Science
Study the experimental set-up shown in given figure and choose the correct option from the following:
| P | Q | Change observed in calcium hydroxide solution |
|---|---|---|
| 1.K2CO3 | Cl2 gas | No change |
| 2.KHCO3 | CO2 gas | No change |
| 3.KHCO3 | H2 gas | Turns milky |
| 4.K2CO3 | CO2 gas | Turns milky |
Hydrogen Chloride
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Answer
| K2CO3 | CO2 gas | Turns milky |
Reason — The reaction between potassium carbonate and HCl gas produces carbon dioxide gas.
K2CO3 + 2HCl (dil.) ⟶ 2KCl + H2O + CO2
Calcium hydroxide reacts with carbon dioxide gas and forms calcium carbonate, which turns the solution milky.
Ca(OH)2 + CO2 ⟶ CaCO3 + H2O
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Related Questions
Consider the pH value of the following acidic samples :
S.
No.Sample pH Value 1. Lemon Juice 2.2 2. Gastric Juice 1.2 3. Vinegar 3.76 4. Dil. Acetic acid 3.0 The decreasing order of their H+ ion concentration is
- 3 > 4 > 1 > 2
- 2 > 1 > 3 > 4
- 2 > 1 > 4 > 3
- 3 > 4 > 2 > 1
Which one of the following structures correctly depicts the compound CaCl2?
Which one of the following reactions is categorized as a thermal decomposition reaction?
- 2H2O (l) ⟶ 2H2(g) + O2 (g)
- 2AgBr(s) ⟶ 2Ag(s) + Br2(g)
- 2AgCl(s) ⟶ 2Ag(s) + Cl2(g)
- CaCO3(s) ⟶ CaO(s) + CO2(g)
The pair(s) which will show displacement reaction is/are
(i) NaCl solution and copper metal
(ii) AgNO3 solution and copper metal
(iii) Al2(SO4)3 solution and magnesium metal
(iv) ZnSO4 solution and iron metal
- (ii) only
- (ii) and (iii)
- (iii) and (iv)
- (i) and (ii)