Which of the statements given below is incorrect?

1. Cl₂O₇ is an anhydride of perchloric acid

2. O₃ molecule is bent

3. ONF is isoelectronic with Anionic NO2

4. OF₂ is an oxide of fluorine

The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr >

HCl. What explains the higher boiling point of hydrogen fluoride?

1. The electronegativity of fluorine is much higher than for other elements in the group

2. There is strong hydrogen bonding between HF molecules

3. The bond energy ol HF molecules is greater than in other hydrogen halides

4. The effect of nuclear shielding is much reduced in fluorine which polarises the HF

molecule

Strong reducing behaviour of H₃PO2 is due to -

1. Presence of one-OH group and two P-H bonds

2. High electron gain enthalpy of phosphorus

3. High oxidation state of phosphorus

4. Presence of two-OH groups and one P-H bond

Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been isolated. The gas X is

1. H₂S

2. SO₂

3. CO₂

4. SO₃

When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation

number of chlorine changes from

1. zero to +1 and zero to -5

2. zero to -1 and zero to +5

3. zero to -1 and zero to +3

4. zero to +1 and zero to -3

Among the following which is the strongest oxidising agent ?

1. F₂

2. Br₂

3. I₂

4. Cl₂

The maximum bond angle at nitrogen is present in which of the following?

1. NO₂

2. NO_2^-

3. NO_2⁺

4. NO3_^-

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is

shown by one of these compounds. but not by the other?

1. Forms acid-rain

2. Is a reducing agent

3. Is soluble in water

4. ls used as a food-preservative

The product obtained as a result of a reaction of nitrogen with CaC₂ is:

1. CaCN         

2. CaCN₃

3. Ca₂CN       

4. CaCN₂

The correct statement about given acids is: