The percentage of carbon dioxide in exhaled air is ………
A) 44
B) 4.4
C) 0.4
D) 0.04
1 Answers
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Who demonstrate that photosynthesis is light dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carboh
Correct Answer - C.V. Niel
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(i) Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentage of carbon in chalk. (ii) If in a stick of chalk, carbon is 3g,
Correct Answer - (i) 12% (ii) 25g
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Statement I : When carbon dioxide passes through lime water it will turn into milky. Statement II : When excess of carbon dioxide
A) Both statements are true
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Which part of the plant takes in carbon dioxide from the air for photosynthesis?
Answer is (B) Stomata
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Agents present in exhaled air:
C) CO2 , water vapour
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a. Why is Carbon -14 radioactive while Carbon -12 not? (Atomic number of Carbon: 6) b. Researchers have uncovered the youngest known
(a) Ratio of neutrons to protons is 2.3: 1 which is not the stable ratio of 1:1 (b) Age of fossils can be estimated by C-14 decay. All living organisms have...
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There are 3 isotopes of carbon. Carbon-12, Carbon-13 and Carbon-14. The most abundant carbon isotope is carbon – 12.
Correct option is A) 12.01
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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Carbon found nature as a mixture of C-12 and C-13. The average atomic mass of carbon is 12.011u. What is the percentage abundance of carbon-12 in natu
Correct Answer - `98.9%`
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Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?
CO combines with haemoglobin to forms a complex entity, carboxyhaemoglobin which is about 300 times more stable than oxyhaemoglobin. In blood, when the concentration of carboxyhaemoglobin reaches 3 -4%, the oxygen-carrying...
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