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

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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 HNO3 is needed to convert 62 gm of P4 in H3PO4 in the reaction?

P4+3HNO3H3PO4+NO2+H2O

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.

1(M)H2SO4

b.

1 MPO3

c.

1(M)H3PO4

d.

1(M)HNO3

Question number: 23

» Basic Concepts in Chemistry » Mole Concept

MCQ▾

Question

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

(1) 4.003 (2) 6.023×1023 (3) 5000

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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