Highly soluble hydroxide in water is formed by -

1. Ni²⁺

2. K⁺

3. Zn²⁺

4. Al³⁺

A colourless salt gives violet colour to Bunsen flame and also turns moistured litmus paper blue. It Is:

1. Na₂CO₃

2. KNO₃

3. K₂CO₃

4. Cu(OH)₂

Hypo is chemically:

1. Na₂S₂O₃.2H₂O

2. Na₂S₂O₃.3H₂O

3. Na₂S₂O₃.4H₂O

4. Na₂S₂O₃.5H₂O

If NaOH is added to an aqueous solution of Zn²⁺ ions, a white precipitate appears and on adding axcess NaOH, the precepitate dissolves. In this solution zinc exists in the:

1. cationic part

2. anionic part

3. both in cationic and anionic parts

4. there is no zinc left in the solution

Brine is chemically:

1. conc. solution of Na₂CO₃

2. conc. solution of Na₂SO₄

3. conc. solution of NaCl

4. conc. solution of alum

Sodium reacts with water less vigorously than potassium because:

1. it has higher atomic weight

2. it is less electropositive

3. it is more electronegative

4. it is metal

NO₂ is obtained by heating:

1. CsNO₃

2. KNO₃

3. LiNO₃

4. NaNO₃

Common table salt becomes moist and does not pour easily in rainy season because:

1. It contains magnesium chloride.

2. It contains magnesium carbonate.

3. It melts slightly in rainy season.

4. Sodium chloride is hygroscopic.

Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

1. A light blue precipitate is first formed which finally dissolves to give a deep blue solution

2. A white precipitate appears which dissolves to give a colourless solution.

3. A white precipitation is formed which does not dissolve 

4. No change takes place and the solution remains clear

The products of the electrolysis of aqueous solution of common salt are:

1. Na + Cl₂

2. H₂ + O₂

3. NaOH + H₂ + Cl₂

4. NaOH + Cl₂ + O₂