Hot conc. acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. into two gaseous products?
1. | Cu | 2. | S |
3. | C | 4. | Zn |
A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When an excess of this gas reacts with an unstable trihalide is formed. In this process, the oxidation state of nitrogen changes from-
1. –3 to +3
2. –3 to 0
3. –3 to +5
4. 0 to –3
In the preparation of compounds of Xe, Bartlett had taken as a base compound. This is because:
1. | Both O2 and Xe have the same size. |
2. | Both O2 and Xe have the same electron gain enthalpy. |
3. | Both O2 and Xe have almost the same ionisation enthalpy. |
4. | Both Xe and O2 are gases. |
In solid-state, PCl5 exists as:
1. | Covalent solid. |
2. | Octahedral structure. |
3. | Ionic solid with [PCl6]+ octahedral and [PCl4]- tetrahedral. |
4. | Ionic solid with [PCl4]+ tetrahedral and [PCl6]- octahedral. |
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.
Ion |
|||
Reduction potential E- /V |
= 1.19V |
= 1.65V |
= 1.74V |
If chlorine gas is passed through a hot NaOH solution, two changes are observed in the oxidation number of chlorine during the reaction. These are ......... and .............
a. 0 to +5
b. 0 to +3
c. 0 to -1
d. 0 to +1
Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Which of the following is correct for P4 molecule of white phosphorus?
a. It has 6 lone pairs of electrons
b. It has six P — P single bonds
c. It has three P — P single bonds
d. It has four lone pairs of electrons
Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
Which of the following statements are correct?
a. | Among halogens, the radius ratio between iodine and fluorine is maximum. |
b. | Leaving F — F bond, all halogens have weaker X — X bond than X — X' bond in interhalogens. |
c. | Among interhalogen compounds a maximum number of atoms are present in iodine fluoride. |
d. | Interhalogen compounds are more reactive than halogen compounds. |
1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)
Which of the following statements are correct for SO2 gas?
a. | It acts as a bleaching agent in moist conditions. |
b. | Its molecule has linear geometry. |
c. | Its dilute solution is used as a disinfectant. |
d. | It can be prepared by the reaction of dilute H2SO4 with metal sulphide. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Which of the following statements are correct?
a. | All the three N – O bond lengths in HNO3 are equal. |
b. | All P – Cl bond lengths in PCl5 molecule in the gaseous state are equal. |
c. | P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive. |
d. | PCl5 is ionic in a solid-state in which cation is tetrahedral and the anion is octahedral. |