Q.

Aniline reacts with mixed acid (conc. HNO3HNO_{3}HNO3​ and conc.H2SO4conc. H_{2}SO_{4}conc.H2​SO4​) at $288K$ to given $P(51$%), $Q(47$%) and $R(2$%). The major product(s) the following reaction sequence is/are:

Q. Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of $Pb$ produced per kg of $O_2$ consumed is________.

Q. In the following reaction sequence, the amount of $D$ (in g) formed from 10 moles of acetophenone is:
(Atomic weight in $gmo{l}^{-1}:H=1,C=12,N=14,O=16,Br=80$. The yield (%) corresponding to the product in each step is given in the parenthesis).

Q. For a first order reaction $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$ at constant volume and $300K$, the total pressure at the beginning $(t=0)$ and at time are $P_0$ and $P_t$ respectively. Initially, only $A$ is present with concentration $[A{]}_0$, and $t_{1/3}$ is the time required for the partial pressure of $A$ to reach $1/3^{rd}$ of its initial value. The correct option(s) is/are:
(Assume that all these gases behave as ideal gases).

1. 
   
2. 
   
3. 
   
4. 
   

Q. The Fischer presentation of $D-glucose$ is given above.
The correct structure(s) of $\beta -L-$ glucopyranose is/are:

1. 
   
2. 
   
3. 
   
4. 
   

Q. The surface of copper gets tarnished by the formation of copper oxide. $N_2$ gets was passed to prevent the oxide formation during heating of copper at $1250K$. However, the $N_2$ gas contains $1$ mole % of water vapour as impurity. The water vapour oxidises copper as per the reaction given below:
$2Cu\left(s\right)+H_{2}O\left(g\right)\to C{u}_{2}O\left(s\right)+H_2\left(g\right)$
${\rho }_{H_2}$ is the minimum partial pressure of $H_2$ (in bar) needed to prevent the oxidation at $1250K$. The value of $ln\left({\rho }_{H_2}\right)$ is _________.

Q. The correct option(s) regarding the complex $\left[Co\right(en\left)\right(N{H}_3{)}_3\left(H_{2}O\right){]}^{3+}$ $(en=H_{2}NC{H}_{2}C{H}_{2}N{H}_2)$ is/are:

1. It is paramagnetic.
2. It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands.
3. It has two geometrical isomers.
4. It absorbs light at a longer wavelength as compared to $\left[Co\right(en\left)\right(N{H}_3{)}_4{]}^{3+}$.

Q. For the given compound $X$, the total number of optically active stereoisomers is __________.

Q. The correct option(s) to distinguish nitrate salts of $M{n}^{2+}$ and $C{u}^{2+}$ taken separately is/are:

1. $M{n}^{2+}$ shows the characteristic green colour in the flame test.
2. Only $C{u}^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in acidic medium.
3. Only $M{n}^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in faintly basic medium.
4. $C{u}^{2+}/Cu$ has higher reduction potential than $M{n}^{2+}/Mn$ (measured under similar conditions).

Q. For a reaction, $A\rightleftharpoons P$, the plots of $\left[A\right]$ and $\left[P\right]$ with time at temperature $T_1$ and $T_2$ are given below.
If $T_2>T_1$, the correct statement(s) is/are:
(Assume $△H^{\theta }$ and $△S^{\theta }$ are independent of temperature and ratio of $lnK$ at $T_1$ to $lnK$ at $T_2$ is greater than $\frac{T_2}{T_1}$. Here $H,S,G$ and $K$ are enthalpy, entropy, Gibbs energy and equilibrium constant, respectively.)

1. $△H^{\theta }<0,△S^{\theta }<0$
2. $△G^{\theta }<0,△H^{\theta }>0$
3. $△G^{\theta }<0,△S^{\theta }<0$
4. $△G^{\theta }<0,△S^{\theta }>0$

Q. To measure the quantity of $MnC{l}_2$ dissolved in an aqueous solution, it was completely converted to $KMn{O}_4$ using the reaction, $MnC{l}_2+K_2{S}_2{O}_8+H_{2}O\to KMn{O}_4+H_{2}S{O}_4+HCl$ (equation not balanced).
Few drops of concentrated $HCl$ were added to this solution and gently warmed. Further, oxalic acid $\left(225g\right)$ was added in portions till the colour of the permanganate ion disappeared. The quantity of $MnC{l}_2$ (in mg) present in the initial solution is:
(Atomic weights in $gmo{l}^{-1}:Mn=55,Cl=35.5)$.

Q. The total number of compounds having at least one bridging oxo group among the molecules given below is: