A gas that can readily decolorize an acidified KMnO4 solution is:
1.
2.
3.
4.
Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:
1. | Zinc is lighter than iron. |
2. | Zinc has a lower melting point than iron. |
3. | Zinc has a lower negative reduction potential than iron. |
4. | Zinc has a higher negative reduction potential than iron. |
1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \) |
3. | \(\mathrm{MnO}_4^{-} \) | 4. | \(\mathrm{MnO}_4^{2-}\) |
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II
and select the correct match:
Column I | Column II |
A. Co3+ | i. √8 B.M. |
B. Cr3+ | ii. √35 B.M. |
C. Fe3+ | iii. √15 B.M. |
D. Ni2+ | iv. √24 B.M. |
A | B | C | D | |
1. | iv | iii | ii | i |
2. | i | ii | iii | iv |
3. | iv | i | ii | iii |
4. | iii | iv | i | ii |
1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Which of the following statements is false?
1. | On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed. |
2. | Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis. |
3. | K2Cr2O7 solution in an acidic medium is orange. |
4. | K2Cr2O7 solution becomes yellow in increasing the pH beyond 7 |
Which compound cannot decolourise KMnO4 solution?
1. CO3-2
2. NO2-
3. S2-
4. Cl-
The native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :
1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Argon
The incorrect statement among the following regarding Cerium is :
1. | The +4 oxidation state of cerium is not known in solutions. |
2. | The +3 oxidation state of cerium is more stable than the +4 oxidation state. |
3. | The common oxidation states of cerium are +3, and +4. |
4. | Cerium (IV) acts as an oxidizing agent. |
The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:
1. | Higher | 2. | Equal |
3. | Lower | 4. | Can't compare. |