The catalyst used to increase the production of H, by ‘coal gasification' process is -

1. Copper 

2. FeCr2O4 (iron chromate) 

3. Pd/C 

4. None of the above.

Subtopic:  Hydrogen- Types & Isotopes |
 68%
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Fe+H2O  1023-1073K Product     (Steam)Product formed is -1. FeO+H2

2. Fe2O3+H2O

3. Fe2O3+H2

4. Fe3O4+H2

Subtopic:  Preparation & Properties |
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Hydrogen is placed separately in the periodic table because : 

1. It resembles alkali metals.

2. It shows the same reactions as halogens.

3. Both (1) and (2)

4. None of the above.

Subtopic:  Hydrogen- Types & Isotopes |
 93%
From NCERT
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The following reaction is an example of :

\(2 \mathrm{MnO}_4^{-}+6 \mathrm{H}^{+}+5 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{Mn}^{2+}+8 \mathrm{H}_2 \mathrm{O}+5 \mathrm{O}_2\)

1. Hydrolysis reaction

2. Redox reaction

3. Disproportionation reaction

4. None of the above

Subtopic:  Preparation & Properties | H2O2 (Hydrogen Peroxide) |
 68%
From NCERT
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The incorrect statement among the following options is:

1. K+ ions react with alkaline water and give K(OH)3

2. KCl is a salt of strong acid and strong base.

3. Al(OH)3 in alkaline condition gives [Al(OH)4]-

4. AlCl3 is a salt of strong acid and weak base.

Subtopic:  Hard & Soft Water |
 54%
From NCERT
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The softening of hard water by synthetic ion-exchange resins is based on -

1. Increasing the lattice energy.

2. Physical separation.

3. Lowering the activation energy.

4. Exchange of cations and anions.

Subtopic:  Hard & Soft Water |
 88%
From NCERT
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The temporary and permanent hardness of water is caused by -
1. Permanent hardness is caused by hydrogen carbonates and temporary hardness is caused by chlorides.

2. Temporary hardness is caused by dihydrogen and permanent hardness is caused by oxides.
3. Temporary hardness is caused by insoluble hydrogen carbonates and permanent hardness is caused by chlorides.
4. Temporary hardness is caused by hydrogen carbonates and permanent hardness is caused by chlorides.

Subtopic:  Hard & Soft Water |
 60%
From NCERT
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CO is used as a fire extinguisher because -

1. CO2 has high lattice energy.

2. CO2 will be effective in isolating the burning surface from dihydrogen and dioxygen.

3. CO2 is lighter than dioxygen.

4. CO2 is lighter than dihydrogen.

Subtopic:  Type of Hydride |
 83%
From NCERT
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Atomic hydrogen or oxy-hydrogen torch is used for cutting and welding purposes because:

1. Atomic hydrogen converts into molecular hydrogen and generates a large amount of energy.
2. Atomic hydrogen converts into molecular hydrogen and generates a low amount of energy.
3. Molecular hydrogen converts into atomic hydrogen and generates a large amount of energy.
4. Molecular hydrogen converts into atomic hydrogen and generates a low amount of energy.

Subtopic:  Type of Hydride |
 60%
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Metallic hydrides are useful for hydrogen storage because : 

1. Metallic hydrides are oxygen-rich.

2. Metallic hydrides are oxygen-deficient.

3. Metallic hydrides are hydrogen-rich.

4. Metallic hydrides are hydrogen-deficient.

Subtopic:  Type of Hydride |
 54%
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