Fundamental Concepts

 

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2. Fundamental Concepts

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Practice MCQS

1)  What mass of NaOH is present in O.5 mol of sodium hydroxide?

a) 40 gm

b) 2.5 gm

c) 15 gm

d) 20 gm 

2) Molal freezing point constant of water is:

a) 1.86 

b) 2.86

c) 11.86

d) 0.52 

3) 4g of NaOH is dissolved per 100g of solvent. The molarity of solution is:

a) 0.1 m

b) 1 m 

c) 0.2 m

d) 2 m 

4) The number of moles of NO2 which contains 16g of oxygen

a) 0.25

b) 1.0

c) 0.50 

d) 1.5 

5) A polymer of empirical formula CH2 has a molar mass of 28000 gmol^-1. What is its molecular formula?

a) (CH2) 1400

b) (CH2) 2000 

c) (CH2) 2800

d) (CH2) 2500 

6) 90g of glucose is dissolved in 90g of water. The mole fraction of water is: 

a)50/51

b) 1

c) 50/55 

d) 5.1 

7)When 0.5 moles of Al2(SO4)3 are dissolved in water, total number of particles produced:

a) 1.5 × 10^23

b) 3.0 × 10^23

c) 3.0 × 10^24

d) 1.5 × 10^24 

8) Mass in grams of 10 moles of aspartame (C14 H18 N2 05):

a) 29400g

b) 2940g 

c) 294g

d) 2850g 

9) 11g of a gas occupies 5.6 dm3 at STP. the gas is:

a) CO

b) C3H8 

c) NO

d) SO2 

10) How many sigma electrons are present in 9g of ice?

(Na= Avogadro’s number)

a) Na/2

b) Na 

c) 2Na

d) 3Na

KEY

1-D , 2-A , 3-B , 4-C , 5-B , 6-C , 7- D , 8-B , 9-B , 10-B