set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on inorganic chemistry topic of general science mcq
| List-I | List-II |
| A. Element with the largest size in the second period | 1. boron |
| B. Element with the smallest size in group 13 | 2. fluorine |
| C. Element with a maximum non-metallic character | 3. bromine |
| D. Element with the smallest size in the fourth period | 4. lithium |
| E. Element with the most metallic character in group 14 | 5. lead |
(a) A – (4); B – (2); C – (1); D – (3); E – (5)
(b) A – (1); B – (4); C – (2); D – (3); E – (5)
(c) A – (4); B – (1); C – (2); D – (5); E – (3)
(d) A – (4); B – (1); C – (2); D – (3); E – (5)
The correct answers to the above question in:
Answer: (d)
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Read more inorganic chemistry Based General Science Questions and Answers
Question : 1
Which of the following statements about pH and $H^+$ ion concentration are incorrect?
- The addition of one drop of concentrated HCl in NH4OH solution decreases the pH of the solution.
- A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7.
- The pH of pure neutral water is not zero.
- A cold and concentrated H2SO4 has a lower $H^+$ ion concentration than a dilute solution of $H_2SO_4$.
a) 1, 2 and 4
b) 1, 3 and 4
c) 1, 2 and 3
d) 2, 3 and 4
Answer »Answer: (a)
CH3COOH is weak acid while NaOH is a strong base, so one equivalent of NaOH can not be neutralized with one equivalent of CH3COOH.
Concentrated H2SO4 has a higher H+ ion concentration than dilute solution of H2SO4.
Question : 2
Which is the most abundant element after oxygen?
a) Silicon
b) Sodium
c) Carbon
d) Chlorine
Answer »Answer: (a)
Question : 3
Consider the following statements:
Hard water does not give lather with soap because hard water contains:
- calcium bicarbonate
- magnesium bicarbonate
- chlorides of calcium and magnesium
- sulphates of calcium and magnesium
a) 1, 2 and 3
b) 3 and 4
c) 1 and 2
d) 1, 2, 3 and 4
Answer »Answer: (b)
Since hard water contains soluble chloride and sulphate salts of calcium and magnesium it forms an insoluble curdy precipitate with soap.
${2C_{17}H_{35}COONa} ↙\text"soluble sodium stearate (soap)" + {CaCl_2} ↙\text"calcium chloride (in hard water)" → {(C_{17}H_{35}COO)_2} ↙\text"insoluble calcium stearate" Ca + 2NaCl$
${2C_{17}H_{35}COONa} ↙\text"soluble sodium stearate" + {MgSO_4} ↙\text"Magnesium chloride (in hard water)" → {(C_{17}H_{35}COO)_2 } ↙\text"insoluble magnesium stearate (soap) " Mg + Na_2SO_4$
Question : 4
The chemical composition of diamond is
a) Carbon
b) Nickel
c) Nitrogen
d) Zinc
Answer »Answer: (a)
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