Q. No.Which of the following elements does not show allotropy?
1. Nitrogen
2. Bismuth
3. Antimony
4. Arsenic
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Which of the following statements is wrong?
1. Single N–N bond is stronger than the single P–P bond.
2. PH3 can act as a ligand in the formation of coordination compound with transition elements.
3. NO2 is paramagnetic in nature.
4. Covalency of nitrogen in N2O5 is four.
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Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is:
1. Bi2O5
2. BiF5
3. BiCl5
4. Bi2S5
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On heating ammonium dichromate and barium azide separately we get
1. N2 in both cases
2. N2 with ammonium dichromate and NO with barium azide
3. N2O with ammonium dichromate and N2 with barium azide
4. N2O with ammonium dichromate and NO2 with barium azide
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In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia.
The moles of NO produced by the oxidation of two moles of NH3 will be ______.
1. 2
2. 3
3. 4
4. 6
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Which of the following are peroxoacids of sulphur?
1. H2SO5 and H2S2O8
2. H2SO5 and H2S2O7
3. H2S2O7 and H2S2O8
4. H2S2O6 and H2S2O7
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Hot conc. H2SO4 acts as moderately strong oxidising agent. It oxidises both metals and nonmetals. Which of the following element is oxidised by conc. H2SO4 into two gaseous products?
1. Cu
2. S
3. C
4. Zn
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A black compound of manganese reacts with a halogen acid to give greenish-yellow gas. When excess of this gas reacts with NH3 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
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In the preparation of compounds of Xe, Bartlett had taken as a base compound. This is because
1. Both O2 and Xe have same size.
2. Both O2 and Xe have same electron gain enthalpy.
3. Both O2 and Xe have almost same ionisation enthalpy.
4. Both Xe and O2 are gases.
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