Class vii science chapter 5

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Acids, Bases and Salts CBSE Class 7 Important
Question and Answers
Acids, Bases and Salts

Q 1.Name the following:
(i) Substances which gives hydronium ion ( H+) in solution.
Ans: Acids
(ii) Substances which turn blue litmus solution red.
 Ans:Acids
(iii) Substances which gives hydroxyl ion (OH-) in solution.
   Ans:  Bases
(iv) Substances which turn turmeric paper red.
 Ans:    Bases
(v) Chemical name for salt which we consume everyday.
 Ans:     Sodium Chloride
(vi) Base used as foaming agent in fire extinguisher.
 Ans:  Sodium Hydrogen Carbonate
(vii) A commonly used antacid.
   Ans: Baking Soda
(viii) The substances on which litmus solution has no effect.
 Ans:  Neutrals
(ix) The colour of turmeric solution in soap solution.
 Ans:    Red
(x) Examples of any two mineral acids and organic acids.
 Ans:  Mineral Acids: a)Hydrochloric Acid b).Nitric Acid
            Organic Acids: a)Acetic Acid b)Citric Acid
(xi) Write the name and colour of two salts found in the laboratory.
 Ans: Copper sulphate(blue),ferous Sulphate

Q 2. Fill in the blanks:

i) The new substance formed when an acid reacts with a base is __________.
   Ans:   Salt and water
(ii) Heat is Evolved during _________ reaction.
    Ans:   Neutralization
(III) When dilute sulphuric acid is added to lime water, the reaction mixture becomes_________________.
   Ans:     Neutralize
(IV) _______acid is present in our stomach.
    Ans:   HCL
(v) Milk of magnesia contains a base called_________.
    Ans:   Magnesium Hydroxide
(vi) Calamine lotion contains__________.
    Ans:     Zinc Carbonate

Q 3. Name the acids present in the following
     (1) Curd ~~~  Lactic Acid
     (t) Spinach~~~Oxalic
    (1) Tamarind~~~Tartaric Acid
    (iv) Amla ~~~Ascorbic Acid
    (V) Aerated drinks~~~Carbonic Acid
    (vi) Vinegar~~~Acetic Acid
   (vii) Apple~~~Malic Acid

Q 6. Name the bases present in the following :
Lime water:Calcium Hydroxide (ii) Soap Sodium Hydroxide (iii) Milk of
magnesia:Magnesium Hydroxide
(iv) Slaked lime:Sodium Hydrogen Carbonate (W) Caustic soda:Sodium Hydroxide (vi) Caustic
potash: Potassium Hydroxide
Q.7 Give the natural source of the following acids:
(1) Citric acid :   Citrus fruits such as oranges,lemons, etc
(ii) Lactic acid:  Curd
(iii) Acetic acid:  Vinegar
(iv) Tartaric acid:  Tamarind grapes, unripe mangoes
(V) Oxalic acid: spinach
(vi) Maleic acid: apple



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