Molecular formula of Glauber's salt is :

1. MgSO4·7H2O

2. CuSO4·5H2O

3. FeSO4·7H2O

4. Na2SO4·10H2O

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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Among the following, which has minimum solubility in water?

1. KOH

2. CsOH

3. LiOH

4. RbOH

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 62%
From NCERT
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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.

Subtopic:  Physical Properties |
From NCERT
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A  mixture of Al(OH)3 and Fe(OH)3 can be separated easily by treating it with:

1. HCl

2. NH4OH

3. HNO3

4. NaOH

Subtopic:  Physical Properties |
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Alkali metals are characterised by:

1. Good conductors of heat and electricity.

2. High melting points.

3. Low oxidation potentials.

4. High ionisation potentials.

Subtopic:  Physical Properties |
 64%
From NCERT
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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

Subtopic:  Chemical Properties |
 64%
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Which has lowest thermal stability?

1. Li2CO3

2. Na2CO3

3. K2CO3

4. Rb2CO3

Subtopic:  Chemical Properties |
 76%
From NCERT
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An alkali metal that reacts with nitrogen to form nitride is -

1. Li

2. Na

3. Cs

4. None of the above.

Subtopic:  Chemical Properties |
 91%
From NCERT
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Caustic soda is:

1. Efflorescent

2. Deliquescent

3. Hygroscopic

4. Oxidant

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 65%
From NCERT
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The most basic oxide among the following is:

1. Na2O

2. BaO

3. As2O3

4. Al2O3

Subtopic:  Chemical Properties |
 55%
From NCERT
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