Q. No.
No S-S bonds are present in?
1. \(S_{2}O_{3}^{2-}\)
2. \(S_{2}O_{4}^{2-}\)
3. \(S_{2}O_{5}^{2-}\)
4. \(S_{2}O_{7}^{2-}\)
What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species?
(1)
(2)
(3)
(4)
According to Molecular Orbital Theory, which of the following statement is incorrect?
1. C2 has no unpaired electrons.
2. In molecule, both the bonds are bonds.
3. is paramagnetic but is diamagnetic.
4. In ion, there is one and two bonds.
Match the ionization processes listed in column I with the changes observed as listed in column II. For this use the codes given below:
| Column I | Column II | ||
| (a) | \(N_2 \rightarrow N^+_2\) | (p) | Bond order increases and magnetic property is changed. |
| (b) | \(O^+_2 \rightarrow O^{2+}_2\) | (q) | Bond order decreases and magnetic property is not changed. |
| (c) | \(B_2 \rightarrow B^+_2\) | (r) | Bond order increases and magnetic property is not changed. |
| (d) | \(NO^- \rightarrow NO\) | (s) | Bond order decreases and magnetic property is changed. |
Note: Here change in magnetic property refers to the change from diamagnetic to paramagnetic
or paramagnetic to diamagnetic.
| a | b | c | d | |
| 1. | s | q | p | r |
| 2. | s | p | q | r |
| 3. | r | q | s | p |
| 4. | p | s | q | r |
Arrange the following molecules from most to least polar.
(1) III>V>II > IV=I
(2) II>IV>III>IV>I
(3) III>II>V>IV>I
(4) V>III>II>IV=I
Which of the following statements is/are correct?
| 1. | \((CH_3)_3 COH\) is less acidic than \((CH_3)_3SiOH\) |
| 2. | Like \(CO\), its analogue \(Si\) is not stable. |
| 3. | In phosgene, \(C-O\) bond length is longer than expected while \(C-Cl\) bond length is shorter. |
| 4. | All of the above. |
The boiling point of is higher than that of because :
(1) The dipole moment of is greater than that of
(2) forms hydrogen bonds.
(3) has higher molecular mass than that of
(4) is more ionic than
Assertion : Compounds of ions having an ionic radius of 116 pm are move covalent in character
than those of ions with almost identical size (114 pm) and the same charge.
Reason : For two ions of the same size and charge, one with an (n-1) electronic configuration
will be more polarizing than a cation with an (n-1) (n-1) electronic configuration.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Given below are two statements:
| Assertion (A): | In tetrahedral hybridisation i.e., in \(sp^3\) hybridisation all p-orbitals are involved and no p-orbital is left for side wise overlapping. |
| Reason (R): | Central atom can not form double bonds in the molecules or species having \(sp^3\) hybridisation. |
Assertion : 
Reason : The molecule is slight bent T-shaped and there is repulsion between lone pairs of electrons.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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