Which of the following statements is not correct?
1. Copper liberates hydrogen from acids
2. In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine
3. are oxidising agents in an aqueous solution
4. are reducing agents in an aqueous solution
When acidified the solution is added to Sn++ salt then Sn++ changes to
1. Sn
2. Sn3+
3. Sn4+
4. Sn+
Highest oxidation state of manganese in fluoride is +4(Mn) but highest oxidation state in oxides is +7() because
1. | Fluorine is more electronegative than oxygen |
2. | Fluorine does not possess d orbitals |
3. | Fluorine stabilises lower oxidation state |
4. | In covalent compounds, fluorine can form single bond only while oxygen forms double bond |
Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because............. .
1. Both belong to d-block
2. Both have same number of electrons
3. Both have similar atomic radius
4. Both belong to the same group of the Periodic Table
Why is HCl not used to make the medium acidic in oxidation reactions of in acidic medium?
1. | Both HCl and KMnO4 act as oxidising agents |
2. | KMnO4 oxidises HCl into Cl2, which is also an oxidising agent |
3. | KMnO4 is a weaker oxidising agent than HCl |
4. | KMnO4 acts as a reducing agent in the presence of HCl |
Match Column I (Catalyst) with Column II (Process), and mark the appropriate option:
Column I - (Catalyst) | Column II - (Process) | ||
A. | Ni in the presence of hydrogen | 1. | Contact process |
B. | Cu2Cl2 | 2. | Vegetable oil to ghee |
C. | V2O5 | 3. | Sandmeyer reaction |
D. | Finely divided iron | 4. | Haber's process |
5. | Decomposition of KClO3 |
Codes:
A | B | C | D | |
1. | 3 | 4 | 2 | 5 |
2. | 2 | 3 | 1 | 4 |
3. | 5 | 4 | 3 | 2 |
4. | 4 | 5 | 3 | 2 |
Match the compounds/elements given in Column I with uses given in Column II.
Column (Compound/element) |
Column II (Use) |
||
A. | Lanthanoid oxide | 1. | Petroleum cracking |
B. | Lanthanoid | 2. | Television screen |
C. | Mischmetal | 3. | Lanthanoid metal + iron |
D. | Mixed oxides of lanthanoids are employed |
4. | Production of iron alloy |
Codes
Options: | A | B | C | D |
1. | 2 | 1 | 4 | 3 |
2. | 1 | 2 | 3 | 4 |
3. | 2 | 4 | 3 | 1 |
4. | 4 | 1 | 3 | 2 |
Match the properties given in Column I with uses given in Column II
Column I-(Property) | Column II-(Metal) | ||
A. | An element that can show +8 oxidation state | 1. | Mn |
B | 3d block element that can show up to +7 | 2. | Cr |
C | 3d block element with the highest melting point | 3. | Os |
4. | Fe |
A | B | C | |
1. | 3 | 1 | 2 |
2. | 1 | 2 | 3 |
3. | 1 | 4 | 3 |
4. | 4 | 2 | 3 |
Match the statements given in Column I with the oxidation states given in Column and mark the correct option.
Column I |
Column II |
A. Oxidation state of Mn in is |
1. +2 2. +3 |
B. Most stable oxidation state of Mn is |
3. +4 |
C. Most stable oxidation state of Mn in oxides is |
4. +5 |
D. Characteristic oxidation state of lanthanoids is |
5. +7 |
Codes
Options: | A | B | C | D |
1. | 2 | 3 | 4 | 1 |
2. | 3 | 1 | 5 | 2 |
3. | 5 | 4 | 3 | 2 |
4. | 4 | 5 | 3 | 2 |