PrepBharat

1. Which of the following has zero dipole moment?
a) ClF
b) \[PCI_{3}\]
c) \[SiF_{4}\]
d) \[CFCI_{3}\]

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2. Dipole moment is shown by
a) 1, 4-dichlorobenzene
b) cis 1,2-dichlorobenzene
c) trans 1, 3-dichlorobenzene
d) trans 2, 3-dichloro -2- butene

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Answer: b
Explanation:

3. Which one of the following molecules will have unequal M – F bond lengths ?
a) \[NF_{3}\]
b) \[BF_{3}\]
c) \[PF_{5}\]
d) \[SF_{4}\]

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Answer: c
Explanation:

4. The bond length in LiF will be
a) less than that of NaF
b) equal to that of KF
c) more than that of KF
d) equal to that of NaF

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5. Which has the least bond angle ?
a) \[NH_{3}\]
b) \[BeF_{2}\]
c) \[H_{2}O\]
d) \[CH_{4}\]

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6.The correct sequence of decrease in the bond angles of the following hydrides is
a) \[NH_{3}>PH_{3}>AsH_{3}>SbH_{3}\]
b) \[NH_{3}>AsH_{3}>PH_{3}>SbH_{3}\]
c) \[SbH_{3}>AsH_{3}>PH_{3}>NH_{3}\]
d) \[PH_{3}>NH_{3}>AsH_{3}>SbH_{3}\]

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Answer: a
Explanation:

7. The sulphate of a metal has the formula \[M_{2}\left(SO_{4}\right)_{3}\] The formula of its phosphate will be
a) \[M\left(HPO_{4}\right)_{2}\]
b) \[M_{3}\left(PO_{4}\right)_{2}\]
c) \[M_{2}\left(PO_{4}\right)_{3}\]
d) \[MPO_{4}\]

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8. KF combines with HF to form \[KHF_{2}\]  . The compound contains the species
a) \[K^{+},F^{-}and H^{+}\]
b) \[K^{+},F^{-} and HF\]
c) \[K^{+}, and \left[HF_{2}\right]^{-}\]
d) \[\left[KHF\right]^{+} and F_{2}\]

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9. Which of the following molecular orbitals has two nodal planes ?
a) \[\sigma 2s\]
b) \[\pi2p_{y}\]
c) \[\pi*2p_{y}\]
d) \[\sigma*2p_{x}\]

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Answer: c
Explanation:

10. The electronic configuration of metal M is 1s² 2s² 2p⁶ 3s¹. The formula of its oxide will be
a) MO
b) \[M_{2}O\]
c) \[SO_{3}\]
d) All of these

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