Hydrogen combines directly with:

1. Ca

2. Cu

3. Zn

4. Fe

Subtopic:  Type of Hydride |
 59%
From NCERT
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Acidified solution of chromic acid on treatement with H2O2 yields :

1. CrO3 + H2O + O2

2. Cr2O2 + H2O + O2

3. CrO5 + H2O + K2SO4

4. H2Cr2O7 + H2O + O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
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What is formed when calcium carbide reacts with heavy water?

1. C2D2

2. CaD2

3. Ca2D2O

4. CD2

Subtopic:  Hydrogen- Types & Isotopes |
 63%
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Ionic hydrides react with water to give:

1. Acidic solutions.

2. Basic solutions.

3. Hydride ion.

4. Protons.

Subtopic:  Type of Hydride |
 59%
From NCERT
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A neutral hydride among the following is -

1. H2S

2. H2O

3. H2Se

4. H2Te

Subtopic:  Type of Hydride |
 80%
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Which is used to determine hardness of water volumetrically ?

1. H2C2O4

2. Na2S2O3

3.Sod. citrate

4. Di sodium salt of EDTA

Subtopic:  Hard & Soft Water |
 59%
From NCERT
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The ratio of electron, proton and neutron in tritium is:

1. 1:1:1

2. 1:1:2

3. 2:1:1

4. 1:2:1

Subtopic:  Preparation & Properties |
 81%
From NCERT
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Both temporary and permanent hardness are removed on boiling water with:

1. Ca(OH)2

2. Na2CO3

3. CaCO3

4. CaO

Subtopic:  Hard & Soft Water |
 55%
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When H2O2 is added to acidic ferrous sulphate solution:

1. electrons are gained by Fe2+

2. electrons are lost by Fe2+

3. there is no loss or gain of electrons

4. iron hydroxide precipitates

Subtopic:  H2O2 (Hydrogen Peroxide) |
 69%
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Which of the following pairs will not produce dihydrogen gas ?

1. Cu + HCl (dil.)

2. Fe + H2SO4

3. Mg + steam

4. Na + alcohol

Subtopic:  Preparation & Properties |
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