1. Choose the most correct option A sample of pure water, whatever the source always contains

Question

std 11th maharashtra board book 

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. H₂O, H₂O₂

d. Na₂S, NaF

C.  Which of the following temperature will read the same value on celsius and Fahrenheit scales.

a. - 40° 

b. + 40° 

c. -80° 

d. -20°

 D. SI unit of the quantity electric current is ........

a. Volt

b. Ampere

c. Candela

d. Newton

E. In the reaction N₂+ 3H₂ \(\rightarrow\)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 H₂O 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

The answer is highlighted in question like this 

correct answer

 Answers )

Q1. Choose the most correct option

A)  a. 88.9

B) d. Na₂S, NaF

C) a. - 40°  

D) b. Ampere

E) d. gaseous volumes 

F) b. 2 g H₂

G) a. 4.5 

H) a. 6.022 x 10²⁰ 

I)  c. 1g Li (s)