Which of the following types of π-bonding is present in the N₂ molecule?
1. \(p\pi-p\pi\)
2. \(p\pi-d\pi\)
3. \(d\pi-d\pi\)
4. Only sigma bond

Which of the following is true about reactivity of group 15 elements?

1. Stability of their hydrides increases down the group.

2. Higher oxides are acidic in nature.

3. All elements form pentahalides.

4. They do not react with metals.

Which of the following Group 15 elements forms the strongest bond with hydrogen?

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