_____________causes Leucoderma, skin cancer.
Nickel
Chromium
Cadmium
Uranium
Oxides of potassium, sodium and calcium dissolve in water to form
Hydrogen
oxygen
alkalies
acids
Which is used to produce hydro electricity in dams and electricity in rural power plants and nuclear plants?
waves
wind
water
nuclear reactor
Rain water and distilled water are examples of
liquid oxygen
soild carbondioxide
hard water
soft water
Which couple is used for reducing a large number of organic compounds?
zinc - mercury
Iron-silver
mercury-silver
iron-mercury
In a pressure cooker the increased pressure ________ the boiling point of water.
Decreases
Increases
First increases then decreases
First decreases then increases
Which is a mixture of iron and steel with silicates?
Oil paints
coal tar
plastic coating
enamel coating
Which lathers easily with soap?
____________in the air provides moisture for the growth of both plants and animals.
Nitrogen
Water vapour
Carbondioxide
Oxygen
Which causes kidney, pulmonary and skeletal diseases?
uranium
chromium
cadmium
tin
