tbody><tr><td>&#160;$Glucose$ $+ CH_{3}OH \overset{HCl(g)}\rightarrow$</td><td>(1)Mannose<br/><br/></td></tr><tr><td>&#160;$Sucrose$ $+ H_{3}O^{+} \rightarrow $</td><td>(2) Galactose&#160;</td></tr><tr><td>&#160;$Fructose$ $ \overset{Base}{\rightarrow}$</td><td>(3) Glucose<br/></td></tr><tr><td>&#160;$Lactose$ $+ H_{3}O^{+}\rightarrow $</td><td>(4) Fructose</td></tr><tr><td>&#160;</td><td>(5)&#160;Glucoside</td></tr></tbody></table>