PrepBharat

1.Why are strong acids generally used as standard solutions in acid-base titrations?
a) The pH at the equivalent point will always be 7
b) They can be used to titrate both strong and weak bases
c) Strong acids form more stable solutions than weak acids
d) The salts of strong acid do not hydrolyse

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2. At a certain temperature the dissociation constants of formic acid and acetic acid are \[1.8\times 10^{-4}\]   and \[1.8\times 10^{-6}\]   respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to
a) 0.001 M
b) 0.01 M
c) 0.1 M
d) 0.0001 M

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3. A compound having the formula \[NH_{2}CH_{2}COOH\]    may behave
a) only as an acid
b) only as a base
c) both as an acid and base
d) Neither acid nor base

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4. Water is a
a) protophobic solvent
b) protophilic solvent
c) amphiprotic solvent
d) aprotic solvent

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5. To \[Ag_{2}CrO_{4}\]   solution over its own precipitate, \[CrO_4^{2-}\] ions are added. This results in
a) increase in \[Ag^{+}\] concentration
b) decrease in \[Ag^{+}\] concentration
c) increase in solubility product
d) shifting of \[Ag^{+}\] ions from the precipitate into the solution

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6. To suppress the dissociation of acetic acid, the compound to be added to it is
a) sodium oxalate
b) sodium acetate
c) sodium carbonate
d) sodium nitrate

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7. Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution
a) \[NH_{4}Cl\]
b) \[Al_{2}\left(SO_{4}\right)_{3}\]
c) \[AgNO_{3}\]
d) NaCN

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8. Why only \[As^{+3}\] gets precipitated as \[As_{2}S_{3}\]  and not \[Zn^{+2}\] as ZnS when \[H_{2}S\]  is passed throgh an acidic solution containing \[As^{+3}\] and \[Zn^{+2}\] ?
a) Solubility product of \[As_{2}S_{3}\]  is less than that of ZnS
b) Enough \[As^{+3}\] are present in acidic medium
c) Zinc salt does not ionise in acidic medium
d) Solubility product changes in presence of an acid

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9. The precipitation occurs if ionic concentration is
a) less than solubility product
b) more than solubility product
c) equal to solubility product
d) None of these

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10. The solubility of AgCl will be minimum in
a) 0.001 M \[AgNO_{3}\]
b) pure water
c) \[0.01 M CaCl_{2}\]
d) 0.01 M NaCl

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