MCQ 511 Mark
$0.025 M CH _3 COOH$ is dissociated $9.5 \%$. Hence the $pH$ of the solution is
- ✓
$2.6244$
- B
$3.128$
- C
$2.988$
- D
$2.267$
AnswerCorrect option: A. $2.6244$
View full question & answer→MCQ 521 Mark
The solubility product of $PbS$ in $4.2 \times 10^{-28}$ at $300 K$. The sulphide ions concentration required to precipitate $PbS$ from a solution containing $0.001 M$ of lead ion is
- A
$\geq 2.1 \times 10^{-14} mol / dm ^3$
- B
$\geq 4.2 \times 10^{-14} mol / dm ^3$
- ✓
$\geq 4.2 \times 10^{-25} mol / dm ^3$
- D
$\leq 4.2 \times 10^{-28} mol / dm ^3$
AnswerCorrect option: C. $\geq 4.2 \times 10^{-25} mol / dm ^3$
View full question & answer→MCQ 531 Mark
The solubility product of $Fe ( OH )_3$ is
- A
$[$ latex $] \backslash$ mathrm\{F\}_\{mathrm\{e\}\}^\{2+\}[/latex] $\left[ OH ^{-}\right]^3$
- B
$[$ latex $] \backslash$ mathrm $\{ F \} \_\left\{\text {mathrm\{e\}\}^\{\{3+\}[/latex] }\left[ OH ^{-}\right]^2\right.$
- ✓
$\left[\right.$ latex]\mathrm\{F\}_\{\mathrm\{e\}\}^\{3+\}[/latex] $\left[ OH ^{-}\right]^3$
- D
$[$ latex $] \backslash$ mathrm\{F\}_\{\mathrm\{e\}\}^\{3+\}[/latex $]^3\left[ OH ^{-}\right]^3$
AnswerCorrect option: C. $\left[\right.$ latex]\mathrm\{F\}_\{\mathrm\{e\}\}^\{3+\}[/latex] $\left[ OH ^{-}\right]^3$
$\left[\right.$ latex]\mathrm\{F\}_\{\mathrm\{e\}\}^\{3+\}[/latex] $\left[ OH ^{-}\right]^3$
View full question & answer→MCQ 541 Mark
A solution becomes unsaturated when
AnswerCorrect option: B. ionic product < solubility product
ionic product < solubility product
View full question & answer→MCQ 551 Mark
Among the following hydroxides, the one which has the lowest value of solubility product at temperature $298 K$ is,
- A
$Mg ( OH )_2$
- B
$Ca ( OH )_2$
- C
$Ba ( OH )_2$
- ✓
$Be ( OH )_2$
AnswerCorrect option: D. $Be ( OH )_2$
View full question & answer→MCQ 561 Mark
The solubility product of a salt $BA$ at room temperature is $1.21 \times 10^{-6}$. Its molar solubility is
- A
$1.21 \times 10^{-3} M$
- B
$1.1 \times 10^{-4} M$
- ✓
$1.1 \times 10^{-3} M$
- D
$1.21 \times 10^{-2} M$
AnswerCorrect option: C. $1.1 \times 10^{-3} M$
View full question & answer→MCQ 571 Mark
The correct representation for solubility product of $SnS 2$ is
- ✓
$\left[ Sn ^{4+}\right]\left[ S ^{2-}\right]^2$
- B
$\left[ Sn ^{4+}\right]\left[ S ^{2-}\right]$
- C
$\left[ Sn ^{4+}\right]\left[2 S ^{2-}\right]$
- D
$\left[S n^{4+}\right]\left[2 S^{2-}\right]$
AnswerCorrect option: A. $\left[ Sn ^{4+}\right]\left[ S ^{2-}\right]^2$
View full question & answer→MCQ 581 Mark
The ion that cannot be precipitated by both $HCl$ and $H 2 S$ is
- A
$Pb ^{2+}$
- B
$Cu ^{2+}$
- C
$Ag ^{+}$
- ✓
$Ca ^{2+}$
AnswerCorrect option: D. $Ca ^{2+}$
View full question & answer→MCQ 591 Mark
The common ion effect is based on
MCQ 601 Mark
If molarity of $NaOH$ is $3.162 \times 10^{-3} M$, its $pH$ is
- A
$8.5$
- B
$9.5$
- C
$10.5$
- ✓
$11.5$
AnswerCorrect option: D. $11.5$
View full question & answer→MCQ 611 Mark
The pH of human blood in a normal person is approximately
- A
$4.7$
- B
$6.04$
- ✓
$7.40$
- D
$8.74$
AnswerCorrect option: C. $7.40$
View full question & answer→MCQ 621 Mark
The pH of a solution is $5$, when the hydroxyl ion concentration is
- A
$10^{-5} mol / dm ^3$
- B
$10^{-7} mol / dm ^3$
- ✓
$10^{-9} mol / dm ^3$
- D
$10^{-14} mol / dm ^3$
AnswerCorrect option: C. $10^{-9} mol / dm ^3$
View full question & answer→MCQ 631 Mark
If the $pH$ value of a solution is zero, the solution is
View full question & answer→MCQ 641 Mark
If the $H ^{+}$ion concentration in a solution is $0.01 M$, the $pOH$ of the solution is
View full question & answer→MCQ 651 Mark
$100 ml$ of $0.01 M$ solution of $NaOH$ is diluted to $1 dm ^3$. What is the $pH$ of the dilute solution?
View full question & answer→MCQ 661 Mark
The $pH$ of a $0.63 \%$ nitric acid solution is (Equivalent weight of nitric acid is 63 )
View full question & answer→MCQ 671 Mark
The $pH$ of $0.05 M$ solution of dibasic acid is
View full question & answer→MCQ 681 Mark
$pH$ of blood is maintained constant by mechanism of
View full question & answer→MCQ 691 Mark
$pH$ of a solution is $13 . H ^{+}$ions present in $1 cm ^3$ of the solution is
- A
$6.023 \times 10^{10}$
- B
$6.023 \times 10^7$
- C
$6.023 \times 10^{-10}$
- ✓
$6.023 \times 10^{-7}$
AnswerCorrect option: D. $6.023 \times 10^{-7}$
View full question & answer→MCQ 701 Mark
- ✓
$pH$ increases
- B
$pH$ decreases
- C
- D
can vary depending on an acid
AnswerCorrect option: A. $pH$ increases
View full question & answer→MCQ 711 Mark
The $POH$ value for solution is $4$ , its hydrogen ion concentration will be
- A
$10^{-4}$
- ✓
$10^{-10}$
- C
$10^{10}$
- D
$10^{4}$
AnswerCorrect option: B. $10^{-10}$
View full question & answer→MCQ 721 Mark
The number of moles of hydroxide ions $\left( OH ^{-}\right)$produced from 2 moles of $Na _2 CO _3$ is
View full question & answer→MCQ 731 Mark
An aqueous solution of which of the following salts is basic ?
- ✓
$CH _3 COONa$
- B
$NH _4 Cl$
- C
$KNO _3$
- D
$CuSO _4$
AnswerCorrect option: A. $CH _3 COONa$
View full question & answer→MCQ 741 Mark
An aqueous solution of magnesium chloride changes blue litmus red due to
- A
the formation of $Cl ^{-}$ions
- B
the formation $Mg ^{2+}$ ions
- C
reaction of $Cl ^{-}$ions with water
- ✓
View full question & answer→MCQ 751 Mark
Which of the following salts does not hydrolyse in water ?
MCQ 761 Mark
What is the nature of the solution of salt $FeCl _3$ ?
View full question & answer→MCQ 771 Mark
A solution of blue vitriol is acidic in nature because
- ✓
$CuSO _4$ reacts with water
- B
$Cu ^{2+}$ ions reacts with water
- C
$SO _4{ }^{2-}$ ions reacts with water
- D
$CuSO _4$ removes $OH ^{-}$ions from water
AnswerCorrect option: A. $CuSO _4$ reacts with water
View full question & answer→MCQ 781 Mark
Which of the following salt, when dissolved in water will hydrolyse ?
- A
$NaCl$
- ✓
$NH _4 Cl$
- C
$KCl$
- D
$Na _2 SO _4$
AnswerCorrect option: B. $NH _4 Cl$
View full question & answer→MCQ 791 Mark
The addition of solid sodium carbonate to pure water results in
AnswerCorrect option: B. an increase in $pH$
View full question & answer→MCQ 801 Mark
If ' $S$ ' is solubility in mol $dm ^{-3}$ and $K_{\text {sp }}$ is solubility product of $B A_2$ type of salt, then relation between them is
- A
$S=\sqrt{K_{ sp }}$
- B
$K _{ sp }=4 S^3$
- C
$K_{s p}=S^3$
- D
$S=K_{s p}$
View full question & answer→MCQ 811 Mark
The relationship between the solubility and solubility product for silver carbonate is
- A
$K _{ sp }= s ^2$
- B
$\sqrt{K_{ sp }}=4 s ^2$
- C
$K_{s p}=27 S^4$
- ✓
$K _{ sp }=4 s ^3$
AnswerCorrect option: D. $K _{ sp }=4 s ^3$
View full question & answer→MCQ 821 Mark
Which of the following metal sulphide is precipitated in an acidic medium ?
MCQ 831 Mark
If the hydrogen ion concentration of an acid is decreased ten times, its pH will be
MCQ 841 Mark
The gastric juice in our stomach contains enough hydrochloric acid to make the hydrogen ion concentration $0.01 mol / dm ^3$. The $pH$ of gastric juice is-
View full question & answer→MCQ 851 Mark
$10 ml$ of $0.1 M H _2 SO _4$ is mixed with $20 ml$ of $0.1 M KOH$, the $pH$ of resulting solution will be
View full question & answer→MCQ 861 Mark
Which of the following solution with same concentration will have highest $pH$
- A
$Al ( OH )_3$
- B
$K _2 CO _3$
- C
$NH _4 OH$
- ✓
$NaOH$
AnswerCorrect option: D. $NaOH$
View full question & answer→MCQ 871 Mark
The $\left[ H ^{+}\right]$for a weak acid of dissociation constant $K _{ a }$ and concentration $C$ is nearly equal to
AnswerCorrect option: B. $\sqrt{K_{ a } C}$
View full question & answer→MCQ 881 Mark
The $\left[ OH ^{-}\right]$for a weak base of dissociation constant $K _{ b }$ and concentration $C$ is nearly equal to
AnswerCorrect option: C. $\sqrt{K_{ b } C}$
View full question & answer→MCQ 891 Mark
The ionic product of water will increase, if
- A
- B
$H ^{+}$ions are added
- C
$OH ^{-}$ions are added
- ✓
View full question & answer→MCQ 901 Mark
The degree of dissociation of a $0.1 M$ monobasic acid is $0.4 \%$. Its dissociation constant is
- A
$0.4 \times 10^{-4}$
- B
$4.0 \times 10^{-4}$
- ✓
$1.6 \times 10^{-6}$
- D
$0.8 \times 10^{-5}$
AnswerCorrect option: C. $1.6 \times 10^{-6}$
View full question & answer→MCQ 911 Mark
Ostwald’s dilution law is applicable in case of dilute solution of
- A
$HCl$
- B
$H _2 SO _4$
- C
$NaOH$
- ✓
$CH _3 COOH$
AnswerCorrect option: D. $CH _3 COOH$
View full question & answer→MCQ 921 Mark
The $pH$ of decimolar solution $KOH$ is
View full question & answer→MCQ 931 Mark
If a $0.1 M$ solution of $HCN$ is $0.01 \%$ dissociated, the dissociation constant for $HCN$ is,
- A
$10^{-3}$
- B
$10^{+3}$
- C
$10^{-7}$
- ✓
$10^{-9}$
AnswerCorrect option: D. $10^{-9}$
View full question & answer→MCQ 941 Mark
According to the Lewis theory, an acid is
MCQ 951 Mark
The species which will behave both as a conjugate acid and base is
- A
$NH _4 OH$
- B
$CO _3^{-}$
- ✓
$HSO _4^{-}$
- D
$H _2 SO _4$
AnswerCorrect option: C. $HSO _4^{-}$
View full question & answer→MCQ 961 Mark
According to the Arrhenius theory,
- A
an acid is a proton donor
- B
an acid is an electron pair acceptor
- ✓
a hydrogen ion exists freely in an aqueous solution
- D
a hydrogen ion is always hydrated to form a hydrogen ion
AnswerCorrect option: C. a hydrogen ion exists freely in an aqueous solution
View full question & answer→MCQ 971 Mark
In the following reaction $HC _2 O _{4( aq )}^{-}+ PO _4^{3-} \rightleftharpoons HPO _4^{2-}+ C _2 CO _4^{2-}$ Which of two are Lowry-Bronsted bases ?
- A
$HC _2 C _4^{-}$and $PO _4^{3-}$
- B
$HPO _4^{2-}$ and $C _2 O _4^{2-}$
- C
$HC _2 O _4^{-}$and $HPO _4^{2-}$
- ✓
$PO _4^{3-}$ and $C _2 O _4^{2-}$
AnswerCorrect option: D. $PO _4^{3-}$ and $C _2 O _4^{2-}$
View full question & answer→MCQ 981 Mark
Which of the following molecules is not a Lewis base?
- A
$H _2 O$
- ✓
$BF _3$
- C
$NH _3$
- D
$CO$
AnswerCorrect option: B. $BF _3$
View full question & answer→MCQ 991 Mark
The conjugate acid of $NH _2^{-}$is
- ✓
$NH _3$
- B
$NH _2 OH$
- C
$NH _4^{+}$
- D
$N _2 H _4$
AnswerCorrect option: A. $NH _3$
View full question & answer→MCQ 1001 Mark
Which of the following is a conjugate acid$-$base pair ?
- A
$HCl , NaOH$
- B
$KCN , HCN$
- C
$NH _4 Cl , NH _4 OH$
- ✓
$H _2 SO _4, HSO _4^{-}$
AnswerCorrect option: D. $H _2 SO _4, HSO _4^{-}$
View full question & answer→