Fill in the blanks with appropriate words: (dust, atmosphere, mixture, motion, dissolved, oxygen).

1. Air is not one substance but a ……………………..
2. When air is in ………………. it is called wind.
3. Our earth is surrounded by ………………………...
4. The aquatic animals use ………………. oxygen in the water for respiration.
5. Air contains ………………… particles.
6. The component of air that supports burning is called …………………

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Solution

1. Air is not one substance but a mixture.
2. When air is in motion it is called wind.
3. Our earth is surrounded by an atmosphere.
4. The aquatic animals use dissolved oxygen in the water for respiration.
5. Air contains dust particles. The component of air that supports burning is called oxygen.

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Assertion : For drying $H_{2} S$ , Conc. $H_{2} S O_{4}$ cannot be used.

Reason: Moist $H_{2} S$ is oxidized by Conc. $H_{2} S O_{4}$

The correct statement with regard to $H_{2}^{+}$ & $H_{2}^{-}$ is

C O_{2}, H_{2}

H_{2} S

R e a c t i o n \Rightarrow R e a c t a n t 1 + R e a c t a n t 2 \to P r o d u c t 1 + P r o d u c t 2

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