When sodium peroxide is treated with dilute sulphuric acid, we get _____.

1. Sodium sulphate and water
2. Sodium sulphate and oxygen
3. Sodium sulphate, hydrogen and oxygen
4. Sodium sulphate and hydrogen peroxide

Subtopic:  H2O2 (Hydrogen Peroxide) |
 69%
From NCERT
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Hydrogen peroxide is obtained by the electrolysis of ______.

1.  water

2.  sulphuric acid

3.  hydrochloric acid

4.  fused sodium peroxide

Subtopic:  Preparation & Properties |
 51%
From NCERT
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Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

1.  CH4(g)+H2O(g)Ni1270 KCO(g)+H2(g)

2.  CO(g)+H2O(g)Catalyst673 KCO2(g)+H2(g)

3.  CnH2n+2+nH2O(g)Ni1270 KnCO+(2n+1)H2

4.  CO(g)+2H2(g)CatalystCobaltCH3OH(l)

Subtopic:  Water |
 55%
From NCERT
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Which of the following ions will cause hardness in water sample?

1. Ca2+

2.  Na+

3.  Cl-

4.  K+

Subtopic:  Hard & Soft Water |
 77%
From NCERT
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A water softening reagent among the following is -

1. Ca3(PO4)2

2. Na3PO4

3. Na6P6O18

4. Na2HPO4

Subtopic:  Hard & Soft Water |
 86%
From NCERT
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Elements of which of the following group(s) of periodic table do not form hydrides?

1. Groups 7, 8, 9

2. Group 13

3. Groups 15, 16, 17

4. Group 14

Subtopic:  Type of Hydride |
 90%
From NCERT
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The group that has hydride formed by only one member is -

1.  6

2.  7

3.  8

4.  9

Subtopic:  Type of Hydride |
 81%
From NCERT
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Which of the following statements are not true for hydrogen?

a. It exists as a diatomic molecule.
b. It has one electron in the outermost shell
c.  It can lose an electron to form a cation that can freely exist
d.  It forms a large number of ionic compounds by losing an electron


Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Subtopic:  Hydrogen- Types & Isotopes | Preparation & Properties |
 70%
From NCERT
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Dihydrogen can be prepared on a commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2 gas is formed. It is known as _____.

a.  Water gas

b.  Syngas

c.  Producer gas

d.  Industrial gas

Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Subtopic:  Preparation & Properties |
 88%
From NCERT
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Which of the following statement(s) is/are correct in the case of heavy water?

a. Heavy water is used as a moderator in nuclear reactor
b. Heavy water is more effective as solvent than ordinary water
c. Heavy water is more associated than ordinary water
d. Heavy water has lower boiling point than ordinary water

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Subtopic:  Water |
 71%
From NCERT
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