A mixture of sodium oxide and calcium oxide are dissolved in water, and saturated with excess carbon dioxide gas. The resulting solution...... is It contains ....... :

• basic; NaOH and Ca(OH)₂

• neutral; Na₂CO₃ and CaCO₃

• Basic; Na₂CO₃ and CaCO₃

• Acidic; NaOH and Ca(OH)₂

The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution, is

• CaSO₄.NH₄Cl, H₂O

• CaCl₂.(NH₄)₂SO₄ , H₂O

• CaSO₄.(NH₄)₂SO₄ 2H₂O

• CaCl₂, NH₄Cl.2H₂O

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

• MgO, H₂O, CO₂

• Mg(HCO₃)₂, H₂O

• Mg(OH)₂, H₂O

• Mg, CO₂, H₂O

Exhausted permutit does not contain ...... ion

• Na⁺

• Mg²⁺

• Al³⁺

• Si⁴⁺

In the hardening stage of plaster of paris, the compound formed is

• CaSO₄

• Orthorhombic CaSO₄.2H₂O

• CaSO₄.2H₂O

• Monoclinic CaSO₄.2H₂O

Sodium is heated in air at 300°C to form X. X absorbs CO₂ and forms Na₂CO₃ and Y. Which of the following is Y ?

• H₂

• O₂

• H₂O₂

• O₃

In which of the following reactions, MgO is not formed?

• Mg + CO₂ →

• Mg + dil. HNO₃ →

• Mg + NO $\stackrel{∆}{\to }$

• Mg + B₂O₃

Observe the following statements:

I. Bleaching powder is used in the preparation of chloroform.

II. Bleaching powder decomposes in the presence of CoCl₃ to liberate O₃.

III. Aqueous KHF₂ is used in the preparation of fluorine.

The correct combination is :

• I, II and III are correct

• Only II is correct

• Only I and III are correct

• Only I and II are correct

Which of the following statements are correct for alkali metal compounds ?

(i) Superoxides are paramagnetic in nature.

(ii) The basic strengths of hydroxides increases down the group.

(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.

(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.

• (i), (ii) and (iii) only

• (i) and (ii) only

• (ii), (iii) and (iv) only

• (iii) and (iv) only

60.

CaOCl₂ + H₂O → Ca(OH)₂ + X

X + CH₃CHO →  Y

Y + Ca(OH)₂  → CHCl₃

 What is 'Y'?

• CH₃CH(OH)₂

• CH₂Cl₂

• CCl₃CHO

• CCl₃COCH₃