Materials: Metals and non-metals Worksheet-3

Materials: Metals and non-metals Worksheet-3

21. Which of the following does not react with acids?

A. Cu                   B. Ni                    C. Cr                    D. O

22. Which one of the following gas burns with the "pop" sound?

A. Oxygen                                       B. Hydrogen

C. Chlorine                                     D. Hydrogen sulphide

23. Which of the following statements are correct?

A. All metals are ductile

B. All non metals are ductile

C. Generally metals are ductile

D. some metals are ductile

24. What happens when dilute sulphuric acid is poured on a copper plate?

A. Copper sulphate formed        B. Zinc sulphate formed

C. Copper chloride formed        D. Zinc sulphate formed

25. On burning metals react with oxygen to produce-

A. Metal hydroxide                      B. Metal chloride

C. Metal oxide                               D. Metal sulphate

26. Which gas produced when wood is burnt in excess of oxygen?

A. CO₂                B. CO                  C. H₂S                D. O₂

27. Which gas is produced by burning charcoal?

A. CO, CO₂        B. CO                  C. CO_­2                D. H₂

28. Non metals are used in-

A. Aeroplanes                               B. making machinery

C. Water boilers                           D. Fertilizers

29. Which of the following is applied on wounds as an antiseptic?

A. Metals                                        B. Non metals

C. Metalloids                                 D. All of these

30. Which metal is found in plants?

A. Fe                   B. Cr                    C. Mg                  D. CO

Answer:

21. D

Explanation: Oxygen is a non metal hence it does not react with acids.

22. B

Explanation: Hydrogen burns with a pop sound.

23. C

Explanation: All metals are not ductile and malleable. For example : Sodium, potassium, mercury and some other metals are not malleable and ductile.

24. A

Explanation:

In the absence of air copper does not react with dil. Sulphuric acid or dil. Hydrochloric acid. In the presence of air copper sulphate is formed when copper is treated with dil. sulphuric acid.

25. C

Explanation:

Metals when burnt in oxygen produce their oxides.

26. A

Explanation: When wood is burnt in excess of oxygen carbon di oxide is produced.

27. A

Explanation: If charcoal is burnt in sufficient oxygen, carbon dioxide CO₂ will be produced. 
If burnt with insufficient oxygen, then carbon monoxide, CO, will be produced.

28. D

Explanation: Non metals like nitrogen, phosphorous, sulphur etc. are used in making fertilizers.

29. B

Explanation: Iodine is a non metal present in tincture iodine which is an antiseptic. It is also called weak iodine solution. Usually 2–7% elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol and water.

30. C

Explanation: Magnesium is found in chlorophyll green pigment present in chloroplast.