Question

The gas Y is colourless having a slightly sour taste and is a minor component of
air. It is moderately soluble in water. This gas does not supports burning. It
extinguishes a burning fire. We feel suffocated due to the accumulation of this gas
in excess in the air of the room which is produced by the burning material. Green
plant needs this gas to make food.
13(i) Identify gas Y.
(a) Oxygen (b) Nitrogen
(c) Carbondioxide (d) None of these

13(ii) In what percentage, gas Y is added to the air?
(a) 0.03% (b) 1%
(c) 78% (d) 20%
13(iii) Ways in which gas Y is added to the air are:
(a) respiration of living things (b) burning of fuels
(c) both a and b (d) none of these
13(iv) Why is gas Y necessary for existence of life?
(a)food is prepared by plants using this gas
(b) helps in burning of food to release energy .
(c) both a and b

(d)non supporter of burning
13(v) The gas Y is a/an
(a) Element (b) Compound
(c) Homogenous mixture (d) Heterogenous mixture

Answer 1

Answer:

The gas Y is colourless having a slightly sour taste and is a minor component of

air. It is moderately soluble in water. This gas does not supports burning. It

extinguishes a burning fire. We feel suffocated due to the accumulation of this gas

in excess in the air of the room which is produced by the burning material. Green

plant needs this gas to make food.

Answer 2

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: ... Evidence. Experiment and/or observation as benchmarks for testing hypotheses.

Explanation:

hope it's helpful,,

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