A water softening reagent among the following is -

1. Ca3(PO4)2

2. Na3PO4

3. Na6P6O18

4. Na2HPO4

Subtopic:  Hard & Soft Water |
 86%
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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%
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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%
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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%
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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 |
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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%
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Which of the following statements about hydrogen are correct?

1. Hydrogen has three isotopes of which protium is the most common
2. Hydrogen never acts as a cation in ionic salts
3. Hydrogen ion, H+, exists freely in solution
4. Dihydrogen does not act as a reducing agent


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

Subtopic:  Hydrogen- Types & Isotopes | Preparation & Properties |
 78%
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Some of the properties of water are described below. Which of them is/are not correct?

a. Water is known to be a universal solvent
b. Hydrogen bonding is present to a large extent in liquid water
c. There is no hydrogen bonding in the frozen state of water
d. Frozen water is heavier than liquid water


1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Water |
 70%
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Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

a. Chlorides of Ca and Mg in water

b. Sulphates of Ca and Mg in water

c. Hydrogen carbonates of Ca and Mg in water

d. Carbonates of alkali metals in water.

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

Subtopic:  Hard & Soft Water |
 86%
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Which of the following statements is correct?

a. Elements of group 15 form electron deficient hydrides
b. All elements of group 14 form electron precise hydrides
c. Electron precise hydrides have tetrahedral geometries.
d. Electron rich hydrides can act as Lewis acids.


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

Subtopic:  Type of Hydride |
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