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)

Q 6 :

The $I.E_1$ among the group 13 member follows as

• $B>Al>Ga<Tl<In$

   

• $B>Ga>Al>Tl>In$

   

• $B>Tl>Ga>Al>In$

   

• $Al>Ga>Tl>B>In$

   

Q 7 :

The correct statements from the following are:

A)  The increasing order of atomic radii of group 13 elements is $B<Al<Ga<In<Tl$.

B)  Al dissolves in dil. HCl and liberate $H_2$ but conc. $HN{O}_3$ renders Al passive by forming a protective oxide layer on the surface.

C)  All elements of group 13 exhibits highly stable +1 oxidation state.

D)  Hybridisation of Al in ${\left[Al{\left(H_{2}O\right)}_6\right]}^{3+}$ ion is $s{p}^3{d}^2$.

Choose the correct answer from the options given below:

• (B) and (D) only

   

• (A) and (C) only

   

• (A), (B) and (C) only

   

• (A) and (B) only