Class 11 Chemistry MCQ Chapter 1 Some Basic Concepts of Chemistry Solutions to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Chemistry MCQ Chapter 1 Some Basic Concepts of Chemistry Solutions and select need one. Class 11 Chemistry MCQ Chapter 1 Some Basic Concepts of Chemistry Question Answers Download PDF. AHSEC Chemistry Multiple Choice Class 11 Solutions.
Class 11 Chemistry MCQ Chapter 1 Some Basic Concepts of Chemistry
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Some Basic Concepts of Chemistry
Chapter: 1
| MCQ |
1. Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be:
(i) 36.89
(ii) 10.9
(iii) 15.8
(iv) 26.7
Ans: (iv) 26.7
2. Which is not a unit of pressure:
(i) Bar.
(ii) N/m²
(iii) Kg/m²
(iv) Torr.
Ans: (iii) Kg/m²
3. The branch of chemistry that deals with the quantitative relationships between the reactants and products in chemical reactions is called:
(i) Analytical chemistry.
(ii) Physical chemistry.
(iii) Organic chemistry.
(iv) Inorganic chemistry.
Ans: (ii) Physical chemistry.
4. Which of the following is NOT a basic unit of measurement in the International System of Units (SI)?
(i) Metre.
(ii) Gram.
(iii) Kelvin.
(iv) Pound.
Ans: (iv) Pound.
5. An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be:
(i) CHO.
(ii) CH4O.
(iii) CH3O.
(iv) CH2O.
Ans: (iii) CH₃O.
6. A measured temperature on Fahrenheit scale is 200°F. What will this reading be on Celsius scale?
(i) 40°C.
(ii) 94°C.
(iii) 93.3°C.
(iv) 30°C.
Ans: (iii) 93.3°C.
7. What will be the molarity of solution, which contains 5.85 g NaCl(s) per 500 mL?
(i) 4 mol L-1
(ii) 20 mol L-1
(iii) 0.2mol L-1
(iv) 2 mol L-1
Ans. (iii) 0.2mol L-1
8. What is the concentration of nitrate ions if equal volumes of 0.1 MAgNO3 and 0.1 M NaCl are mixed together:
(a) 0.1 M.
(b) 0.2 M.
(c) 0.05 M.
(d) 0.25 M.
Ans: (c) 0.05 M.
9. If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the mola-rity of the solution obtained?
(i) 1.5 M.
(ii) 1.66 M.
(iii) 0.017 M.
(iv) 1.59 Μ.
Ans: (ii) 1.66 М.
10. The SI unit for temperature is:
(i) Fahrenheit.
(ii) Celsius.
(iii) Kelvin.
(iv) Rankine.
Ans: (iii) Kelvin.
11. What was one of the reasons for the decline of iatrochemistry in India?
(i) Rise of modern science in Europe.
(ii) Lack of resources for alchemy.
(iii) Introduction of the Western medicinal system.
(iv) Emergence of Ayurveda.
Ans: (iii) Introduction of the Western medicinal system.
12. When did modern chemistry begin to grow in India according to the passage?
(i) Early nineteenth century.
(ii) Mid-nineteenth century.
(iii) Late eighteenth century.
(iv) Twentieth century.
Ans: (ii) Mid-nineteenth century.
13. The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
(i) 4 g He.
(ii) 46 g Na.
(iii) 0.40 g Ca.
(iv) 12 g He.
Ans. (iv) 12 g He.
14. The number of significant figures in the measurement 0.00345 is:
(i) 2
(ii) 3
(iii) 4
(iv) 5
Ans: (iii) 4
15. Which of the following is a major contribution of chemistry to healthcare?
(i) Production of optical fibres.
(ii) Synthesis of superconducting ceramics.
(iii) Isolation and synthesis of life-saving drugs.
(iv) Manufacture of dyes.
Ans: (iii) Isolation and synthesis of life-saving drugs.
