What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?

One Line Answer

Calcium : Red litmus turns blue.

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Chapter 7 Air and Atmosphere
Exercise II | Q 6.3

Answer the question put against the following constituents of air:

Nitrogen : Explain its significance for plants and animals.

Define the term smog.

What do you observe when Ice cold water is filled in a glass tumbler.

What are fuels?

Give word equation for the following conversion:

Nitrogen of the air to nitric oxide

State four different properties of a compound and a mixture.

_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.

Analogy

Photosynthesis : _____ :: Respiration : Oxygen

______ is responsible for making clouds.

Observe the picture given in Fig. carefully and answer the following questions.

Can you comment on the air quality of the place shown in Fig?