Iron does not get oxidised in:
1. | Rusting of iron sheets |
2. | Decolourisation of blue CuSO4 solution by iron |
3. | Formation of Fe(CO)5 from Fe |
4. | Liberation of H2 from steam by iron at a high temperature |
Which of the following pairs of substances on reaction will not evolve gas?
1. Iron, and (aq)
2. Iron, and steam
3. Copper, and HCl(g)
4. Sodium, and ethyl alcohol
Which of the following has the highest negative standard electrode potential ?
1. Ti
2. Cu
3. Mn
4. Zn
The magnetic moment of an Mn2+ ion is equal to:
1. | 5.92 BM | 2. | 2.80 BM |
3. | 8.95 BM | 4. | 3.90 BM |
When neutral or faintly alkaline is treated with potassium iodide, the iodide ion is converted into 'X'. The formula of 'X' is:
1.
2.
3.
4.
The incorrect statement among the following is:
1. | There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
2. | Lanthanoid contraction is the accumulation of successive shrinkages. |
3. | As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements. |
4. | The shielding power of 4f electrons is quite weak. |
The acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution turns green when \(\mathrm{Na}_2 \mathrm{SO}_3\) is added to it. This is due to the formation of:
1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm({SO}_3)_3 \) |
3. | \(\mathrm{CrSO}_4 \) | 4. | \(\mathrm{Cr}_2 \mathrm({SO}_4)_3\) |
When copper is heated with conc. it produces:
1. Cu(NO3)2, and NO2
2. NO
3. Cu(NO3)2 , NO, and NO2
4. Cu(NO3)2, and N2 O
The three lanthanides that show a +2 oxidation state are:
1. Sm, Tb, Gd
2. Sm, Eu, Yb
3. La, Gd, Lu
4. Yb, Pm, Sm
What is produced when excessive diluted nitric acid is combined with potassium chromate?
1. Cr2O72- and H2O
2. Cr3+ and Cr2O72-
3. CrO42-
4. Cr2O42-