The addition of non-metals like B and C to the interstitial sites of a transition metal increases
1. Ductility
2. Melting Point
3. Shining
4. Conductivity
Which of the following metals does not form amalgam?
1. Fe
2. Au
3. Zn
4. Ag
The element of the first transition series having lowest oxidation potential value is -
1. Mn
2. Fe
3. Ni
4. Cu
The incorrect statement among the following about the chemistry of 3d and 4f series elements is
1. | 3d elements show more oxidation states than 4f series elements. |
2. | The energy difference between 3d and 4s orbitals is very little. |
3. | Europium (ll) is more stable than Ce (ll). |
4. | The paramagnetic character of the 3d series elements increases from scandium to copper. |
Which of the following elements has the strongest metallic bond?
1. | Fe | 2. | Sc |
3. | V | 4. | Cr |
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. |
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 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
Which compound cannot decolourise KMnO4 solution?
1. CO3-2
2. NO2-
3. S2-
4. Cl-
Which of the following statements is false?
1. | MnO2 dissolves in conc. HCl, but does not form Mn4+ ions. |
2. | oxidizes hot concentrated liberating oxygen. |
3. | is formed when infused KOH is oxidized by air, , or |
4. | The decomposition of acidic is not catalyzed by sunlight. |