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Some Basic Concepts of Chemistry

Multiple Choice Questions

631.

If molecular weight of KMnO₄ is M, then its equivalent weight in acidic medium would be

632.

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

40 L
60 L
80 L
100 L

633.

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

634.
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.

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