Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Some Basic Concepts of Chemistry

Multiple Choice Questions

121.

The volume of oxygen necessary for the complete combustion of 20 L of propane is :

40 L
60 L
80 L
100 L

122.

A gaseous mixture contains 56 g of N₂, 44 g of CO₂ and 16 g of CH₄. The total pressure of mixture is 720 mm of Hg. The partial pressure of methane is :

75 atm
160 atm
180 atm
215 atm

123.
20 volume H₂O₂ solution has a strenght of about

30%

6%

3%

10%

20 volumes of H₂O₂ means 20 L of oxygen is obtained at STP by the decomposition of 1L H₂O₂ solution

$\underset{2 mol}{2 H_{2} O_{2}} \to 2 H_{2} O + \underset{1 mol}{O_{2}} 68 g 22.4 L at STP$

22.4 L oxygen is obtained from 68g H₂O₂.

$20 L oxygen is obtained from = \frac{68}{22.4} \times 20 = 60.7 g H_{2} O_{2} 1000 mL of H_{2} O_{2} solution contain 60.7 g H_{2} O_{2} 100 mL (\approx 100 g) solution conatins \frac{60.7}{1000} \times 100 strenght of H_{2} O_{2} solution = 6.07 g H_{2} O_{2} = 6.07 %$

124.

74.5 g of a metallic chloride contains 35.5 g of chlorine, the quivalent weight of the metal is

19.5
35.5
39
78.0

Previous Year Papers

Test Series

Test Yourself

Multiple Choice Questions

123. 20 volume H2O2 solution has a strenght of about 30% 6% 3% 10%

123.
20 volume H₂O₂ solution has a strenght of about

30%

6%

3%

10%