Q. No.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)
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)
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)
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)
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)
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)
Which of the following statements is correct?
a. Hydrides of group 13 act as Lewis acids
b. Hydrides of group 14 are electron deficient hydrides
c. Hydrides of group 14 act as Lewis acids
d. Hydrides of group 15 act as Lewis base
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Which of the following statements is/are correct?
1. Metallic hydrides are deficient in hydrogen
2. Metallic hydrides conduct heat and electricity
3. Ionic hydrides do not conduct electricity in solid-state
4. All of the above
Correlate the items listed in Column I with those listed in Column II.
| Column I | Column II |
| A. Synthesis gas | 1. Na2[Na4(PO3)6 ] |
| B. Heavy water | 2. Mixture of CO and H2 |
| C. Calgon | 3. Prolonged electrolysis of water |
| D. Salt like hydrides | 4. Stoichiometric compounds of s-block elements |
Codes
| A | B | C | D | |
| 1. | 4 | 3 | 2 | 1 |
| 2. | 2 | 3 | 1 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Match Column I with Column II for the given properties/applications mentioned therein.
|
Column I |
Column II |
|
A. H |
1. Used in the name of perhydrol. |
|
B. H2 |
2. Can be reduced to dihydrogen by NaH. |
|
C. H2O |
3. Can be used in hydroformylation of olefin. |
|
D. H2O2 |
4. Can be used in cutting and welding |
Codes
| Options: | A | B | C | D |
| 1. | 4 | 3 | 2 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
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