Question

The result of the operation 2.5 × 1.25 should be which of the following on the basis of significant figures ?

A. 3.125
B. 3.13
C. 3.1  
D. 31.25
Answer :   3.1
Solution :
2.5 × 1.25 = 3.125
Since 2.5 has two significant figures, the result should not have more than two significant figures. Hence, the answer will be 3.1.

Releted MCQ Question on
Physical Chemistry >> Some Basic Concepts in Chemistry

Releted Question 1

$$27 g$$  of $$Al$$  will react completely with how many grams of oxygen?

A. $$8\,g$$
B. $$16\,g$$
C. $$32\,g$$
D. $$24\,g$$
Releted Question 2

A compound was found to contain nitrogen and oxygen in the ratio $$28 gm$$  and $$80 gm$$  respectively. The formula of compound is

A. $$NO$$
B. $${N_2}{O_3}$$
C. $${N_2}{O_5}$$
D. $${N_2}{O_4}$$
Releted Question 3

The largest number of molecules is in

A. $$36\,g$$  of water
B. $$28\,g$$  of carbon monoxide
C. $$46\,g$$  of ethyl alcohol
D. $$54\,g$$  of nitrogen pentoxide
Releted Question 4

The total number of electrons in one molecule of carbon dioxide is

A. 22
B. 44
C. 66
D. 88

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