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
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 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 orders are correct as per the properties mentioned against each?
Column I | Column II | ||
(a) | As2O3 < SiO2 < P2O3 < SO2 | (i) | Acid strength. |
(b) | AsH3 < PH3 < NH3 | (ii) | Enthalpy of vaporisation. |
(c) | S < O < Cl < F | (iii) | More negative electron gain enthalpy. |
(d) | H2O > H2S > H2Se > H2Te | (iv) | Thermal stability. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Match the formulas of oxides are given in Column I with the type of oxide given in Column II and mark the correct option.
Column I | Column II | ||
A. | Pb3O4 | 1. | Neutral oxide |
B. | N2O | 2. | Acidic oxide |
C. | Mn2O7 | 3. | Basic oxide |
D. | Bi2O3 | 4. | Mixed oxide |
Codes
Options: | A | B | C | D |
1. | 1 | 2 | 3 | 4 |
2. | 4 | 1 | 2 | 3 |
3. | 3 | 2 | 4 | 1 |
4. | 4 | 3 | 1 | 2 |
Match the species given in Column I with the shape given in Column II and mark the correct option.
Column I | Column II |
A. SF4 | 1. Tetrahedral |
B. BrF3 | 2. Pyramidal |
C. BrO-3 | 3. Sea-saw shaped |
D. NH4+ | 4. Bent T-shaped |
Codes
A | B | C | D | |
1. | 3 | 2 | 1 | 4 |
2. | 3 | 4 | 2 | 1 |
3. | 1 | 2 | 3 | 4 |
4. | 1 | 4 | 3 | 2 |
Assertion (A): | HI cannot be prepared by the reaction of KI with concentrated H2SO4. |
Reason (R): | HI has the lowest H—X bond strength among halogen acids. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Assertion (A): | NaCl reacts with concentrated H2SO4 to give colourless fumes with a pungent smell. But on adding MnO2, the fumes become greenish-yellow |
Reason (R): | MnO2 oxidizes HCl to chlorine gas which is greenish-yellow. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
On addition of conc. to a chloride salt, colorless fumes are evolved but in case of iodide salt, violet fumes come out. This is because
1. reduces HI to
2. HI is of violet colour
3. HI gets oxidised to
4. HI changes to HI