CBSE Questions for Class 11 Medical Chemistry Equilibrium Quiz 2 - MCQExams.com

Acids when dissolved in ___________ dissociates into ions.
  • juice
  • water
  • kerosene
  • liquid

The formula of hydroxyl ion is:
  • $$OH^+$$
  • $$OH^-$$
  • $$H^+$$
  • none of the above
Acids are bitter in taste.
  • True
  • False
X is a colourless gas with a distinct odour which consist of nitrogen and hydrogen atoms. It is produced naturally in the human body and in nature. Which gas is it? Is it acidic or basic in nature?
  • Ammonia, Acidic
  • Hydrogen Chloride, Acidic
  • Ammonia, Basic
  • Hydrogen Chloride, Basic
Nitric acid is acidic in nature.
  • True
  • False
Curd contains tartaric acid.
  • True
  • False
Toothpaste, bleach, cleaning agents, all are acidic in nature.
  • True
  • False
Statement A: Tamarind contains tartaric acid
Statement B-  Vinegar contains acetic acid
Choose the correct option:
  • Statement A is correct and Statement B is incorrect.
  • Both Statement A and Statement B are incorrect.
  • Statement A is incorrect and Statement B is correct.
  • Both Statement A and B are correct.
Litmus and turmeric are synthetic indicators.
  • True
  • False
Sodium hydroxide is acidic in nature.
  • True
  • False
Which of the following mixtures in aqueous solution of equimolar concentration acts as a buffer solution?
  • $$H NO_{3} + Na OH$$
  • $$H_{2}SO_{4} + K OH$$
  • $$NH_{4}OH(excess) + H Cl$$
  • $$CH_{3}COO H + Na OH (excess)$$
$$HCl$$ does not behave as acid in __
  • Water
  • Ammonia
  • Benzene
  • Aqueous NaOH
$$H_{2}O$$ is a:
  • Proton acceptor
  • Proton donor
  • Both proton donor and proton acceptor
  • Neither proton donor, nor proton acceptor
 In aqueous solution, the following mixture acts as buffer :
  • $$H NO_{3} + KN O_{3}$$
  • $$ H_{2}SO_{4} + K_{2}SO_{4}$$
  • $$NH_{4}OH + NH_{4}Cl$$
  • $$CH_{3}COO H+ Na Cl$$
The mixed solution of pthallic acid and potassium hydrogen pthallate is _________.
  • Basic buffer
  • Acid buffer
  • Not a buffer
  • An acid
 The ionic product of water changes when:
  • an acid is added to it
  • a base is added to it
  • either a base or an acid is added to it
  • the temperature is changed
 Which can act as buffer?
  • $$NH_{4}Cl + H Cl$$
  • $$CH_{3}COO H+H_{2}CO_{3}$$
  • 40 ml of 0.1 M $$NaCN$$+20 ml of 0.1 M $$HCN$$
  • $$NaCl$$+$$NaOH$$
 Acid buffer can be prepared by mixing solutions of:
  • $$Na Cl + Na OH$$
  • $$ H_{2}SO_{4} + Na_{2}SO_{4}$$
  • $$ NH_{4}OH + NH_{4}Cl$$
  • $$ CH_{3} COO Na + CH_{3}COO H$$
What will happen when $$CH_{3}COO Na$$ is added to an aqueous solution of $$CH_{3}COO H$$?
  • the pH of the solution decreases
  • the pH of the solution increases
  • the pH of the solution remains unaltered
  • an acidic salt is produced
Which of the following statements is true about buffer solution?
  • It keeps the pH value constant in a chemical reaction.
  • It decreases the pH value in a chemical reaction.
  • It increases the pH value in a chemical reaction.
  • It first increases and then decreases the pH value in a chemical reaction.
 Which of the following is a buffer solution?
  • $$Na OH +CH_{3}COO Na$$
  • $$Na OH+Na_{2}SO_{4}$$
  • $$K_{2}SO_{4} + H_{2}SO_{4}$$
  • $$NH_{4}OH+NH_{4}Cl$$
A solution which maintains constant pH when small amounts of acid or alkali are added is known as ____.
  • Indicator
  • Buffer
  • Amphoteric
  • Neutral
The solution that is made by mixing appropriate amounts of a weak acid and its salt of strong base is called ________.
  • acidic buffer
  • basic buffer
  • neutral buffer
  • universal indicator
The solutions which tend to keep the concentration of hydrogen ions constant, even when small amounts of strong acid or strong base are added to them, are known as:
  • isohydric solutions
  • buffer solutions
  • isotonic solutions
  • neutral solutions
Match List-1 with List-2.

 List -1            List-2
 A) Aq. Solution of NaCl          1)Acidic buffer
 B) Aq. Solution of $$CH_3COONa$$   2)Acidic solution
 C) Aq. Solution of $$NH_{4}Cl$$      3) Basic solution
 D) Aq. Solution of $$CH_{3}COOH$$ along with $$CH_{3}COONa$$ 4)Neutral solution
                                                    
  • $$A-1; B-2 ; C-3; D-4$$
  • $$A-4 ; B-3; C-2; D-1$$
  • $$A-3; B- 4; C-2; D-1$$
  • $$A-4; B-3; C-1; C-2$$
Which of the following solution cannot act as a buffer?
  • $$Na H_{2}PO_{4} + H_{3}PO_{4}$$
  • $$CH_{3}COO H+CH_{3}COO Na$$
  • $$H Cl + NH_{4}Cl$$
  • $$ H_{3}PO_{4} + Na_{2} H PO_{4}$$
Which of the following mixtures in aqueous solution acts as a buffer?
  • $$H NO_{3} + K NO_{3}$$
  • $$ H_{2}SO_{4} + K_{2}SO_{4}$$
  • $$ NH_{4}OH + NH_{4}Cl$$
  • $$CH_{3}COO H + Na Cl$$
Buffer solution can be obtained by mixing aqueous solution of _______.
  • Sodium acetate and excess of HCl
  • Sodium acetate and acetic acid
  • Sodium chloride and HCl
  • Acetic acid and excess of NaOH
 Which of the following solutions can act as buffer? 
  • $$0.1$$ molar aq. $$NaCl$$
  • $$0.1$$ molar aq.$$CH_{3}COOH + 0.1$$ molar $$NaOH$$
  • $$0.1$$ molar aq. ammonium acetate
  • $$0.1$$ molar $$H_{3}PO_{4}$$
Which of the following will suppress the ionization of acetic acid in aqueous solution?
  • $$NaCl$$
  • $$HCl$$
  • $$KCl$$
  • Unpredictable
Purification of $$NaCl$$ by the passage of $$HCl$$ through brine solution is based on which of the following?
  • Distribution coefficient
  • Le Chatelier’s principle
  • Displacement Law
  • Common ion effect
At $$80^{\circ} C$$, distilled water has hydronium ion$$ \left (H_{3}O^{+} \right )$$ concentration equal to $$1\times 10^{-6} mol/l$$. The value of $$K_w$$ at this temperature would be:
  • $$1\times 10^{-6}$$
  • $$1\times 10^{-12}$$
  • $$1\times 10^{-9}$$
  • $$1\times 10^{-14}$$
 Which of the following pairs will show common ion effect?
  • $$NaC N + K C N$$
  • $$Na Cl + H Cl$$
  • $$NH_{4} OH + NH_{4} Cl $$
  • $$Ba Cl_{2}+ Ba\left ( NO_{3} \right )_{2}$$
At $$90^{\circ}C$$ for pure water, $$[H_{3}O^{+}] =10^{-6.5}$$ mol/litre. The value of $$K_{w}$$ at this temperature is:
  • $$10^{-6}$$
  • $$10^{-13}$$
  • $$10^{-14}$$
  • $$10^{-8}$$
In the third group of qualitative analysis, the precipitating reagent is $$NH_{4}Cl + NH_{4} OH$$. The function of $$NH_{4}Cl$$ is to_______
  • increase the ionization of $$NH_{4} OH$$
  • suppress the ionization of $$NH_{4} OH$$
  • stabilise the hydroxides of group cations
  • convert the ions of group third into their respective chlorides
Buffer solution is prepared by mixing:
  • Strong acid + its salt of strong base
  • Weak acid + its salt of strong base.
  • Strong acid + its salt of weak base
  • None of the above
The addition of $$HCl$$ will not supress the ionization of ________.
  • $$CH_{3}COOH$$
  • $$H_{2}S$$
  • $$C_6H_5COOH$$
  • $$H_{2}SO_{4}$$
 The strength of acid is highest in:
  • $$p K_{a}=6 $$
  • $$p K_{a}=5 $$
  • $$p K_{a}=10 $$
  • $$p K_{a}= 1 $$
5.6 grams of KOH $$(M. wt = 56)$$ is present in 1 litre of solution. Its pH is:
  • 1
  • 13
  • 14
  • 0
The number of $$H^{+}$$ ions in $$1\ cc$$ of a solution of $$pH=13$$ is:
  • $$6.023\times 10^{7}$$
  • $$1\times 10^{-13}$$
  • $$6.023\times 10^{13}$$
  • $$1\times 10^{16}$$
The $$pH$$ of a mono-acidic base is 12.The molarity of the base is:
  • 0.02 moles/litre
  • 0.05 moles/litre
  • 0.5 moles/litre
  • 0.2 moles/litre
Identify the acid which can give acidic salt and base which can give basic salt.
  • $$H_{2} SO _{4} ,  \ Ca(OH)_{2}$$
  • $$Ba(OH)_{2}, \ HCl$$
  • $$H_{2} CO_{3} , \ Al(OH)_{3}$$
  • $$CH_{3}COOH, \ Mg(OH)_{2}$$
 8 gram of NaOH is mixed with 9.8 gram of $$H_{2}SO_{4}$$, the pH of the solution is:
  • more than 7
  • 7
  • less than 7
  • cant be said
The solubility of $$AgCl$$ in $$NaCl$$ solution is less than that in pure water, because of the  ________.
  • solubility product of $$AgCl$$ is less than of $$NaCl$$
  • common ion effect
  • both $$A$$ and $$B$$
  • none of these
A weak mono acidic base is $$0.5$$% ionized in $$0.01 M$$ solution. The hydroxide ion concentration in the solution is:
  • $$5 \times 10^{-2}$$
  • $$5 \times 10^{-5}$$
  • $$5 \times 10^{-10}$$
  • $$2 \times 10^{-11}$$
$$pH$$ of a solution produced when aqueous solution of $$pH=6$$ is mixed with an equal volume of an aqueous solution of $$pH=3$$ is about:
  • $$4.3$$
  • $$3.3$$
  • $$4.0$$
  • $$4.5$$
When ammonium chloride is added to ammonia solution, the pH of the resulting solution will be:
  • increased
  • seven
  • decreased
  • not changed
 Amongst the following hydroxides, the one which has the highest value of $$K_{sp}$$ at $$25^{\circ}$$ $$C$$ is:
  • $$KOH$$
  • $$CsOH$$
  • $$LiOH$$
  • $$RbOH$$
The $$pH$$ of a solution obtained by mixing $$50\: ml$$ of $$0.4N$$ $$HCl$$ and $$50\: ml$$ of $$0.2 N$$ $$NaOH$$ is:
  • $$- log\ 2$$
  • $$-log\  (0.2)$$
  • $$1.0$$
  • $$2.0$$
Solubility of $$AgCl$$ will be minimum in ___________.
  • 0.01 M $$Na_{2} SO_{4}$$
  • 0.01 M $$Ca Cl_{2}$$
  • Pure water
  • 0.001 M $$Ag NO_{3}$$
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