Science
Which of the following statements about the reaction given below are correct?
MnO2 + 4HCl ⟶ MnCl2 + 2H2O + Cl2
(i) HCl is oxidized to Cl2
(ii) MnO2 is reduced to MnCl2
(iii) MnCl2 acts as an oxidizing agent
(iv) HCl acts as on oxidizing agent
- (ii), (iii) and (iv)
- (i), (ii) and (iii)
- (i) and (ii) only
- (iii) and (iv) only
Chemical Reaction
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Answer
(i) and (ii) only
Reason — The reaction is a redox reaction where, HCl is oxidized to Cl2 as it loses hydrogen whereas MnO2 is reduced to MnCl2 as it loses oxygen.
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Select from the following the statement which is true for bases.
- Bases are bitter and turn blue litmus red.
- Bases have a pH less than 7.
- Bases are sour and change red litmus to blue.
- Bases turn pink when a drop of phenolphthalein is added to them.
Study the following table and choose the correct option:
S.
No.Salt Parent Acid Parent Base Nature of Salt (a) Sodium Chloride HCl NaOH Basic (b) Sodium Carbonate H2CO3 NaOH Neutral (c) Sodium Sulphate H2SO4 NaOH Acidic (d) Sodium Acetate CH3COOH NaOH Basic