Water Properties Quiz Unit 1 L4

What is the structure of a water molecule?

• Two oxygen atoms and two hydrogen atoms

• Two oxygen atoms and one hydrogen atom

• One oxygen atom and two hydrogen atoms

• One oxygen atom and one hydrogen atom

What type of attraction originates between polar water molecules?

• Metallic bond

• Hydrogen bond

• Covalent bond

• Ionic bond

In which state does water exist at room temperature?

What happens to the density of water when it freezes?

• It increases

• It remains the same

• It decreases

• It becomes zero

What gas evolves at the cathode during the electrolysis of water?

• Oxygen

• Hydrogen

• Carbon dioxide

• Nitrogen

What is the effect of pure water on litmus paper?

• It turns red litmus paper blue

• It turns blue litmus paper red

• It has no effect on either

• It turns both red and blue litmus papers blue

What is the main source of biological pollution in water?

• Factories wastes

• Chemical insecticide

• Human and animal wastes

• Leakage of petroleum oil

What is the main source of thermal pollution in water?

• Discharging of factories wastes

• Leakage of radioactive substances

• Burning coal and oil

• Rise of temperature due to nuclear reactors

What disease can be caused by biological pollution in water?

• Blindness

• Liver cancer

• Typhoid

• Brain cell death

What is the effect of arsenic in water on health?

• Causes typhoid

• Leads to brain cell death

• Causes blindness

• Increases the rate of infection by liver cancer