Basic Concepts in Chemistry (NEET Chemistry): Questions 20 - 24 of 91

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Question number: 20

» Basic Concepts in Chemistry » Mole Concept

Assertion-Reason▾

Assertion (Ꭺ)

1.231 has three significant figures.

Reason (Ꭱ)

All numbers right to the decimal point are significant.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 21

» Basic Concepts in Chemistry » Mole Concept

MCQ▾

Question

What weight of Equation is needed to convert 62 gm of Equation in Equation in the reaction?

Equation

Choices

Choice (4) Response

a.

126 gm

b.

315 gm

c.

63 gm

d.

630 gm

Question number: 22

» Basic Concepts in Chemistry » Mole Concept

MCQ▾

Question

which of the following has the highest normality? (Consider each of the acid is 100 % ionized. )

Choices

Choice (4) Response

a.

Equation

b.

1 MPO3

c.

Equation

d.

Equation

Question number: 23

» Basic Concepts in Chemistry » Mole Concept

MCQ▾

Question

How many significant figures are in each of the following numbers?

(1) Equation (2) Equation (3) Equation

Choices

Choice (4) Response

a.

4, 4, 4

b.

3, 4, 3

c.

4, 3, 2

d.

3, 4, 1

Question number: 24

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1: 2: 3: 4: 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and

Choices

Choice (4) Response

a.

80 parts by weight of Y

b.

32 parts by weight of Y

c.

48 parts by weight of Y

d.

64 parts by weight of Y

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