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 |
CO2 is used as a fire extinguisher because -
1. has high lattice energy.
2. will be effective in isolating the burning surface from dihydrogen and dioxygen.
3. is lighter than dioxygen.
4. is lighter than dihydrogen.
The correct statement about electron-deficient hydride is that it:
1. | Does not have sufficient electrons to form a regular bond. |
2. | Cannot be represented by conventional Lewis structures. |
3. | Accept electrons. |
4. | All of the above. |
Ionic hydrides are formed by:
1. Transition metals.
2. Elements of very high electropositivity.
3. Elements of very low electropositivity.
4. Metalloids.
The group that has hydride formed by only one member is -
1. 6
2. 7
3. 8
4. 9
A neutral hydride among the following is -
1. H2S
2. H2O
3. H2Se
4. H2Te
Hydrogen combines directly with:
1. Ca
2. Cu
3. Zn
4. Fe
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. |
Ionic hydrides react with water to give:
1. Acidic solutions.
2. Basic solutions.
3. Hydride ion.
4. Protons.