Some Gases || Solved Q/A for S.E.E. - Exam || Part-1

By Pravin Keshari -

SOME GASES

Part-1 

Very short questions and answers for S.E.E. students

Some Gases

Questions and answers to practice for S.E.E. examination


1) Write down the molecular formula and molecular weight of carbon dioxide.
Answer: The molecular formula of carbon dioxide is CO₂ and its molecular weight is 44 a.m.u.


2) By which property of carbon dioxide it helps to extinguish the fire?
Answer: Carbon dioxide is heavier than air. This property of carbon dioxide helps to extinguish fire.


3) Write the chemical formula of lime water.
Answer: The chemical formula of lime water is Ca(OH)₂.


4) Name the chemicals that are kept in the fire extinguisher.
Answer: The chemicals that are used in fire extinguisher are conc. sulphuric acid (H₂SO₄) and sodium bicarbonate (NaHCO₃).


5) What is dry ice? Write its one use.
Answer: The ice obtained by cooling CO₂ gas at about -78⁰C is called dry ice.


6) Which gas is obtained by reacting lime stone and dilute hydrochloric acid.
Answer: Carbon dioxide gas is obtained by reacting lime stone and dilute hydrochloric acid.


7) What happens when a balloon filled with carbon dioxide is left free in the air?
Answer: The balloon filled with carbon dioxide gas comes down and remains on the surface of earth because this gas is heavier than air.


8) Name two chemicals which are required to prepare carbon dioxide gas in laboratory.
Answer: The two chemicals required to prepare carbon dioxide gas in laboratory are:
            (i) Calcium carbonate (Marble pieces) and
            (ii) Dilute hydrochloric acid.


9) Write any two physical properties of carbon dioxide.
Answer: Any two physical properties of carbon dioxide are as folllows:
        (i) Carbon dioxide is colorless, odorless and tasteless gas.
        (ii) It turns wet blue litmus paper into red.


10) Which gas is formed when calcium carbonate is treated with hydrochloric acid?
Answer: Carbon dioxide gas is formed when calcium carbonate is treated with hydrochloric acid.


        More questions will be given in another blog post.

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