In a pressure cooker the increased pressure ________ the boiling point of water.
Decreases
Increases
First increases then decreases
First decreases then increases
Which lathers easily with soap?
hard water
liquid oxygen
soft water
soild carbondioxide
Magnesium, zinc and iron react with steam to form the corresponding metal oxide and liberate
Hydrogen
oxygen
water
hydrogen peroxide
What is the process of production of soft water from hard water by the use of suitable methods?
hardening of water
softening of water
purification of water
water of crystallisation
_____________showed water to be a compound consisting of two hydrogen atoms and one oxygen atom.
Henry cavendish
Rutherford
Joseph priestley
Antoine lavoisier
____________in the air provides moisture for the growth of both plants and animals.
Nitrogen
Water vapour
Carbondioxide
Oxygen
______________is lighter than water.
Sugar
Salt
Ice
Stone
Which is used in photosynthesis?
hydrogen
carbon monoxide
The electrode connected to the positive end of the battery is called
Anode
Cathode
Electrode
Electrolyte
Which regulates the temperature of the body by the process of sweating and evaporation?
carbon dioxide