The catalyst that is used in the contact process is:

1. Fe₂O₃

2. Al₂O₃

3. V₂O₅

4. SO₃

The chemical formula of oleum is - 

1. H₂S₂O₈

2. H₂S₂O₇

3. H₃S₂O₆

4. H₂SO₅

The correct order of bond dissociation energy of halogens ${\text{F}}_2, {\mathrm{Cl}}_2, {\mathrm{Br}}_2 \mathrm{and} {\mathrm{I}}_2$ is-

1. F₂ < Cl₂ < Br₂ < I₂

2. I₂ > Br₂ > F₂ > Cl₂

3. Cl₂ > Br₂ < F₂ > I₂

4. I₂ < F₂ < Br₂ < Cl₂

What is the correct sequence of the basic strength hydrides in increasing order?

1. BiH₃ \(\simeq \) SbH₃ < AsH₃ < PH₃ < NH₃ 
2.  BiH₃  > NH₃  > PH₃ > SbH₃ > AsH₃ 
3. SbH₃ < AsH₃ < PH₃ < NH₃ < BiH₃ 
4. AsH₃ > NH₃ > PH₃ > SbH₃ > BiH₃​​​​​​​

The bonding present in nitrogen molecules is:
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.

The element from group 15 that forms a strong bond with hydrogen is:
1. N
2. P
3. As
4. Sb

The condition that does not exist in the Haber process for the manufacturing of ammonia is?
1. Pressure (around 200 ×10⁵ Pa)
2. Temperature (700 K)
3. Catalyst such as iron oxide
4. Presence of inert gases

Assertion: Phosphorous (V) has a tendency to only gain electrons as it is in its highest oxidation state.

Reason: PCl₅ can act as an oxidizing as well as a reducing agent.

1. Assertion is true and Reason is correct explanation of Assertion.

2. Assertion is true but Reason is not the correct explanation of Assertion.

3. Assertion is true but Reason is false.

4. Both Assertion and Reason are false.

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