Science
Study the diagram given below and identify the gas formed in the reaction.
- Carbon di-oxide which extinguishes the burning candle.
- Oxygen due to which the candle burns more brightly.
- Sulphur dioxide which produces a suffocating smell.
- Hydrogen which while burning produces a popping sound.
Hydrogen
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Answer
Hydrogen which while burning produces a popping sound.
Reason — When zinc reacts with sulphuric acid, it produces hydrogen gas and zinc sulphate.
Zn + H2SO4 ⟶ ZnSO4 + H2↑
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Related Questions
A student took Sodium Sulphate solution in a test tube and added Barium Chloride solution to it. He observed that an insoluble substance has formed. The colour and molecular formula of the insoluble substance is:
- Grey, Ba2SO4
- Yellow, Ba(SO4)2
- White, BaSO4
- Pink, BaSO4
Which of the following oxide(s) is/are soluble in water to form alkalis?
(i) Na2O
(ii) SO2
(iii) K2O
(iv) NO2
- (i) and (iii)
- (i) only
- (ii) and (iv)
- (iii) only
Sodium reacts with water to form sodium hydroxide and hydrogen gas. The balanced equation which represents the above reaction is
- Na(s) + 2H2O(l) ⟶ 2NaOH(aq) + 2H2(g)
- 2Na(s) + 2H2O(l) ⟶ 2NaOH(aq) + H2(g)
- 2Na(s) + 2H2O(l) ⟶ NaOH(aq) + 2H2(g)
- 2Na(s) + H2O(l) ⟶ 2NaOH(aq) + 2H2(g)
Which of the options in the given table are correct?
Option Natural Source Acid Present (i) Orange Oxalic acid (ii) Sour milk Lactic acid (iii) Ant sting Methanoic acid (iv) Tamarind Acetic acid - (i) and (ii)
- (i) and (iv)
- (ii) and (iii)
- (iii) and (iv)