1. The metal that melts even when kept on the palm is ?

Cobalt

Mercury

Nickel

Gallium

Answer: Mercury

Explanation:


2. The stainless steel is an alloy of ?

Nickel and chromium

Iron, nickel and chromium

Iron and chromium

Iron and nickel

Answer: Iron, nickel and chromium

Explanation:


3. Which of the following property is generally not shown by metals ?

Electrical conduction

Ductility

Sonorous in nature

Dullness

Answer: Dullness

Explanation:

Metals generally do not show dullness. Metals such as gold and silver usually are shiny rather than dull.


4. During electrolytic refining of zinc, it gets ?

Remains in the solution

Deposited on cathode as well as anode

Deposited on cathode

Deposited on anode

Answer: Deposited on cathode

Explanation:

During electrolytic refining of zinc, it gets deposited on cathode. Since, zinc ions are positively charged, it gets deposited at the negatively charged cathode


5. Silver articles become black on prolonged exposure to air. this is due to the formation of ?

Ag3N

Ag2S and Ag3N

Ag2O

Ag2S

Answer: Ag2S

Explanation:

Silver articles turn black after prolonged exposure to air due to the reaction of sulphur present in air. Silver reacts with sulphur to form dark grey to black silver sulphide.


6. Which non-metal is the best conductor of electricity ?

Bromine

Graphite

Phosphorus

silicon

Answer: Graphite

Explanation:


7. The lightest liquid metal is ?

Fr

Cs

Ga

Hg

Answer: Cs

Explanation:


8. Non-metals form covalent chlorides because ?

they cannot share electrons with chlorine atoms

they can give electrons to chlorine

they can give electrons to chlorine atoms to form chloride ions

they can share electrons with chlorine

Answer: they can share electrons with chlorine

Explanation:


9. Which of the following non-metal is lustrous ?

Nitrogen

Oxygen

Iodine

Sulphur

Answer: Iodine

Explanation:


10. Which of the following is purest form of carbon ?

Fullerene

Charcoal

Diamond

Graphite

Answer: Fullerene

Explanation: