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Chemistry

Chemistry
The iron ore which contains 72% of iron is :

Siderite
Limonite
Haematite
Magnetite

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Chemistry
Which of the following is an antidiabatic drug?

Chloroquine
Penicillin
Insulin
Aspirin

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Chemistry
The metal chiefly used for galvanising iron is :

Cadmium
Tin
Mercury
Zinc

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Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Helium
Krypton
Argon
Neon

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Chemistry
Which one of the following contains maximum percentage of carbon ?

Wrought iron
Cast iron
High speed steel
Stainless steel

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Chemistry
The presence of ozone in the stratosphere is responsible for

Increasing the average global temperature in recent years
Supplying oxygen for people travelling in jets
Higher rate of photosynthesis
Checking the penetration of ultra-violet rays to the earth

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