The number of \(\mathrm{S=O}\) bonds present in \(\mathrm{H}_2\mathrm{S}_2 \mathrm{O}_8\) is:

1.	1	2.	2
3.	3	4.	4

Which of the following statements is true?

1 SO₂ bleaches by reduction.

2 Cl₂ bleaches by oxidation.

3 O₃ bleaches by oxidation.

4 All of the above.

Hl cannot be prepared by the action of Kl and H₂SO₄ because 

1. Hl is a much weaker acid than H₂SO₄

2. Hl gets oxidized by H₂SO₄ to form l₂

3. H₂SO₄ is a dehydrating reagent.

4. Hl is less volatile than H₂SO₄

Which of the following is the anhydride of HClO₄?

1. Cl₂O

2. ClO₂

3. Cl₂O₇

4. Cl₂O₆

Which of the following has the least bond angle?

1. H₂O

2. NH₃

3. CH₄

4. CO₂

Hypo on treatment with l₂ gives:

1. Na₂SO₄

2. Na₂S₄O₆

3. Na₂SO₃

4. Na₂S

Which halogen produces O₂ when combined with hot concentrated NaOH?

1. F₂

2. Cl₂

3. Br₂

4. l₂

Which of the following is in correct sequence in terms of acid nature?

1. HClO₂ < HClO₃ < HClO₄

2. H₃PO₄ < H₃PO₃ < H₃PO₂

3. CH₄ < NH₃ < H₂O < HF

4. All of the above.

Sulphuric acid is used:

Which sequence of the following, in terms of boiling point, is correct?

1. ${\mathrm{H}}_3{\mathrm{PO}}_{\mathrm{4<mspace\; width="1em"></mspace>}}<\hspace{0.17em}{\mathrm{H}}_2{\mathrm{SO}}_4$

2. ${\mathrm{H}}_2\mathrm{O<mspace\; width="1em"></mspace>}>\hspace{0.17em}{\mathrm{H}}_2{\mathrm{O}}_2$

3. ${\mathrm{H}}_2\mathrm{O<mspace\; width="1em"></mspace>}>\hspace{0.17em}\mathrm{SiC}$

4. ${\mathrm{NH}}_{\mathrm{3<mspace\; width="1em"></mspace>}}>\hspace{0.17em}\mathrm{HF}$