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Q301

Colour imparted to the Bunsen flame by strontium salt is

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Q302

An oxidising agent is a

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Q303

Silver gets corroded due to ________ in air.

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Q304

Which of the following causes the rusting of iron?
a. Oxidation
b. Reduction
c. Chemical reaction with oxygen
d. Chemical reaction with CO²

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Q305

Photo-oxidation process is initiated by

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Q306

Copper substances when exposed to air gains a green coating due to the formation of:

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Q307

Browning of paper in old books is caused by

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Q308

Catalyst is a substance which

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Q309

When quick lime is added to water

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Q310

What is the element that is in the highest percentage in the composition of the earth ?

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Q311

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

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Q312

Which one element from below list is liquid at room temperature?

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Q313

Which among the following elements is found in maximum percentage in the human body ?

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Q314

Iodine can be separated from a mixture of Iodine and Potassium Chloride by

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Q315

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:

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Q316

Which one among the following is not a mixture?

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Q317

The gas used to dilute oxygen for breathing by deep sea divers is:

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Q318

The most abundant element in the human body is

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Q319

The most abundant element in the earth’s atmosphere is

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Q320

Select the one which is not a mixture :

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