Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following acid is present in the sting of an ant?

A
Oxalic acid

B
Succinic acid

C
Tartaric acid

D
Formic acid

Solution

Ants are also known as Formica in Latin.
A string of an ant contains formic acid /methanoic acid and that is why there is a burning and itching sensation after an ant's bite.
Question 2
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China rose indicator turns basic solution to:

A
yellow

B
orange

C
magenta

D
green

Solution

China rose is a natural indicator.
It helps us to identify whether a given solution is acidic, basic, or neutral by itself undergoing a color change.
It turns to dark pink with acid and changes its color to green in the basic medium.
Hence, the correct answer is option $$(D)$$.
Question 3
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The natural indicator litmus is extracted from:

A
beetroot

B
china rose

C
lichens

D
turmeric

Solution

The natural indicator litmus is extracted from lichens. Acids turn blue litmus red and bases turn red litmus to blue.
China rose contains anthocyanin which also acts as the natural indicator. Other natural indicators are beetroot and turmeric.
Hence, the correct answer is the option (C).
Question 4
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The indicator that gives green colour with a base is:

A
red litmus

B
china rose

C
blue litmus

D
none of these

Solution

China rose solution gives dark pink (magenta) colour with acid and green colour with base.
Question 5
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Which acids/ bases are used for the following?
(i) To neutralize sting of wasps
(ii) In alkaline batteries
(iii) Manufacturing of soap

A
(i) $$CH_3CHO$$ (ii) $$CsOH$$ (iii) $$Ca(OH)_2$$

B
(i) $$CH_3COOH$$ (ii) $$CuSO_4$$ (iii)$$ Ba(OH)_2$$

C
(i) $$CH_3COOH$$ (ii) $$KOH$$ (iii)$$ NaOH$$

D
None of these

Solution

1. Formic acid is produced by ants and acetic acid is used as anti-wasp agents.
2. In alkali batteries a base is used as an electrolyte which gives hydroxyl ions in solution.
3. Manufacturing of soap requires an alkali like $$NaOH$$ and long chain of fatty acids like sodium stearate to form an ester or sodium acetate salt.
Question 6
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What happens when blue litmus paper is dipped into chlorine water?

A
Paper becomes red

B
Paper becomes white

C
Paper remains blue

D
Paper dissolves

Solution

Chlorine water on standing initially gives an amount of hypochlorous acid $$HOCl$$. So, the color of the litmus paper will change from blue to red. After some time $$HCl$$ and $$HClO_3$$ will be produced and both of them are acidic.

$$Cl_2+H_2O\longrightarrow HClO_3+ HCl$$
Hence, option $$A$$ is correct.
Question 7
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Hydrogen chloride gas turns the blue litmus paper:

A
green

B
red

C
black

D
no change in colour

Solution

The colour of blue litmus paper changes only in the presence of ions like hydrogen ($$H^+$$) or hydronium ($$H_3O^+$$) ions. HCl can produce these ions only in an aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper.
Question 8
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A drop of a liquid sample was put on the pH paper. The color of the pH paper turned blue. The liquid sample could be that of:

A
Lemon juice

B
Hydrochloric acid

C
Sodium bicarbonate solution

D
Ethanoic acid

Solution

Bases change red litmus solution blue.

The liquid sample could be sodium bicarbonate solution.
Question 9
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Directions For Questions

Select the correct answer from $$A,\ B,\ C,\ D,\ E$$ and $$F$$ for each statement given below:
$$(A) : HCl$$
$$(B) : NH_4OH$$
$$ (C) : Al(OH)_3$$
$$ (D) :H_2CO_3$$
$$ (E) : Na_2SO_4$$

...view full instructions

An alkali used for removing grease stains is:

A
$$ HCl$$

B
$$ Al(OH)_3$$

C
$$ NH_4OH$$

D
$$ Na_2SO_4$$

Solution

Ammonium hydroxide is a moderately strong alkali cleaner to clean windows,ovens,greasy stains. It has very strong irritating fumes.
Question 10
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______ turns red litmus to blue.

A
Acid

B
Base

C
Both of A and B

D
None of A or B

Solution

Bases turn red litmus blue and acids turn blue litmus red.
Litmus is an indicator used to determine whether a solution is acidic or basic by changing its colour.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 8

Result

Acids Bases and Salts Test - 8

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SHARING IS CARING

Question 1

Oxalic acid

Succinic acid

Tartaric acid

Formic acid

Solution

Question 2

yellow

orange

magenta

green

Solution

Question 3

beetroot

china rose

lichens

turmeric

Solution

Question 4

red litmus

china rose

blue litmus

none of these

Solution

Question 5

(i) $$CH_3CHO$$ (ii) $$CsOH$$ (iii) $$Ca(OH)_2$$

(i) $$CH_3COOH$$ (ii) $$CuSO_4$$ (iii)$$ Ba(OH)_2$$

(i) $$CH_3COOH$$ (ii) $$KOH$$ (iii)$$ NaOH$$

None of these

Solution

Question 6

Paper becomes red

Paper becomes white

Paper remains blue

Paper dissolves

Solution

Question 7

green

red

black

no change in colour

Solution

Question 8

Lemon juice

Hydrochloric acid

Sodium bicarbonate solution

Ethanoic acid

Solution

Question 9

$$ HCl$$

$$ Al(OH)_3$$

$$ NH_4OH$$

$$ Na_2SO_4$$

Solution

Question 10

Acid

Base

Both of A and B

None of A or B

Solution

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