PrepBharat

1. Which of the following is strongest Lewis base?
a) \[CH_3^-\]
b) \[NH_2^-\]
c) \[OH^-\]
d) \[F^-\]

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2. Aluminium chloride is
a) Bronsted Lowry acid
b) Arrhenius acid
c) Lewis acid
d) Lewis base

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3. \[BF_{3}\] is an acid according to
a) Arrhenius concept
b) Bronsted-Lowry concept
c) Lewis Concept
d) Both (b) and (c)

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4. Which of the following is not a Lewis acid?
a) CO
b) \[SiCl_{4}\]
c) \[SO_{3}\]
d) \[Zn^{2+}\]

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5. Ammonium ion is
a) a conjugate acid
b) a conjugate base
c) both an acid and a base
d) neither an acid nor a base

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Answer: a
Explanation:

6. Among the following, the weakest base is
a) \[H^{-}\]
b) \[CH_3^-\]
c) \[CH_{3}O^{-}\]
d) \[Cl^{-}\]

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7.In the equation \[I_2 + I^{-} \rightarrow I_{3}^{-}\]  , which is the Lewis base?
a) \[I_2\]
b) \[I^{-}\]
c) \[I_{3}^{-}\]
d) None of these

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8.Which one of the following compounds is not a protonic acid
a) \[PO\left(OH\right)_3\]
b) \[SO\left(OH\right)_2\]
c) \[SO_2\left(OH\right)_2\]
d) \[B\left(OH\right)_3\]

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9. Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition?
a) \[2NH_3 + H_2SO_4\rightleftharpoons 2NH_4^+ + SO_4^{2-}\]
b) \[NH_3 + CH_3 COOH \rightleftharpoons NH_4^+ + CH_3 COO^-\]
c) \[H_2 O+ CH_3 COOH \rightleftharpoons H_3 O^+ + CH_3 COO^-\]
d) \[\left[Cu\left(H_2 O\right)_4\right]^{2-}+ 4NH_3 \rightleftharpoons \left[Cu\left(NH_3 \right)_4\right]^{2+} + 4H_2O \]

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Answer: d
Explanation:

10. Which one of the following is the strongest acid?
a) \[ ClO_3 OH\]
b) \[ClO_2\left( OH\right)\]
c) \[SO\left( OH\right)_2\]
d) \[SO_2\left( OH\right)_2\]

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