Which of the following statements is false?
1. ONCl and are isoelectronic.
2. molecule is bent
3. Ozone is violet-black in solid-state
4. Ozone is diamagnetic gas
A chemical that depletes the ozone layer is:
1. Sulphur
2. Chlorofluorocarbons (CFCs)
3. Nitrogen
4. Hydrogen
Sulphuric acid is used:
1. | In lead storage batteries | 2. | In making fertilizers |
3. | As a dehydrating agent | 4. | All of the above |
The catalyst that is used in the contact process is:
1. | Fe2O3 | 2. | Al2O3 |
3. | V2O5 | 4. | SO3 |
The chemical formula of oleum is -
1. | H2S2O8 | 2. | H2S2O7 |
3. | H3S2O6 | 4. | H2SO5 |
A compound among the following that has an -O-O- linkage is:
1.
2.
3.
4.
The acidity of diprotic acids in aqueous solution increases in the order:
1. H2S < H2Se < H2Te
2. H2Se < H2S < H2Te
3. H2Te < H2S < H2Se
4. H2Se < H2Te < H2S
Match the items in Columns I and II and mark the correct option.
Column I | Column II |
A. H2SO4 | 1. Highest electron affinity |
B. CCl3NO2 | 2. Chalcogen |
C. Cl2 | 3. Tear gas |
D. Sulphur | 4. Storage batteries |
Codes:
A | B | C | D | |
1. | 4 | 3 | 1 | 2 |
2. | 3 | 4 | 1 | 2 |
3. | 4 | 1 | 2 | 3 |
4. | 2 | 1 | 3 | 4 |
1. | H2Te | 2. | H2Se |
3. | H2O | 4. | H2S |
An amorphous solid“A” burns in the air to form a gas “B” which turns lime water milky. The gas is also produced as a by-product during the roasting of sulphide ore. This gas decolourises acidified aqueous KMnO4 solution and reduces Fe3+ to Fe2+. The solid "A" and the gas "B" are:
1. 'A' = S8: ‘B' = SO2
2. 'A' = S8: ‘B' = SO3
3. 'A' = S10: ‘B' = SO2
4. Not predictable