Acids, Bases And Salts Test

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Acids, Bases And Salts Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

There are two test tubes - A and B. Test tube A contains dilute hydrochloric acid and test tube B contains dilute sodium hydroxide. The two samples are tested with various indicators. Which of the following statements is true?

A
The solution in test tube A gives pink colour with phenolphthalein, but the solution in test tube B is colourless.

B
When clove oil is added to the sample, test tube B does not smell of clove oil.

C
Solutions in test tubes A and B both give green colour with universal indicator.

D
Solution in test tube A gives yellow colour with methyl orange, while solution in test tube B gives pink colour.

Solution

Clove oil is an olfactory indicator and it loses its odour with bases, but retains it with acids.

The other options are wrong because of the following reasons:
(1) Phenolphthalein is colourless with acids (test tube A) and pink with bases (test tube B).
(3) With the universal indicator, the acid in test tube A will turn red and the base in test tube B will turn blue.
(4) Methyl orange gives pink colour with acids (test tube A) and blue colour with bases (test tube B).
Question 2
1 / -0

A Lewis acid is usually an electron deficient species which can accept a pair of electrons and form a coordinate bond. The Lewis acid among the following is

A
BF₃

B
NH₃

C
PH₃

D
H₂O

Solution

BF₃ is electron deficient as its octet is not complete. Hence, it is a Lewis acid.
Question 3
1 / -0

NH₃ has a lone pair of electrons on nitrogen and hence, it can be categorised as a/an

A
Arrhenius base

B
Arrhenius acid

C
Lewis base

D
Lewis acid

Solution

A Lewis base is an electron rich species, which may be negatively charged or electron rich due to the presence of a lone pair of electrons. For example: NH₃.
Question 4
1 / -0

The effervescence produced on the addition of a metal to an aqueous solution of hydrogen carbonate is due to the evolution of

A
H₂

B
CO

C
CO₂

D
O₂

Solution

Metal + Hydrogen carbonate → Salt + Carbon dioxide + Water
Question 5
1 / -0

The reaction of zinc granules with aqueous NaOH produces

A
Na(Zn)₂OH

B
NaZnO₂ + H₂

C
Na₂ZnO₂ + H₂

D
Na + Zn(OH)₂

Solution

Zinc reacts with NaOH to produce a soluble complex sodium zincate and hydrogen gas.

Zn + 2NaOH →Na₂ZnO₂ + H₂
Question 6
1 / -0

If a few drops of a concentrated acid accidentally spill over the hand of a student, what should he do?

A
Wash the hand with saline water

B
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

C
After washing with plenty of water, apply the solution of sodium hydroxide to the hand

D
Neutralise the acid with a strong alkali

Solution

The harmful effect of an acid can be neutralised by a base, however, the base used should be mild, because a strong alkali, like NaOH, can be highly corrosive on the skin.
Question 7
1 / -0

Which among the following has the greatest concentration of H⁺ ions?

A
1 mol L^-1 HCl solution

B
1 mol L^-1 H₃PO₂ solution

C
1 mol L^-1 H₂SO₄ solution

D
1 mol L^-1 H₂CO₃ solution

Solution

Concentrations of all the solutions are equal, and HCl and H₃PO₂ are monobasic. Both H₂CO₃ and H₂SO₄ are dibasic, but H₂CO₃is a weak acid, whereas H₂SO₄ is a strong acid. Therefore, due to double dissociation of H₂SO₄, it will give the greatest concentration of H⁺ions.
Question 8
1 / -0

Which of the following pairs of compounds cannot co-exist in water?

A
NaHCO₃ and Na₂CO₃

B
Na₂CO₃ and NaOH

C
NaHCO₃ and NaOH

D
NaHCO₃ and NaCl

Solution

Sodium bicarbonate is an acidic salt and it will react with NaOH (base) as follows:

NaHCO₃ (aq) + NaOH (aq) →Na₂CO₃ (aq) + H₂O (l)
Question 9
1 / -0

The pH of 10^-6M KOH is

A
6

B
0.6

C
8

D
0.8

Solution

pOH of 10^-6M solution of KOH = -log 10^-6 = 6
Therefore, pH = 14 - 6 = 8.
Moreover, KOH is a base and will have pH > 7.
Question 10
1 / -0

Which of the following solutions has the lowest pH value?

A
0.1 Molar NaCl solution

B
0.01 Molar NaHCO₃ solution

C
0.001 Molar Na₂CO₃ solution

D
0.01 Molar NaOH solution

Solution

NaHCO₃ is an acidic salt and its solution will have pH < 7.
NaCl is a neutral salt and its solution will have pH = 7.
Na₂CO₃ is a basic salt and its solution will have pH > 7.
NaOH is a base and its solution will have pH > 7.

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Acids, Bases And Salts Test - 2

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Acids, Bases And Salts Test - 2

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Question 1

The solution in test tube A gives pink colour with phenolphthalein, but the solution in test tube B is colourless.

When clove oil is added to the sample, test tube B does not smell of clove oil.

Solutions in test tubes A and B both give green colour with universal indicator.

Solution in test tube A gives yellow colour with methyl orange, while solution in test tube B gives pink colour.

Solution

Question 2

BF3

NH3

PH3

H2O

Solution

Question 3

Arrhenius base

Arrhenius acid

Lewis base

Lewis acid

Solution

Question 4

H2

CO

CO2

O2

Solution

Question 5

Na(Zn)2OH

NaZnO2 + H2

Na2ZnO2 + H2

Na + Zn(OH)2

Solution

Question 6

Wash the hand with saline water

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water, apply the solution of sodium hydroxide to the hand

Neutralise the acid with a strong alkali

Solution

Question 7

1 mol L-1 HCl solution

1 mol L-1 H3PO2 solution

1 mol L-1 H2SO4 solution

1 mol L-1 H2CO3 solution

Solution

Question 8

NaHCO3 and Na2CO3

Na2CO3 and NaOH

NaHCO3 and NaOH

NaHCO3 and NaCl

Solution

Question 9

6

0.6

8

0.8

Solution

Question 10

0.1 Molar NaCl solution

0.01 Molar NaHCO3 solution

0.001 Molar Na2CO3 solution

0.01 Molar NaOH solution

Solution

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BF₃

NH₃

PH₃

H₂O

H₂

CO₂

O₂

Na(Zn)₂OH

NaZnO₂ + H₂

Na₂ZnO₂ + H₂

Na + Zn(OH)₂

1 mol L^-1 HCl solution

1 mol L^-1 H₃PO₂ solution

1 mol L^-1 H₂SO₄ solution

1 mol L^-1 H₂CO₃ solution

NaHCO₃ and Na₂CO₃

Na₂CO₃ and NaOH

NaHCO₃ and NaOH

NaHCO₃ and NaCl

0.01 Molar NaHCO₃ solution

0.001 Molar Na₂CO₃ solution