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Important CHEMISTRY Questions


1- Gases used in welding are ?

Acetylene & Oxygen


2- Gases used by sea divers for breathing are ?

Oxygen & Helium


3- Best sources for Vitamin D are?

Sunlight & Fish liver


4- Zinc Phosphide is used as?

Rat Poison


5- Fuse wire is made up of

Lead and Tin


6- Purest form of Iron is?

Wrought Iron


7- Radium is extracted from?

Pitchblende


8- Which agent is as ‘seed’ in artificial rain?

Silver Iodide


9- Oxides of metals are ?

Alkaline


10- During the process of ‘rusting’ , the weight of iron ?

Increases


11- (metal) is liquid at room temperature?

Gallium


12- What is the formula of common salt ?

NaCl


13- What is the maximum number of electrons that a p-orbital can hold ?

6


14- What is used in fire extinguisher?

Sodium bicarbonate


15- What is the nature of metal oxides ?

Basic


16- Which gas burns with popping sound ?

Hydrogen


17- Which metal is used for galvanization ?

Zinc


18- What is the nature of bleaching powder ?

Oxidising agent


19- Which is stored in Kerosene ?

Sodium


20- Phenolphthalein gives which color in acidic medium ?

Colourless


21- Which gas is used in cigarette lighters?

Butane


22- Biogas chiefly contains ?
Methane (CH4)

23- Chemical used as fixer in Photography is ?

Sodium thiosulphate


24- Aspirin is ?

Acetyl Salicylic Acid


25- Is also known as ‘Stranger Gas’ ?

Xenon


26- Natural rubber is a polymer derived from ?

Isoprene

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