Q 1 :

Consider the following reactions

${\text{Na}}_2{\text{B}}_4{\text{O}}_7\stackrel{\Delta }{\to }2X+Y$

${\text{CuSO}}_4+Y\stackrel{\text{Non-luminous flame}}{\to }Z+{\text{SO}}_3$

$2Z+2X+\text{Carbon}\stackrel{\text{Luminous flame}}{\to }2Q+{\text{Na}}_2{\text{B}}_4{\text{O}}_7+\text{CO}$

The oxidation states of Cu in Z and Q, respectively are:  [2026]

• +2 and +2

   

• +1 and +1

   

• +2 and +1

   

• +1 and +2

   

Q 2 :

Which is not correct in case of Be and Al?

• Both are rendered passive by conc. ${\mathrm{HNO}}_3$

   

• Both give hydroxides which are basic

   

• Carbides of both give methane on hydrolysis

   

• Both give covalent chlorides

   

Q 3 :

Correct order of ${\mathrm{IP}}_1$ is

• $\mathrm{B}>\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}$

   

• $\mathrm{B}>\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}$

   

• $\mathrm{B}>\mathrm{Ga}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}$

   

• $\mathrm{B}>\mathrm{Al}>\mathrm{Ga}>\mathrm{Tl}>\mathrm{In}$

   

Q 4 :

Assertion (A): In water, orthoboric acid behaves as weak monobasic acid.

Reason (R): In water, orthoboric acid acts as proton donor.

• Assertion (A) is True, Reason (R) is True; Reason (R) is a Correct explanation for Assertion (A)

   

• Assertion (A) is True, Reason (R) is True; Reason (R) is NOT a Correct explanation for Assertion (A)

   

• Assertion (A) is True, Reason (R) is False

   

• Assertion (A) is False, Reason (R) is True

   

Q 5 :

Maximum number of atoms present in a plane in diborane is X. Maximum number of atoms present in a plane in Borazine is Y. Then, what is the value of $\frac{X+Y}{2}$ ?

(Consider those planes which contain maximum number of atoms)