Highly soluble hydroxide in water is formed by -

1. Ni2+

2. K+

3. Zn2+

4. Al3+

Subtopic:  Physical Properties |
 74%
From NCERT
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The strongest reducing agent among the following is:

1. K

2. Na

3. Al

4. Mg

Subtopic:  Physical Properties |
 55%
From NCERT
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When crystal of caustic soda is exposed to air, a liquid layer is deposited because:

1. crystal melts

2. crystal loses water

3. crystal absorbs moisture and CO2

4. crystal sublimes

Subtopic:  Physical Properties |
 82%
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Which one of the following is formed on dissolving I2 in aqueous solution of KI ?

1. KIO4

2. KIO

3. KI3

4. KIO3

Subtopic:  Physical Properties |
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Brine is chemically:

1. conc. solution of Na2CO3

2. conc. solution of Na2SO4

3. conc. solution of NaCl

4. conc. solution of alum

Subtopic:  Physical Properties | Chemical Properties |
 84%
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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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

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
 73%
From NCERT
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KO2 is used in oxygen cylinder in space air craft and submarines because it:

1. absorbs CO2 and increase O2 content

2. eliminate moisture

3. absorbs CO2

4. produces O2

Subtopic:  Physical Properties | Chemical Properties |
 68%
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