Question

1) 234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution .........

(a) 0.1

(b) 0.5

(c) 5.5

(d) 55

 

2) The atmospheric pollution is generally measured in the units of .....

(a) mass percentage

(b) volume percentage

(c) volume fraction

(d) ppm

Answer 1

Solution :

1) 

Step 1 :

Weight of water in sugar syrup                              = 234.2 − 34.2                                            = 200gm

Molecular weight of sugar = 342 gm 

Step 2 :

Molal concentration                                             =(34.2 / 342)×(1000 / 200​​​​​​)                     = 0.5 

Therefore, Molal concentration of solution is 0.5                                                   

2) Since the amount and size of pollutants present in atmospheric environment is very small in size Therefore,  d) ppm is correct answer

1) b) 0.5

2) d) ppm