Q. The compounds $P,Q$ and $S$ were separately subjected to nitration using $HN{O}_3/H_{2}S{O}_4$ mixture. The major product formed in each case respectively is

Q. The total number of diprotic acids among the following is:

1. $6$
2. $5$
3. $4$
4. $2$

Q. Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is:

1. $1$ and diamagnetic
2. $0$ and diamagnetic
3. $0$ and paramagnetic
4. $1$ and paramagnetic

Q. The species having pyramidal shape is :

1. $S{O}_3$
2. $Br{F}_3$
3. $Si{O}_3^{2-}$
4. $OS{F}_2$

Q. Total number of geometrical isomers for the complex $\left[RhCl\right(CO\left)\right(PP{h}_3\left)\right(N{H}_3\left)\right]$ is:

Q. The packing efficiency of the two-dimensional square unit cell shown in the given figure is :

1. $39.27\%$
2. $74.05\%$
3. $68.02\%$
4. $78.54\%$

Q. Silver (atomic weight $=108$ g mol${}^{-1}$) has a density of $10.5$ $gc{m}^{-3}$. The number of silver atoms on a surface of area ${10}^{-12}{m}^2$ can be expressed in scientific notation as $y\times {10}^x$. The value of $x$ is :

1. 7
2. 6
3. 9
4. 8

Q. In the reaction the structure of the product T is :

1. 
   
2. 
   
3. 
   
4. 
   

Q. The complex showing a spin-only magnetic moment of $2.82B.M$. is:

1. $Ni(CO{)}_4$
2. $Ni(PP{h}_3{)}_4$
3. $[NiC{l}_4{]}^{2-}$
4. $\left[Ni\right(CN{)}_4{]}^{2-}$

Q. One mole of an ideal gas is taken from a to b along two paths denoted by the solid and the dashed lines as shown in the graph above. If the work done along the solid line path is $w_s$ and that along the dotted line path is $w_d$, then the integer closest to the ratio $w_d/w_s$ is :

1. 1
2. 2
3. 3
4. 4

Q. Among the given elements: $O,Cl,F,N,P,Sn,Tl,Na$ and $Ti$, the number of elements showing only one non-zero oxidation state is :

1. $4$
2. $2$
3. $3$
4. $5$