33. NCERT Exemplar VI

Exercise condition:

2 m.

1. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

Helium or nitrogen
Carbon dioxide or oxygen
Nitrogen or oxygen
Carbon dioxide or helium
Carbon dioxide or argon

2. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

\(2H_2\)(g) + \(O_2\)(l) → \(2H_2O\)(l)
\(2H_2\)(l) + \(N_2\)(l) → \(2H_2O\)(l)
\(2H_2\)(l) + \(O_2\)(l) → \(2H_2O\)(g)
\(2H_2\)(g) + \(O_2\)(g) → \(2H_2O\)(g)
\(2H_2\)(g) + \(O_2\)(g) → \(2H_2O\)(l)

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