Acids, Bases and Salts

Solutions which do not change the colour of litmus are

1. Acidic
2. Basic
3. Neutral
4. Both acidic and basic

Milk of magnesia used to treat acidity in stomach contains this base

1. Magnesium hydroxide
2. Ammonium hydroxide
3. Sodium hydroxide
4. Copper hydroxide

When turmeric stain on white clothes is washed with soap it turns red in colour because

1. Soap solution is acidic
2. Soap solution is neutral
3. Soap solution is basic
4. Both (a) & (b)

The industrial waste is ___ in nature

1. Acidic
2. Basic
3. Neutral
4. Both acidic and basic

The acid present in our stomach which helps in digestion of food

1. Sulphuric acid (H2SO4)
2. Nitric acid (HNO3)
3. Hydrochloric acid (HCl)
4. Phosphoric acid (H3PO4)

Natural indicator litmus is extracted from

1. Lichens
2. Earthworms
3. Ants
4. Algae

Acid contained in the sting of an ant is

1. Acetic acid
2. Formic acid
3. Lactic acid
4. Ascorbic acid

China rose indicator turns acidic solution to ___ and the basic solution to ___

1. Dark pink, blue
2. Red, yellow
3. Dark pink, green
4. Red, green

The acidic soil which is not good for healthy growth of plants, is neutralized by

1. Ammonium hydroxide (NH4OH)
2. Calcium oxide (CaO)
3. Sodium hydroxide (NaOH)
4. Magnesium hydroxide [Mg(OH)2]

When an acid and a base reacts with each other the reaction mixture becomes

1. Hot
2. Cold
3. Acidic
4. Basic

Acid rain is caused due to ___

1. CO2, O2, SO2
2. CO2, NO2, H2
3. SO2, N2, O2
4. CO2, SO2, NO2

Match the compounds with their uses: Caustic soda-?, Phosphoric acid-?, Calcium hydroxide-?, Hydrochloric acid-?

1. (i)-(B),(ii)-(D),(iii)-(A),(iv)-(C)
2. (i)-(C),(ii)-(A),(iii)-(D),(iv)-(B)
3. (i)-(C),(ii)-(D),(iii)-(A),(iv)-(B)
4. (i)-(B),(ii)-(A),(iii)-(D),(iv)-(C)

When ammonia gas is dissolved in water it reacts to form

1. Ammonia water
2. Ammonium hydroxide
3. Ammonia acid
4. All the above

The reaction of acid and a base to form salt and water only is called

1. Neutralization
2. Addition
3. Substitution
4. Oxidation

Choose the correct statement(s): (i) Most acids are water soluble (ii) Acids react with metallic oxides and hydroxides to form metallic salt and water only (iii) Acids react with metallic carbonates to form metallic salt and hydrogen gas and water (iv) Acetic acid is used as a food preservative

1. (i) & (ii) only
2. (iii) & (iv)
3. (i), (ii) & (iv)
4. All of the above

Acids react with metals to liberate ___ gas

1. Oxygen
2. Carbon dioxide
3. Hydrogen
4. Nitrogen

A base which dissolves in water is called

1. Soluble base
2. Alkali
3. Acid
4. Oxide

Acids are ___ in taste while bases are ___ in taste

1. Sweet, salty
2. Sweet, sour
3. Sour, salty
4. Sour, bitter

Alkali which does not decompose on heating but melts

1. Sodium hydroxide (NaOH)
2. Calcium hydroxide [Ca(OH)2]
3. Ammonium hydroxide (NH4OH)
4. Copper hydroxide [Cu(OH)2]

When a drop of phenolphthalein is introduced in lime water, the solution turns

1. Blue
2. Red
3. Milky
4. Pink

Which of the following is a strong base?

1. Ammonium hydroxide (NH4OH)
2. Sodium hydroxide (NaOH)
3. Water (H2O)
4. Sulfuric acid (H2SO4)

___ is known as ascorbic acid which is present in citrus fruits

1. Vitamin D
2. Vitamin C
3. Vitamin A
4. Vitamin K

The acid used for preserving food articles

1. Acetic acid
2. Tartaric acid
3. Sulphuric acid
4. Nitric acid

Acids turn methyl orange solution

1. Blue
2. Pink
3. Red
4. Colorless

Match the following: Grapes-?, Vinegar-?, Lemons-?, Sour milk-?

1. (i)-(C),(ii)-(A),(iii)-(D),(iv)-(B)
2. (i)-(B),(ii)-(A),(iii)-(D),(iv)-(C)
3. (i)-(D),(ii)-(A),(iii)-(B),(iv)-(C)
4. (i)-(B),(ii)-(C),(iii)-(D),(iv)-(A)