Chemistry Class-11: Chapter –1. Some Basic Concepts of Chemistry – Part-6

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IV. Matching Type

Question-36:

Match the following:

Match Physical Quantities
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 Quantities and their 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)