Chemistry Class-11: Chapter – 1. Some Basic Concepts of Chemistry – Part-6 (For CBSE, ICSE, IAS, NET, NRA 2022)
Get unlimited access to the best preparation resource for NCO : fully solved questions with step-by-step explanation- practice your way to success.
IV. Matching Type
Question-36:
Match the following:
| (i) | (a) | 0.25 mol | |
| (ii) | (b) | 2 mol | |
| (iii) | (c) | 1 mol | |
| (iv) | (d) | molecules | |
| (v) | (e) | 3 mol |
Answer:
Question: 37
Match the following physical quantities with units
| Physical quantity | Unit | ||
| (i) | Molarity | (a) | |
| (ii) | Mole fraction | (b) | |
| (iii) | Mole | (c) | |
| (iv) | Molality | (d) | |
| (v) | Pressure | (e) | |
| (vi) | Luminous intensity | (f) | |
| (vii) | Density | (g) | |
| (viii) | Mass | (h) | |
| (i) | |||
Answer:
V. Assertion and Reason Type
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Question: 38
Assertion (A) : The empirical mass of Ethene is half of its molecular mass.
Reason (R) : The empirical formula represents the simplest whole number ratio of various atoms present in a compound.
(i) Both A and R are true and R is the correct explanation of A.
(ii) A is true but R is false.
(iii) A is false but R is true.
(iv) Both A and R are false.
Answer: (i)
Question: 39
Assertion (A) : One atomic mass unit is defined as one twelfth of the mass of one carbon-12 atom.
Reason (R) : Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.
(i) Both A and R are true and R is the correct explanation of A.
(ii) Both A and R are true but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) Both A and R are false.
Answer: (ii)
Question: 40
Assertion (A) : Significant figures for 0.200 is 3 whereas for 200 it is 1.
Reason (R) : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.
(i) Both A and R are true and R is correct explanation of A.
(ii) Both A and R are true but R is not a correct explanation of A.
(iii) A is true but R is false.
(iv) Both A and R are false.
Answer: (iii)
Question: 41
Assertion (A) : Combustion of 16 g of methane gives 18 g of water.
Reason (R) : In the combustion of methane, water is one of the products.
(i) Both A and R are true but R is not the correct explanation of A.
(ii) A is true but R is false.
(iii) A is false but R is true.
(iv) Both A and R are false.
Answer: (iii)