True statement among the following options is/are:

1.	NH3 is a covalent molecule.
2.	The metals of d–block form metallic or non–stoichiometric hydrides.
3.	Potassium hydride reacts violently with water.
4.	All of these.

Incorrect statement among the following options is:

The strength of 11.2 volume solution of H₂O₂ is :

[Given that molar mass of H = 1g mol^–1 and O = 16g mol^–1]

1. 1.7%

2. 34%

3. 3.4%

4. 13.6%

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

1. Gamma $\left(\gamma \right)$

2. Neutron (n)

3. Beta $\left({\beta }^{-}\right)$

4. Alpha $\left(\alpha \right)$

Consider the following reaction.
Cl₂ + H₂ → A
H₂ + Na → B
H₂ + CuO → C  + H₂O

A, B and C in the above mentioned reaction are respectively-

1. A= HCl; B= NaH₂; C= Cu₂O
2. A= HCl; B= NaH; C= Cu₂O
3. A= No reaction; B= NaH; C= Cu
4. A= HCl; B= NaH; C= Cu

The one that is not suitable for the removal of permanent hardness of water is:

1.  Treatment with sodium carbonate
2.  Calgon's method
3.  Clark's method
4.  Ion-exchange method

Dihydrogen of high purity (> 99.95%) is obtained through

The incorrect statement among the following options is:

1. K⁺ ions react with alkaline water and give K(OH)₃

2. KCl is a salt of strong acid and strong base.

3. Al(OH)₃ in alkaline condition gives [Al(OH)₄]^-

4. AlCl₃ is a salt of strong acid and weak base.

Hydrolysis and hydration are:

1. Different chemical process

2. Same chemical process

3. Can be used simultaneously

4. All of these

The reaction in which hydrogen peroxide acts as a reducing agent is/are-

1. ${\mathrm{Mn}}^{+2} \hspace{0.17em}+{\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{Mn}}^{+4} +\hspace{0.17em}2{\mathrm{OH}}^{-}$

2. $\mathrm{PbS} +4{\mathrm{H}}_2{\mathrm{O}}_2 \to {\mathrm{PbSO}}_4 +\hspace{0.17em}4{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{I}}_2 + {\mathrm{H}}_2{\mathrm{O}}_2 + 2{\mathrm{OH}}^{-} \to 2{\mathrm{I}}^{-} +\hspace{0.17em}2{\mathrm{H}}_2\mathrm{O}\hspace{0.17em}+ {\mathrm{O}}_2$

4. All of the above