CBSE Questions for Class 11 Medical Chemistry Equilibrium Quiz 1 - MCQExams.com

Which of the following is strongest conjugate base 
  • $${\text{ClO}}_{\text{4}}^{\text{ - }}\,\,$$
  • $${\text{HCO}}_{\text{3}}^{\text{ - }}\,\,\,$$
  • $$\,\,{{\text{P}}^{\text{ - }}}\,\,$$
  • $$\,{\text{HSO}}_{\text{4}}^{\text{ - }}$$
Which of the following combination will act as a buffer?
  • $$NH_{3}+HCl$$ (Molar ratio 1:2 )
  • $$CH_{3}COOH + NaOH$$ (Molar ratio 2:1)
  • $$HCl+NaCl$$ (Molar ratio 1:1)
  • $$NaOH+CH_{3}COOH$$ (Molar ratio 1:1)
Number of buffers can be made by reaction of $$ H_3PO_4 $$ and NaOH  is
  • 3
  • 1
  • 4
  • 2
$$HCOO^- + H_2O \rightleftharpoons HCOOH + OH^-$$ is related:-
  • $$h=\sqrt{K_h}$$
  • $$h=\sqrt{\frac{K_h}{C}}$$
  • $$h=\sqrt{\frac{K_h}{V}}$$
  • $$K_h= \sqrt{hc}$$
Percentage dissociation of a $$0.024 M$$ solution of a weak acid $$HA$$ is: 
($${K_a}=2 \times 10^{-3}$$)
  • $$0.25 \%$$
  • $$ \approx 29 \%$$
  • $$25 \%$$
  • $$ \approx 0.25 \%$$
Which of the following is the correct order of hydrated radii?
  • $$Li^{+}$$ < $$Na^{+} $$<$$K^{+} $$<$$ Rb^{+}$$ < $$Cs^{+}$$
  • $$Rb^{+}$$ < $$Na^{+} $$<$$Li^{+} $$<$$ Cs^{+}$$ < $$K^{+}$$
  • $$Cs^{+}$$ < $$Rb^{+} $$<$$K^{+} $$<$$ Na^{+}$$ < $$Li^{+}$$
  • $$Li^{+}$$ < $$K^{+} $$<$$Na^{+} $$<$$ Rb^{+}$$ < $$Cs^{+}$$
For an acidic indicator has $$K_{a}$$ value of $$10^{-5}$$. The $$\%$$ basic form when $$pH$$ equal to $$5.3$$ is :
[Given $$\log 2=0.3$$]
  • $$33.33$$
  • $$66.66$$
  • $$99$$
  • None of the above
When a strong base $$NaOH$$ is added to the acidic buffer containing $$CH_3COOH+CH_3COONa$$ then which of the following reaction occurs?
  • $$CH_3COOH+NaOH \rightarrow CH_3COONa+H_2O$$
  • $$CH_3COOH+OH^-\rightarrow CH_3COO^-+H_2O$$
  • $$CH_3COONa +NaOH\rightarrow CH_3COO^-+2Na^+OH^-$$
  • Both A and B
Calculate the ratio of solubility of $$AgCl$$ in 0.1 M $$AgNO_3 $$ and in pure water.
Given : $$ K_{sp} (AgCl) = 1.8 \times 10^{-10} $$
  • $$ 1.34 \times 10^{-5} M $$
  • $$ 1.34 \times 10^{-4} M $$
  • $$ 2 \times 10^{-8} M $$
  • $$ 3 \times 10^{-6} M $$
What is the $$pH$$ of a solution of $$0.28\ M$$ acid and $$0.84\ M$$ of its conjugate base if the ionztion constant of acid is $$4\times 10^{-4}$$?
  • $$3.88$$
  • $$3.34$$
  • $$7$$
  • $$10.12$$
Which one of the following pairs will not act as a buffer?
  • $${H_2}C{O_3}$$ and $$N{a_2}C{O_3}$$
  • $$C{H_3}COOH$$ and $$C{H_3}COOK$$
  • $$NaCl{O_4}$$ and $$HCl{O_4}$$
  • $$HCl{O_4}$$ and $$N{H_4}Cl$$
Which will not be precipitated after addition of $${ ({ NH }_{ 4 }) }_{ 2 }{ CO }_{ 3 }$$ in presence of $${ { NH }_{ 4 } }{ Cl }$$ :-
  • Ba
  • Mg
  • Ca
  • Sr
The dissociation of water at $$25^{\circ} C$$ is $$1.9\times 10^{-7}$$ % and the density of water is 1gm/$$cm^{3}$$ the ionization constant of water is:
  • $$3.42\times 10^{-6}$$
  • $$3.42\times 10^{-8}$$
  • $$1.00\times 10^{-14}$$
  • $$2.00\times 10^{-16}$$
At $$25^oC,$$ $$K_b$$ for $$BOH=1.0\times10^{-12}.$$  The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:
  • $$1.0\times10^{-6}M$$
  • $$1 \times10^{-7}M$$
  • $$1.0\times10^{-5}M$$
  • $$2.0\times10^{-6}M$$
When some acid is added to water, the ionic product of water_________
  • Changes with an increase in $$pH$$
  • Changes with a decrease in $$pH$$
  • Remains unchanged.
  • Cannot be predicted
A solution of a salt/ salts in $$HCl$$ when diluted with water turns milky. It indicates the presence of:
  • $$Sn$$ salt
  • $$Bi$$ salt
  • $$Sb$$ salt
  • $$Cu$$ salt
Dissociation of $$H_3PO_3$$ occurs in _______ stages.
  • 1
  • 2
  • 3
  • 4
Select the correct statement (s)
  • All carbonate salts are soluble except carbonate salts of alkali metals and $$\left ( NH_{4} \right )_{2}CO_{3} $$
  • All bicarbonate salts are soluble except $$ NaHCO_{3} $$ which is sparingly soluble
  • All sulphites salts are insoluble except sulphite salts of alkali metals and $$ \left ( NH_{4} \right )_{2}SO_{3} $$
  • All $$ MnO_{4} ^-$$ salts are insoluble
$$(A), (B)$$ and $$(C)$$ are:
1726901_88309f6e88fb4868b2c54f8a42ccd686.png
  • $$Na_3PO_4, NaPO_3, (Mn)_3 (PO_4)_2$$
  • $$Na_2HPO_4, Na_3PO_4, Mn_3 (PO_4)_2$$
  • $$Na_2HPO_4, NaPO_3, Mn(PO_3)_2$$
  • $$NaHPO_4, NaPO_3, NaMnPO_4$$
$$K_a$$ value for the acid $$HA$$ is $$1\times 10^{-6}$$. The value of $$K$$ for $$A^- +H_3O^+ \to HA +H_2O$$ is
  • $$1\times 10^{-6}$$
  • $$1\times 10^{12}$$
  • $$1\times 10^{-12}$$
  • $$1\times 10^{6}$$
The addition of $$HCl$$ will not suppress the ionisation of:
  • Acetic acid
  • Sulphuric acid
  • $${H}_{2}S$$
  • Benzoic acid
Which of the following acid / base pairs act as natural buffers in living systems?
  • $$H_2CO_3 / HCO_3{^-} $$
  • $$ {H_2PO_4} {^-} / HPO_4{^{2-}} $$
  • Histidine+ / histidine
  • All of these
An acidic buffer solution can be prepared by mixing the solutions of:
  • sodium acetate and acetic acid
  • ammonium chloride and ammonium hydroxide
  • sulphuric acid and sodium sulphate
  • sodium chloride and sodium hydroxide
Addition of $${NH}_{4}Cl$$ does not effect the $$pH$$ of solution of $${NH}_{4}OH$$. 
  • True
  • False
  • Ambigous
  • None

A compound which when dissolved in water yields hydroxyl ions as the only negative charged ions is known as:
  • acid
  • base
  • alkali
  • none of the above
The first and second dissociation constants of an acid H$$_{2}$$A are 1.0 x 10$$^{-5}$$ & 5.0 x 10$$^{-10}$$ respectively. The overall dissociation constant of the acid will be:
  • 5.0 x 10$$^{-5}$$
  • 5.0 x 10$$^{15}$$
  • 5.0 x 10$$^{-15}$$
  • 0.2 x 10$$^{5}$$
The minimum volume of water required to dissolve $$0.1$$g lead(II) chloride to get a saturated solution ($$K_{sp}$$ of $$PbCl_2=3.2\times 10^{-8}$$; atomic mass of Pb$$=207u$$) is:
  • $$0.18$$ L
  • $$17.98$$ L
  • $$1.798$$ L
  • $$0.36$$ L
Which of the following salts is the most basic in aqueous solution ?
  • $$FeCl_3$$
  • $$Pb(CH_3COO)_2$$
  • $$Al(CN)_3$$
  • $$CH_3COOK$$
In some solutions, the concentration of $$H_3O^+$$ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as:
  • colloidal solutions
  • buffer solutions
  • true solutions
  • ideal solutions
0.004 M $$\mathrm{N}\mathrm{a}_{2}\mathrm{S}\mathrm{O}_{4}$$ is isotonic with 0.01 M Glucose. Degree of dissociation of  $$\mathrm{N}\mathrm{a}_{2}\mathrm{S}\mathrm{O}_{4}$$  is:
  • 75%
  • 50%
  • 25%
  • 85%
With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).
  • The hypochlorite ion is the strongest conjugate base.
  • The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl.
  • The hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.
  • The hypochlorite ion oxidizes the sulfite ion.
Aqueous solutions of $$HNO_3, KOH, CH_3COOH$$, and $$CH_3COONa$$ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is/ are:
  • $$HNO_3$$ and $$CH_3COOH$$
  • $$KOH$$ and $$CH_3COONa$$
  • $$HNO_3$$ and $$CH_3COONa$$
  • $$CH_3COOH$$ and $$CH_3COONa$$
Which will make basic buffer?
  • $$50mL$$ of $$0.1$$ M $$NaOH+25mL$$ of $$0.1M\,CH_3COOH$$
  • $$100mL$$ of $$0.1$$ M$$CH_3COOH+100mL$$ of $$0.1M\,NaOH$$
  • $$100mL$$ of $$0.1M\,HCl+200mL$$ of $$0.1M\,NH_4OH$$
  • $$100mL$$ of $$0.1M\,HCl+100mL$$ of $$0.1$$M\,NaOH$$
Which one of the following pairs of solution is not an acidic buffer?
  • $$H_2CO_3$$ and $$Na_2CO_3$$
  • $$H_3PO_4$$ and $$Na_3PO_4$$
  • $$HClO_4$$ and $$NaClO_4$$
  • $$CH_2COOH$$ and $$CH_3COONa$$
Which of the following is not a characteristic of equilibrium?
  • Rate is equal in both directions
  • Measurable quantities are constant at equilibrium
  • Equilibrium occurs in reversible condition
  • Equilibrium occurs only in open vessel at constant temperature
At $$90^o C$$, pure water has $$[H^{+}]=10^{-6}M$$. The value of $$K_w$$ at $$90^o C$$ is __________.
  • $$10^{-6}$$
  • $$10^{-8}$$
  • $$10^{-12}$$
  • $$10^{-14}$$
$$10 \% $$ $$NaCl$$ means : $$10$$ gm of NaCl in $$100$$ ml of solution 
  • True
  • False
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct

The formula of hydronium ion is:
  • $$H_2O^+$$
  • $$H_3O^+$$
  • $$OH^-$$
  • none of the above
The ionic product of water is $$10^{-14}$$. What is the $$H^{+}$$ ion concentration in 0.1 M NaOH solution?
  • $$10^{-14}M$$
  • $$10^{-1}M$$
  • $$10^{-2}M$$
  • $$10^{-13}M$$
Use of a mild base like _____on the stung area gives relief.
  • Washing soda
  • Milk of magnesia
  • Baking soda
  • Calcium carbonate
The addition of NaCl to AgCl decreases the solubility of AgCl because ________.
  • solubility product decreases
  • solubility product remains constant
  • solution becomes unsaturated
  • solution becomes super saturated
Common salt containing small amount of sodium iodide, is called iodised salt.
  • True
  • False
 Buffer Solution is prepared by mixing _________________.
  • Weak acid and its salt of strong base
  • Strong acid + its salt of strong base
  • Weak acid + its salt of weak base
  • Strong base + its salts of strong acid
If HCl is added to pure water at $$25^{0}$$ C the ionic product of water will be:
  • $$> 10^{-14}$$
  • $$< 10^{-14}$$
  • $$10^{-14}$$
  • $$> 10^{-10}$$
The acid present in the body of red ant is ________.
  • formic acid
  • acetic acid
  • nitric acid
  • sulphuric acid

Alkalis when dissolved in _________ dissociates into ions.
  • juice
  • water
  • kerosene
  • liquid
Acids are _______ in taste.
  • sour
  • bitter
  • spicy
  • sweet
$$H_{3}PO_{2}$$ and $$H_{4}P_{2}O_{7}$$ are respectively ____.
  • tribasic and tetrabasic acids
  • dibasic and tetrabasic acids
  • monobasic and tetrabasic acids
  • tribasic and dibasic acids
Acid dissociation constant is:
  • $$pH$$
  • $$pOH$$
  • $$K_a$$
  • conjugate acid
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers