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Q. No.PCl5 is formed whereas NCl5 is not formed because:
| 1. | Phosphorous has vacant d-orbitals while nitrogen does not have vacant d-orbitals. |
| 2. | PCl5 is stable while NCl5 is unstable. |
| 3. | Phosphorous is more reactive while nitrogen is inert. |
| 4. | Phosphorous has a large size while nitrogen has a small size. |
Subtopic: Group 15 - Preparation, Properties & Uses |
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Consider the following reaction,
\(\begin{aligned} &\mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{A}+\mathrm{HCl} \\ &\mathrm{A}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{B}+\mathrm{HCl} \end{aligned}\)
then the maximum numbers of ionizable hydrogen in B are:
1. 2
2. 0
3. 3
4. 1
\(\begin{aligned} &\mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{A}+\mathrm{HCl} \\ &\mathrm{A}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{B}+\mathrm{HCl} \end{aligned}\)
then the maximum numbers of ionizable hydrogen in B are:
1. 2
2. 0
3. 3
4. 1
Subtopic: Group 16 - Preparation, Properties & Uses |
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Lead nitrate decomposes on heating as:
\(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{A}+\mathrm{PbO}+\mathrm{O}_{2} \)
'A' on dimerization gives 'B', then the number of bridging oxygen atom(s) in 'B' is:
1. 1
2. 0
3. 2
4. 3
\(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{A}+\mathrm{PbO}+\mathrm{O}_{2} \)
'A' on dimerization gives 'B', then the number of bridging oxygen atom(s) in 'B' is:
1. 1
2. 0
3. 2
4. 3
Subtopic: Group 15 - Preparation, Properties & Uses |
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| Statement-I: | E2O5 is less acidic than E2O3 (element E belongs to 15th group). |
| Statement-II: | E2O3 acidic strength decreases down the group (element E belongs to 15th group). |
| 1. | Both Statement-I & Statement-II are true. |
| 2. | Both Statement-I & Statement-II are false. |
| 3. | Statement-I is true while Statement-II is false. |
| 4. | Statement-I is false while Statement-II is true. |
Subtopic: Group 15 - Preparation, Properties & Uses |
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Subtopic: Group 15 - Preparation, Properties & Uses |
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Subtopic: Group 17 - Preparation, Properties & Uses |
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Given below are two statements :
| Statement I: | α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. |
| Statement II: | At room temperature, the stable crystalline form of sulphur is monoclinic sulphur. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Statement I is true but Statement II is false. |
| 4. | Both Statement I and Statement II are false. |
Subtopic: Group 16 - Preparation, Properties & Uses |
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On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be-
1. (NH4)2Cr2O7
2. Pb(NO3)2
3. NaN3
4. NH4NO2
Subtopic: Group 15 - Preparation, Properties & Uses |
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Aqua regia is used for dissolving noble metals (Au, pt, etc.). The gas evolved in this process is:
1. N2O5
2. N2O3
3. N2
4. NO
Subtopic: Group 17 - Preparation, Properties & Uses |
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If the boiling point of H2O is 373 K, the boiling point of H2S will be:
1. Greater than 300 K but less than 373 K
2. Less than 300 K
3. More than 373 K
4. Equal to 373 K
Subtopic: Group 16 - Preparation, Properties & Uses |
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