6.2. Equilibrium - II (icon Equilibrium) - Gujarat Board (GSEB) STD 11 Science Chemistry Questions

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M.C.Q (1 Marks)

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Sample Questions

6.2. Equilibrium - II (icon Equilibrium) questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

Amongst the given options which of the following molecules/ ion acts as a Lewis acid?

A
$OH ^{-}$
B
$NH _3$
C
$H _2 O$
✓
$BF _3$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

The $pH$ of the solution containing $50\, mL$ each of $0.10\, M$ sodium acetate and $0.01\, M$ acetic acid is $.......$

[Given $pK _{ a }$ of $CH _{3} COOH =4.57$ ]

A
$3.57$
B
$4.57$
C
$2.57$
✓
$5.57$

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark

The $\mathrm{p} \mathrm{K}_{\mathrm{b}}$ of dimethylamine and $\mathrm{pK}_{\mathrm{a}}$ of acetic acid are $3.27$ and $4.77$ respectively at $\mathrm{T}(\mathrm{K})$. The correct option for the $pH$ of dimethylammonium acetate solution is :

A
$8.50$
B
$5.50$
✓
$7.75$
D
$6.25$

Answer: C.

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Q 4M.C.Q (1 Marks)1 Mark

Find out the solubility of $Ni ( OH )_{2}$ in $0.1 M NaOH.$

Given that the lonic product of $Ni ( OH )_{2}$ is $2 \times 10^{-15}$

A
$1 \times 10^{8} \,M$
✓
$2 \times 10^{-13}\, M$
C
$2 \times 10^{-8}\, M$
D
$1 \times 10^{-13}\, M$

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark

The solubility product for a salt of the type $AB$ is $4 \times 10^{-8}$. What is the molarity of its standard solution?

A
$4 \times 10^{-4} \;mol / L$
✓
$2 \times 10^{-4} \;mol / L$
C
$16 \times 10^{-16} \;mol / L$
D
$2 \times 10^{-16} \;mol / L$

Answer: B.

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