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CHEMISTRY [1 Mark Question Answer]

Hydrogen · ICSE STD 8 (ICSE - English Medium). 5 questions.

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[1 Mark Question Answer]

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5 questions · timed · auto-graded

Question 11 Mark
The gas which has now replaced hydrogen in air balloons $.........$ is $[$largon, helium, neoni$]$
Answer
The gas which has now replaced hydrogen in air balloons is helium.
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Question 21 Mark
The product formed on combustion of hydrogen in air is $......... [$water gas, water, producer gas$]$.
Answer
The product formed on combustion of hydrogen in air is water.
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Question 31 Mark
A foul smelling gas formed when hydrogen reacts with a molten non$-$metal, is $......... [$hydrogen chloride, hydrogen sulphide, ammonia$].$
Answer
A foul smelling gas formed when hydrogen reacts with a molten non-metal, is hydrogen sulphide $\text{[H2S]}.$
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Question 41 Mark
In Bosch process the catalytic reduction of steam to hydrogen is carried out by. $\left[\ce{CO_2, CO , C }\right]$
Answer
In Bosch process the catalytic reduction of steam to hydrogen is carried out by $CO [$carbon monoxide$]$.
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Question 51 Mark
The acid $[$dil. $\ce{H_2SO_4}$, dil. $\ce{HNO_3}$, dil. $\left.HCl \right]$ is not used in the laboratory preparation of hydrogen, using zinc and an acid.
Answer
The acid dil. $\ce{HNO_3}$ is not used in the laboratory preparation of hydrogen, using zinc and an acid.
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[1 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip