Acids, Bases and Salts
Science · Class 7 · CBSE
ScienceClass 7CBSEEasy
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When an acid and a base reacts with each other the reaction mixture becomes
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All questions in this chapter
25 multiple choice questions on Acids, Bases and Salts — Science, Class 7. Open any question for its answer and explanation.
Q1.Solutions which do not change the colour of litmus are
- A.Acidic
- B.Basic
- C.Neutral
- D.Both acidic and basic
Q2.Milk of magnesia used to treat acidity in stomach contains this base
- A.Magnesium hydroxide
- B.Ammonium hydroxide
- C.Sodium hydroxide
- D.Copper hydroxide
Q3.When turmeric stain on white clothes is washed with soap it turns red in colour because
- A.Soap solution is acidic
- B.Soap solution is neutral
- C.Soap solution is basic
- D.Both (a) & (b)
Q4.The industrial waste is ___ in nature
- A.Acidic
- B.Basic
- C.Neutral
- D.Both acidic and basic
Q5.The acid present in our stomach which helps in digestion of food
- A.Sulphuric acid (H2SO4)
- B.Nitric acid (HNO3)
- C.Hydrochloric acid (HCl)
- D.Phosphoric acid (H3PO4)
Q6.Natural indicator litmus is extracted from
- A.Lichens
- B.Earthworms
- C.Ants
- D.Algae
Q7.Acid contained in the sting of an ant is
- A.Acetic acid
- B.Formic acid
- C.Lactic acid
- D.Ascorbic acid
Q8.China rose indicator turns acidic solution to ___ and the basic solution to ___
- A.Dark pink, blue
- B.Red, yellow
- C.Dark pink, green
- D.Red, green
Q9.The acidic soil which is not good for healthy growth of plants, is neutralized by
- A.Ammonium hydroxide (NH4OH)
- B.Calcium oxide (CaO)
- C.Sodium hydroxide (NaOH)
- D.Magnesium hydroxide [Mg(OH)2]
Q10.When an acid and a base reacts with each other the reaction mixture becomes
- A.Hot
- B.Cold
- C.Acidic
- D.Basic
Q11.Acid rain is caused due to ___
- A.CO2, O2, SO2
- B.CO2, NO2, H2
- C.SO2, N2, O2
- D.CO2, SO2, NO2
Q12.Match the compounds with their uses: Caustic soda-?, Phosphoric acid-?, Calcium hydroxide-?, Hydrochloric acid-?
- A.(i)-(B),(ii)-(D),(iii)-(A),(iv)-(C)
- B.(i)-(C),(ii)-(A),(iii)-(D),(iv)-(B)
- C.(i)-(C),(ii)-(D),(iii)-(A),(iv)-(B)
- D.(i)-(B),(ii)-(A),(iii)-(D),(iv)-(C)
Q13.When ammonia gas is dissolved in water it reacts to form
- A.Ammonia water
- B.Ammonium hydroxide
- C.Ammonia acid
- D.All the above
Q14.The reaction of acid and a base to form salt and water only is called
- A.Neutralization
- B.Addition
- C.Substitution
- D.Oxidation
Q15.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
- A.(i) & (ii) only
- B.(iii) & (iv)
- C.(i), (ii) & (iv)
- D.All of the above
Q16.Acids react with metals to liberate ___ gas
- A.Oxygen
- B.Carbon dioxide
- C.Hydrogen
- D.Nitrogen
Q17.A base which dissolves in water is called
- A.Soluble base
- B.Alkali
- C.Acid
- D.Oxide
Q18.Acids are ___ in taste while bases are ___ in taste
- A.Sweet, salty
- B.Sweet, sour
- C.Sour, salty
- D.Sour, bitter
Q19.Alkali which does not decompose on heating but melts
- A.Sodium hydroxide (NaOH)
- B.Calcium hydroxide [Ca(OH)2]
- C.Ammonium hydroxide (NH4OH)
- D.Copper hydroxide [Cu(OH)2]
Q20.When a drop of phenolphthalein is introduced in lime water, the solution turns
- A.Blue
- B.Red
- C.Milky
- D.Pink
Q21.Which of the following is a strong base?
- A.Ammonium hydroxide (NH4OH)
- B.Sodium hydroxide (NaOH)
- C.Water (H2O)
- D.Sulfuric acid (H2SO4)
Q22.___ is known as ascorbic acid which is present in citrus fruits
- A.Vitamin D
- B.Vitamin C
- C.Vitamin A
- D.Vitamin K
Q23.The acid used for preserving food articles
- A.Acetic acid
- B.Tartaric acid
- C.Sulphuric acid
- D.Nitric acid
Q24.Acids turn methyl orange solution
- A.Blue
- B.Pink
- C.Red
- D.Colorless
Q25.Match the following: Grapes-?, Vinegar-?, Lemons-?, Sour milk-?
- A.(i)-(C),(ii)-(A),(iii)-(D),(iv)-(B)
- B.(i)-(B),(ii)-(A),(iii)-(D),(iv)-(C)
- C.(i)-(D),(ii)-(A),(iii)-(B),(iv)-(C)
- D.(i)-(B),(ii)-(C),(iii)-(D),(iv)-(A)