Foundation Level III JEE Mock Test-7(Chemistry)

Goldsmith uses_____part of the flame for melting gold.

• Middle

• Innermost

• Outermost

• None of these

• Sodium bicarbonate

• Sodium sulphate

• Calcium sulphate

• None of these

Water is not suitable in fire extiguishing involves fires-

• In case of oil

• In case of Petrol

• In case of electric current

• All of these

Petrol engines gives off gaseous oxides of______

• Sulphur

• Phosphorous

• Nitrogen

• Carbon

 Which substance give heat and light after combustion:

    

• Flame

• Fuel

• Combustion

• None of these

 Burning of charcoal in a closed room will produce_______

    

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• All of these

The substances which have very low ignition temperature will:

      

• Catch fire easily

• Will not catch fire

• Catch fire after some time

• None of these

 CNG and LPG are the examples of________

    

• Solid fuels

• Liquid fuels

• Gaseous fuels

• None of these

Calorific values gives the ______

• Amount of heat

• Fuel efficiency

• Amount of light

• None of these

Unburnt carbon particles causes__________

• Stomach infections

• Brain infections

• Respiratory problems

• Throat problems