Question

1. Choose the most correct option.

A. A sample of pure water, whatever the

source always contains by

mass of oxygen and 11.1 % by mass of

hydrogen.

a. 88.9 b. 18 c. 80 d. 16

B. Which of the following compounds can

NOT demonstrate the law of multiple

proportions ?

a. NO, NO2 b. CO, CO2

c. H2

O, H2

O2 d. Na2

S, NaF

C. Which of the following temperature

will read the same value on celsius and

Fahrenheit scales.

a. - 400 b. + 400

c. -800 d. -200

D. SI unit of the quantity electric current is

a. Volt b. Ampere

c. Candela d. Newton

E. In the reaction N2

+ 3H2 2NH3

,

the ratio by volume of N2

, H2

and NH3

is 1 : 3 : 2 This illustrates the law of

a. definite proportion

b. reciprocal proportion

c. multiple proportion

d. gaseous volumes

F. Which of the following has maximum

number of molecules ?

a. 7 g N2 b. 2 g H2

c. 8 g O2

d. 20 g NO2

G. How many g of H2

O are present in 0.25

mol of it ?

a. 4.5 b. 18

c. 0.25 d. 5.4

H. The number of molecules in 22.4 cm3

of

nitrogen gas at STP is

a. 6.022 x 1020

b. 6.022 x 1023

c. 22.4 x 1020

d. 22.4 x 1023

I. Which of the following has the largest

number of atoms ?

a. 1g Au (s) b. 1g Na (s)

c. 1g Li (s) d. 1g Cl2 (g)​

Answer 1

Answer:

a-a

b-c

h-c

Explanation:

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