Chemistry Class-11: Chapter – 1. Some Basic Concepts of Chemistry – Part-6 (For CBSE, ICSE, IAS, NET, NRA 2022)

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IV. Matching Type

Question-36:

Match the following:

Match Physical Quantities
(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 Quantities and Their Units
Physical quantityUnit
(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)