Acids Bases & Salt

Question 1

Which one of the following is acidic?

Accepted Answer

All

Answer

Lemon juice

Answer

Tomatoes

Answer

Milk

Question 2

Which one of the given is a mineral acid?

Accepted Answer

Lactic acid

Answer

Formic acid

Answer

Tartaric acid

Answer

Hydrochloric acid

Question 3

Which one of the following will turn red litmus blue?

Accepted Answer

Baking soda solution

Answer

Vinegar

Answer

Lemon juice

Answer

Soft drinks

Question 4

Which one of the given is an organic acid?

Accepted Answer

Both (1) & (3)

Answer

Citric acid

Answer

Hydrochloric acid

Answer

Lactic acid

Question 5

Which one of the following will turn blue litmus red?

Accepted Answer

Vinegar

Answer

Lime water

Answer

Baking soda solution

Answer

Washing soda solution

Question 6

Which one of the given is incorrect?

Accepted Answer

Aqueous solutions of acids conduct electricity

Answer

Acids turns blue litmus paper red

Answer

Acids react with certain metals to form hydrogen gas

Answer

None of these

Question 7

Methyl orange is

Accepted Answer

Pink in acidic medium, yellow in basic medium

Answer

Yellow in acidic medium, pink in basic medium

Answer

Colourless in acidic medium, pink in basic medium

Answer

Pink in acidic medium, colorless in basic medium

Question 8

Which one of the given acids is used in the treatment of bone marrow and scurvy diseases?

Accepted Answer

Ascorbic acid

Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Nitric acid

Question 9

Lime water is

Accepted Answer

Ca(OH)2

Answer

CaO

Answer

CaCO3

Answer

CaCI2

Question 10

Acid present in apple is :

Accepted Answer

Malic acid

Answer

Oxalic acid

Answer

Acetic acid

Answer

Formic acid

Question 11

The nature of calcium phosphate is present in tooth enamel is

Accepted Answer

Basic

Answer

Amphoteric

Answer

Acidic

Answer

Neutral

Question 12

Which one of the given is hydracid?

Accepted Answer

H₂SO₄

Answer

H₃PO₄

Answer

HCN

Answer

HNO₃

Question 13

Which of the following salts has no water of crystallization?

Accepted Answer

Baking soda

Answer

Blue vitriol

Answer

Washing soda

Answer

Gypsum

Question 14

Most of the oxides of metals when react with acid, form____

Accepted Answer

A salt

Answer

A base

Answer

An acid

Answer

Either (1) or (2)

Question 15

The function of quick lime in soda lime mixture is to

Accepted Answer

Absorb moisture present in soda lime

Answer

Increase the efficiency of soda lime

Answer

Increase the pH of soda lime

Answer

Take part in reaction with NaOH

Question 16

Generally, when certain metals react with an acid they release _______ gas.

Accepted Answer

Hydrogen

Answer

Nitrogen

Answer

Oxygen

Answer

Argon

Question 17

The Ph of a solution of HCL is 4. This shows that the molarity of the solution is

Accepted Answer

0.0001M

Answer

4.0M

Answer

0.4M

Answer

0.001M

Question 18

A strong acid:

Accepted Answer

Completely gets ionized in water

Answer

Partially gets ionized in water

Answer

Do not get ionized in water

Answer

All the these

Question 19

Which of the given is a strong base?

Accepted Answer

Potassium hydroxide

Answer

Calcium hydroxide

Answer

Magnesium hydroxide

Answer

Ammonium hydroxide

Question 20

Which one of the given is the pH value of pure water?

Accepted Answer

7

Answer

0

Answer

8

Answer

1

Question 21

Which one of the given is true, if a substance has a pH value of 7?

Accepted Answer

The substance is a neutral substance

Answer

The substance is a base

Answer

The substance is a acid

Answer

None

Question 22

Which one of the following is formed when calcium hydroxide reacts with carbon dioxide?

Accepted Answer

Both B and C

Answer

Hydrogen gas

Answer

Water

Answer

Salt

Question 23

Which acid is used in cola to give it a biting sharp taste

Accepted Answer

Phosphoric acid

Answer

Sulphuric acid (H₂SO₄)

Answer

Tartaric acid

Answer

Citric acid

Question 24

When acids dissolve in water it releases _____.

Accepted Answer

H+ ion

Answer

H- ion

Answer

H₃O+ ion

Answer

H₃O2+ ion

Question 25

Which element is always present in Arrhenius acid?

Accepted Answer

Hydrogen

Answer

Oxygen

Answer

Nitrogen

Answer

None of these

Question 26

During the preparation of HCl gas on a humid day, the gas is usually passed through the guard tube containing CaCl₂. The purpose of using CaCl₂ is

Accepted Answer

To absorb moisture from HCl gas

Answer

To add moisture to the gas (HCl)

Answer

To absorb HCl gas

Answer

To Use it as a catalyst

Question 27

Black ash is

Accepted Answer

Barium sulphide

Answer

Dry KOH

Answer

Charcoal

Answer

Hydrated KOH

Question 28

The pH of commonly used toothpaste is

Accepted Answer

≥7.0

Answer

<6.5

Answer

≥2.2

Answer

None of these

Question 29

The pH of Gastric juice is

Accepted Answer

1.5 to 3.5

Answer

<6.5

Answer

≥7.0

Answer

None of these

Question 30

The chemical formula of Plaster of Paris is

Accepted Answer

CaSO₄, 2H₂O

Answer

CaSO₄,1/2H₂O

Answer

CaSO₄, H₂O

Answer

CaSO₄, 3H₂O

Question 31

What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place

Accepted Answer

(i) and (iv)

Answer

(i) only

Answer

(i) and (iii)

Answer

(ii) and (iii)

Question 32

Chemical formula of washing soda is

Accepted Answer

Na₂C0₃ . 10H₂O

Answer

Na₂C0₃ . 7H₂O

Answer

Na₂C0₃ . 5H₂O

Answer

Na₂C0₃ . 2H₂O

Question 33

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

Accepted Answer

Hydrochloric acid

Answer

Baking powder

Answer

Lime

Answer

Ammonium hydroxide solution

Question 34

Sodium hydroxide turns phenolphthalein solution

Accepted Answer

pink

Answer

yellow

Answer

colourless

Answer

orange

Question 35

Two aqueous solutions P and Q have pH of 5 and 13 respectively. The correct inference is that:

Accepted Answer

solution P is of CH3COOH and Q is of NaOH

Answer

solution P is of HCl and Q is of NH4OH

Answer

solution P is of CH3COOH and Q is of Ca(OH)₂

Answer

solution P is of HNO₃ and Q is of NH4OH

Question 36

Sodium hydroxide is used

Accepted Answer

in alkaline batteries

Answer

as an antacid

Answer

in manufacture of soap

Answer

as a cleansing agent

Question 37

The pH of a solution is 7. How can you increase its pH?

Accepted Answer

By adding a small amount of base.

Answer

By adding a small amount of acid

Answer

By adding a small amount of salt.

Answer

By passing carbon dioxide gas through it

Question 38

When copper oxide and dilute hydrochloric acid react, colour changes to

Accepted Answer

bluish-green

Answer

white

Answer

blue-black

Answer

black

Question 39

Sodium carbonate is a basic salt because it is a salt of

Accepted Answer

weak acid and strong base

Answer

strong acid and strong base

Answer

weak acid and weak base

Answer

strong acid and weak base

Question 40

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

Accepted Answer

Hydrochloric acid

Answer

Baking powder

Answer

Lime

Answer

Ammonium hydroxide solution

Question 41

Which gas is evolved when acids react with metals?

Accepted Answer

H₂

Answer

O₂

Answer

CO₂

Answer

N₂

Question 42

Sodium hydroxide is a

Accepted Answer

strong base

Answer

weak base

Answer

weak acid

Answer

strong acid

Question 43

Which of the following gives the correct increasing order of acidic strength?

Accepted Answer

Water < Acetic acid < Hydrochloric acid

Answer

Water < Hydrochloric acid < Acetic acid

Answer

Acetic acid < Water < Hydrochloric acid

Answer

Hydrochloric acid < Water < Acetic acid

Question 44

Rain is called acid rain when its:

Accepted Answer

pH falls below 5.6

Answer

pH falls below 7

Answer

pH falls below 6

Answer

pH is above 7

Question 45

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Accepted Answer

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.

Answer

Wash the hand with saline solution.

Answer

After washing with plenty of water and apply solution of sodium hydroxide on the hand.

Answer

Neutralise the acid with a strong alkali.

Question 46

Farmers neutralise the effect of acidity of the soil by adding

Accepted Answer

slaked lime

Answer

gypsum

Answer

caustic soda

Answer

baking soda

Question 47

What is the pH range of our body?

Accepted Answer

7.0 – 7.8

Answer

7.2 – 8.0

Answer

7.0 – 8.4

Answer

7.2 – 8.4

Question 48

A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for identification?

Accepted Answer

Red litmus

Answer

Blue litmus

Answer

Sodium carbonate solution

Answer

Dilute hydrochloric acid

Question 49

Tooth enamel is made up of

Accepted Answer

calcium phosphate

Answer

calcium carbonate

Answer

calcium oxide

Answer

potassium

Question 50

Nettle sting is a natural source of which acid?

Accepted Answer

Methanoic acid

Answer

Lactic acid

Answer

Citric acid

Answer

Tartaric acid

Question 51

Increase in the OH– ion concentration, leads to

Accepted Answer

an increases in the pH of solution

Answer

a decrease in the pH of the solution

Answer

doesn’t alter the pH of the solution

Answer

decreases the basic strength of the solution

Question 52

Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base

Accepted Answer

(ii) and (iv)

Answer

(i) and (iii)

Answer

(ii) and (iii)

Answer

(i) and (iv)

Question 53

Lime water reacts with chlorine to give

Accepted Answer

bleaching powder

Answer

baking powder

Answer

baking soda

Answer

washing soda

Question 54

Alkalis are

Accepted Answer

bases, which are soluble in water

Answer

acids, which are soluble in water

Answer

acids, which are insoluble in water

Answer

bases, which are insoluble in water

Question 55

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

Accepted Answer

. Base

Answer

. Acid

Answer

. Water

Answer

. All of the above

Question 56

Acids react with metals to liberate _________gas

Accepted Answer

. Hydrogen

Answer

. Carbon dioxide

Answer

. Carbon monoxide

Answer

. Water

Question 57

Acids react with metal carbonates to liberate ______ gas

Accepted Answer

. Carbon dioxide

Answer

. Carbon monoxide

Answer

. Hydrogen

Answer

. Water

Question 58

Lime water turns milky when carbon dioxide is passed due to the formation of ______.

Accepted Answer

. CaCO3

Answer

. CaO

Answer

. CO2

Answer

. CaSO4

Question 59

The milkiness (on passing excess carbon dioxide gas through lime water) disappears due to the formation of:

Accepted Answer

. Calcium carbonate CaCO₃

Answer

. Calcium hydrogen carbonate CaHCO₃

Answer

. Calcium oxide CaO

Answer

. Calcium Nitrate Ca(NO3)₂

Question 60

Acids react with bases to form salt and water. This reaction is known as:

Accepted Answer

. Neutralisation

Answer

. Combination

Answer

. Decomposition

Answer

. reduction

Question 61

A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolved.

Accepted Answer

. Calcium Carbonate, Carbon dioxide

Answer

. Calcium chloride, carbon dioxide

Answer

. Calcium oxide, hydrogen

Answer

. Calcium carbonate, hydrogen

Question 62

How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

Accepted Answer

. Decreases

Answer

. Increases

Answer

. Remains the same

Answer

. Becomes zero

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