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Chemistry

Chemistry
The gas that usually causes explosions in coal mines is

Methane
Air
Carbon monoxide
Hydrogen

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Chemistry
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :

Generator
Uninterrupted power supply (UPS)
Battery
Power transmittor

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.727
0.305
0.658
0.509

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Chemistry
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :

Galvanization
Zinc plating
Vulcanization
Alloy formation

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Chemistry
The chemical name of 'Hypo' commonly used in photography is

Silver iodide
Sodium nitrate
Silver nitrate
Sodium thiosulphate

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Chemistry
The most electropositive elements among the following is

Na
Cs
K
Ca

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MORE MCQ ON Chemistry

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