Basic Concepts in Chemistry (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry): Questions 18 - 21 of 91

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Question number: 18

» Basic Concepts in Chemistry » Mole Concept

MCQ▾

Question

In the final answer of the expression . The number of significant figures is

Choices

Choice (4) Response

a.

1

b.

2

c.

3

d.

4

Question number: 19

» Basic Concepts in Chemistry » Molar Mass

MCQ▾

Question

Choose the correct statements -

(1) Double decomposition method is based on the law of equivalent.

(2) For a reaction, → products

If amount of reacted = gm and amount of reacted = gm then

=

(3) For a reaction → products

If amount of reacted = gm and amount of reacted = gm then

=

(4) 1 equivalent of oxygen = 16 gm

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

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 is needed to convert 62 gm of in in the reaction?

Choices

Choice (4) Response

a.

126 gm

b.

315 gm

c.

63 gm

d.

630 gm

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