Science
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.
Acids Bases Salts
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Answer
Bases turn pink when a drop of phenolphthalein is added to them.
Reason — Phenolphthalein is a pH indicator which turns pink when added to a basic solution.
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Related Questions
C6H12O6 (aq) + 6O2 (aq) ⟶ 6CO2 (aq) + 6H2O (l)
The above reaction is a/an
- displacement reaction
- endothermic reaction
- exothermic reaction
- neutralisation reaction
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
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 It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect?
- The total mass of the elements present in the reactants is equal to the total mass of the elements present in the products.
- The number of atoms of each element remains the same, before and after a chemical reaction.
- The chemical composition of the reactants is the same before and after the reaction.
- Mass can neither be created nor can it be destroyed in a chemical reaction.