NEET Test Series from KOTA - 10 Papers In MS WORD
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Ionic Equilibrium
230044
A weak acid, HA has a \(\mathrm{K}_{\mathrm{a}}\) of \(1.00 \times 10^{-3}\). If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
1 \(1.00 \%\)
2 \(99.9 \%\)
3 \(0.100 \%\)
4 \(99.0 \%\)
Explanation:
For a weak acid degree of dissociation - \[ \alpha=\sqrt{\frac{\mathrm{K}_{\mathrm{a}}}{\mathrm{C}}}=\sqrt{\frac{1 \times 10^{-5}}{0.1}}=10^{-2}=0.01=1 \% \]
NEET-2007
Ionic Equilibrium
230037
Which one of the following substances has the highest proton affinity?
1 \(\mathrm{H}_2 \mathrm{O}\)
2 \(\mathrm{H}_2 \mathrm{~S}\)
3 \(\mathrm{NH}_3\)
4 \(\mathrm{PH}_3\)
Explanation:
\(\mathrm{NH}_3\) is a Lewis base, accepting proton to form ammonium ion as it has tendency to donate an electron pair.
[AIEEE-2003]
Ionic Equilibrium
230039
Which is not an example of common ion effect?
Among the given, \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}\) has no common ion, thus does not exhibit common ion effect. Common ion effect is the suppression of degree of dissociation of weak electrolyte in the presence of a strong electrolyte having common ion.
MHT CET-2010
Ionic Equilibrium
230045
Which of the following pairs of ions cannot be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute \(\mathrm{HCl}^{+}\)?
1 \(\mathrm{Bi}^{3+}, \mathrm{Sn}^{7+}\)
2 \(\mathrm{Al}^{3+}, \mathrm{Hg}_{2+}^{2+}\)
3 \(\mathrm{Cu}^{2+}, \mathrm{Zn}^2\)
4 \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}\)
Explanation:
\(\mathrm{Bi}^{3+}\) (IIA), \(\mathrm{Sn}^{4+}\) (IIB) can't be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute hydrochloric acid. Both the radicals are precipitated as their sulphides \(\mathrm{Bi}_2 \mathrm{~S}_3\) (Black) and \(\mathrm{SnS}_2\) (yellow)
230044
A weak acid, HA has a \(\mathrm{K}_{\mathrm{a}}\) of \(1.00 \times 10^{-3}\). If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
1 \(1.00 \%\)
2 \(99.9 \%\)
3 \(0.100 \%\)
4 \(99.0 \%\)
Explanation:
For a weak acid degree of dissociation - \[ \alpha=\sqrt{\frac{\mathrm{K}_{\mathrm{a}}}{\mathrm{C}}}=\sqrt{\frac{1 \times 10^{-5}}{0.1}}=10^{-2}=0.01=1 \% \]
NEET-2007
Ionic Equilibrium
230037
Which one of the following substances has the highest proton affinity?
1 \(\mathrm{H}_2 \mathrm{O}\)
2 \(\mathrm{H}_2 \mathrm{~S}\)
3 \(\mathrm{NH}_3\)
4 \(\mathrm{PH}_3\)
Explanation:
\(\mathrm{NH}_3\) is a Lewis base, accepting proton to form ammonium ion as it has tendency to donate an electron pair.
[AIEEE-2003]
Ionic Equilibrium
230039
Which is not an example of common ion effect?
Among the given, \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}\) has no common ion, thus does not exhibit common ion effect. Common ion effect is the suppression of degree of dissociation of weak electrolyte in the presence of a strong electrolyte having common ion.
MHT CET-2010
Ionic Equilibrium
230045
Which of the following pairs of ions cannot be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute \(\mathrm{HCl}^{+}\)?
1 \(\mathrm{Bi}^{3+}, \mathrm{Sn}^{7+}\)
2 \(\mathrm{Al}^{3+}, \mathrm{Hg}_{2+}^{2+}\)
3 \(\mathrm{Cu}^{2+}, \mathrm{Zn}^2\)
4 \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}\)
Explanation:
\(\mathrm{Bi}^{3+}\) (IIA), \(\mathrm{Sn}^{4+}\) (IIB) can't be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute hydrochloric acid. Both the radicals are precipitated as their sulphides \(\mathrm{Bi}_2 \mathrm{~S}_3\) (Black) and \(\mathrm{SnS}_2\) (yellow)
230044
A weak acid, HA has a \(\mathrm{K}_{\mathrm{a}}\) of \(1.00 \times 10^{-3}\). If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
1 \(1.00 \%\)
2 \(99.9 \%\)
3 \(0.100 \%\)
4 \(99.0 \%\)
Explanation:
For a weak acid degree of dissociation - \[ \alpha=\sqrt{\frac{\mathrm{K}_{\mathrm{a}}}{\mathrm{C}}}=\sqrt{\frac{1 \times 10^{-5}}{0.1}}=10^{-2}=0.01=1 \% \]
NEET-2007
Ionic Equilibrium
230037
Which one of the following substances has the highest proton affinity?
1 \(\mathrm{H}_2 \mathrm{O}\)
2 \(\mathrm{H}_2 \mathrm{~S}\)
3 \(\mathrm{NH}_3\)
4 \(\mathrm{PH}_3\)
Explanation:
\(\mathrm{NH}_3\) is a Lewis base, accepting proton to form ammonium ion as it has tendency to donate an electron pair.
[AIEEE-2003]
Ionic Equilibrium
230039
Which is not an example of common ion effect?
Among the given, \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}\) has no common ion, thus does not exhibit common ion effect. Common ion effect is the suppression of degree of dissociation of weak electrolyte in the presence of a strong electrolyte having common ion.
MHT CET-2010
Ionic Equilibrium
230045
Which of the following pairs of ions cannot be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute \(\mathrm{HCl}^{+}\)?
1 \(\mathrm{Bi}^{3+}, \mathrm{Sn}^{7+}\)
2 \(\mathrm{Al}^{3+}, \mathrm{Hg}_{2+}^{2+}\)
3 \(\mathrm{Cu}^{2+}, \mathrm{Zn}^2\)
4 \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}\)
Explanation:
\(\mathrm{Bi}^{3+}\) (IIA), \(\mathrm{Sn}^{4+}\) (IIB) can't be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute hydrochloric acid. Both the radicals are precipitated as their sulphides \(\mathrm{Bi}_2 \mathrm{~S}_3\) (Black) and \(\mathrm{SnS}_2\) (yellow)
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Ionic Equilibrium
230044
A weak acid, HA has a \(\mathrm{K}_{\mathrm{a}}\) of \(1.00 \times 10^{-3}\). If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
1 \(1.00 \%\)
2 \(99.9 \%\)
3 \(0.100 \%\)
4 \(99.0 \%\)
Explanation:
For a weak acid degree of dissociation - \[ \alpha=\sqrt{\frac{\mathrm{K}_{\mathrm{a}}}{\mathrm{C}}}=\sqrt{\frac{1 \times 10^{-5}}{0.1}}=10^{-2}=0.01=1 \% \]
NEET-2007
Ionic Equilibrium
230037
Which one of the following substances has the highest proton affinity?
1 \(\mathrm{H}_2 \mathrm{O}\)
2 \(\mathrm{H}_2 \mathrm{~S}\)
3 \(\mathrm{NH}_3\)
4 \(\mathrm{PH}_3\)
Explanation:
\(\mathrm{NH}_3\) is a Lewis base, accepting proton to form ammonium ion as it has tendency to donate an electron pair.
[AIEEE-2003]
Ionic Equilibrium
230039
Which is not an example of common ion effect?
Among the given, \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}\) has no common ion, thus does not exhibit common ion effect. Common ion effect is the suppression of degree of dissociation of weak electrolyte in the presence of a strong electrolyte having common ion.
MHT CET-2010
Ionic Equilibrium
230045
Which of the following pairs of ions cannot be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute \(\mathrm{HCl}^{+}\)?
1 \(\mathrm{Bi}^{3+}, \mathrm{Sn}^{7+}\)
2 \(\mathrm{Al}^{3+}, \mathrm{Hg}_{2+}^{2+}\)
3 \(\mathrm{Cu}^{2+}, \mathrm{Zn}^2\)
4 \(\mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}\)
Explanation:
\(\mathrm{Bi}^{3+}\) (IIA), \(\mathrm{Sn}^{4+}\) (IIB) can't be separated by \(\mathrm{H}_2 \mathrm{~S}\) in dilute hydrochloric acid. Both the radicals are precipitated as their sulphides \(\mathrm{Bi}_2 \mathrm{~S}_3\) (Black) and \(\mathrm{SnS}_2\) (yellow)