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Published on: 23/08/2019
Acids, Bases and Salts
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Questions + Answers key
Take MCQ Science Test
1.
Which of the following statement is true for acids?
Bitter and change red litmus to blue
Sour and change red litmus to blue
Sour and change blue litmus to red
Bitter and change blue litmus to red
2.
Which of the following is (are) true when HCl (g) is passed through water?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution
(iii) It gives both hydrogen and hydroxyl ion in the solution
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule
(i) only
(iii) only
(ii) and (iv)
(iii) and (iv)
3.
Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?
Red
Yellow
Yellowish green
Blue
4.
Which among the following is not a base?
NaOH
KOH
\(NH_4OH\)
\(CH_2H_5OH\)
5.
The pH of the gastric juices released during digestion is
less than 7
more than 7
equal to 7
equal to 0
6.
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
Wash the hand with saline solution
Wash the hand immediately with plenty of water and apply a paste od sodium hydrogen carbonate
After washing with plenty of water apply solution of solution hydroxide on the hand
Neutralise the acid with a strong alkali
7.
Sodium carbonate is a basic salt because it is a salt of
Strong acid and strong base
weak acid and weak base
strong acid and weak base
weak acid and strong base
8.
10 ml of a solution of NaOH is found to be completely neutralised by 8 ml of a given solution of HCl. If we take 20 ml of the same solution of NaOH, the amount of HCl solution required to neutralise it will be
4 ml
8 ml
12 ml
16 ml
9.
A solution turns red litmus blue; its pH is likely to be?
1
4
5
10
10.
What is the effect of an increase in the concentration of H+ ions? 1M HCl or 1M CH3COOH.
11.
Which is a stronger acid, with pH = 5 or with pH = 2 ?
12.
Which gas is usually liberated when an acid reacts with a metal?
13.
Name the acid present in ant sting.
14.
Dry ammonia gas has no action on litmus paper, but a solution of a ammonia in water turns red litmus paper blue, why is it so?
15.
(a) Give Arrhenius definition of an acid and a base.
(b) Choose strong acid and strong base from the following:
\(CH_3COOH,\ NH_4OH,\ KOH,\ HCl\)
16.
The pH value of three solutions A, B, and C having equal molar concentration are respectively 2.0, 7.0, and 13.0 at 298 K. Which of the three solutions represents an acid solution?
1.
(c)
Sour and change blue litmus to red
2.
(c)
(ii) and (iv)
3.
(c)
Yellowish green
4.
(d)
\(CH_2H_5OH\)
5.
(a)
less than 7
6.
(b)
Wash the hand immediately with plenty of water and apply a paste od sodium hydrogen carbonate
7.
(d)
weak acid and strong base
8.
(d)
16 ml
9.
(d)
10
10.
1 M HCl has a higher concentration of H+ ions because when HCl dissolves in water it dissociates completely into ions while CH3COOH is a weak acid and does not dissociate into ions completely.
11.
pH = 2 (lower the pH, stronger the acid).
12.
Reaction of an acid with a metal:
When an acid reacts with a metal, it forms a salt.
Hydrogen which is in all the acids gets displaced and liberated as hydrogen gas.
Acids + Metals \(\rightarrow\) Salt + Hydrogen gas
13.
Formic acid(Methanoic acid) HCOOH.
14.
A solution of ammonia in water results in the formation of ammonium hydroxide (NH4OH). Ammonium hydroxide is basic in nature and turns red litmus blue.
15.
(a) According to Arrhenius theory, acids are substances that produce H+ ions when mixed with water. On the other hand, based are substances that produce OH- ions when mixed with water.
(b) NH4OH is a weak base and HCl is a strong acid.
16.
A represents an acid solution. This is because the pH value of A is 2.0 and the pH value of an acids lies between 1 and 6.
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