Which of the following is not a condition used in the Haber process for the manufacture of ammonia?

1. Pressure (around 200 ×10⁵ Pa)
2. Temperature (700 K)
3. Catalyst such as iron oxide.
4. Presence of inert gases.

Number of moles of copper used when

(i) Copper reacts with dilute nitric acid

(ii) Copper reacts with concentrated nitric acid

are respectively:-

1. 1,1

2. 1,3

3. 3,1

4. 3,3

Which of the following Group 15 elements does not have a d-orbital in its valence shell?

Which of the following Group 15 hydrides has the least basic character?

1. BiH₃

2. AsH₃

3. PH₃

4. NH₃

Which of the following statements about red phosphorus is incorrect?

1. It is hard and crystalline.

2. It is poisonous.

3. It is less reactive than white phosphorus.

4. It is insoluble in water.

Which element exhibits the highest catenation property?

1. Phosphorus

2. Nitrogen

3. Antimony

4. Bismuth

The gas released on heating H₃PO₃ is 

1. Oxygen

2. Phosphine

3. Hydrogen

4. Water vapours

What role does PCl₅ play in a redox reaction?

1. Reducing agent

2. Oxidising agent

3. Dehydrating Agent

4. None of the above.

The electron gain enthalpies for the formation of O⁻ and O²⁻ from oxygen atoms
are −141 kJ mol⁻¹ and +702 kJ mol⁻¹, respectively.
Which of the following statements regarding oxide formation is correct?

1. The higher the electron gain enthalpy, the lower the lattice energy.

2. The higher the electron gain enthalpy, the higher the lattice energy.

3. The higher the electron gain enthalpy, the greater the stability of the oxide.

4. O⁻ is more stable than O²⁻.

The group which contains the strongest oxidizing agent is-

1. Group 15

2. Group 16

3. Group 17

4. Group 18