MCQ on Materials: Metals and Non-metals

CBSE/NCERT 8th Class MCQ CBSE/NCERT 8th Class MCQ on Science

21. Greenish deposit layer on the surface of the copper vessel is due to

(A) Corrosion

(B) Compound

(C) Reaction

(D) None of the above

 

22.What is the name of the product formed in the reaction of sulphur and oxygen?

(A) Sulphur hydroxide

(B) Sulphur dioxide

(C) Sulphate dioxide

(D) sulphur monoxide

 

23. When sulphur dioxide is dissolved in water ………………..is formed.

(A) Sulphuric acid

(B) Sulphur hydroxide

(C) Sulphurous acid

(D) None of the above

 

24. The formation of rust on the surface of iron objects or structure due to moisture containing atmosphere is called

(A) Rusting of zinc

(B) Rusting of copper

(C) Rusting of iron

(D) None of the above

 

25. When a substance cannot be broken down further by chemical reactions by which cooling, heating or by electrolysis. It is called

(A) Metal

(B) Element

(C) Non-metals

(D) Substance

 

26. The smallest unit of an element is called

(A) Atom

(B) Element

(C) Substance

(D) None of the above

 

27. Metals which react with bases produce

(A) Hydrogen gas

(B) Oxygen gas

(C) Nitrogen gas

(D) Salt and water

 

28. Metals which react with acids produce

(A) Water and nitrogen gas

(B) Salts and hydrogen gas

(C) Nitrogen and oxidation

(D) None of the above

 

29. Metals which react with water produce

(A) Metal hydroxide and oxygen

(B) Metal hydroxide and carbon gas

(C) Metal hydroxides and hydrogen gas

(D) None of the above

 

30. On burning metal reacts with oxygen to produce

(A) Metal acidic

(B) Metal hydroxide

(C) Metal oxidates

(D) Metal oxides

 

Answers:-

21-(A) 22-(B) 23-(C) 24-(C) 25-(B) 26-(A) 27-(A) 28-(B) 29-(C) 30-(D)