METAL AND NONMETAL

Properties of substances W, X, Y and Z are listed below:

W: A liquid metal

X:A liquid non-metal

Y: Gaseous non-metal

Z: A non-metal which conducts electricity.

• Iron, iodine, hydrogen and oxygen

• Gold, sulphur, chlorine and hydrogen

• Copper, phosphorus, nitrogen and carbon

• Mercury, bromine, oxygen and graphite.

An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube.When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be

• Sodium

• Potassium

• Iron

• Calcium

Substance X reacts with dilute HCI violently, V reacts slowly while Z does not react at all. X, Y and Z could be respectively

• Cu, Al, Fe

• Al, Na, Cu

• Na, Cu, Fe

• K, Al, Cu

Which of the following reactions are possible?(i) Mg+CuSO4→MgSO4+Cu

(ii) Ca+MgSO4→CaSO4+Mg

(iii) Cu+ZnSO4→CuSO4+Zn

(iv) Fe+MgSO4→FeSO4+Mg

• (iii) and (iv) only

• (i) and (iv) only

• (ii) and (iii) only

• (i) and (ii) only

Match column I with column II and select the correct option from the codes given below.

Column I Column II

A non-metal,essential for respiration (i) Graphite

A non-metal, the source of energy in Sun (ii) Silicon

A non-metal, good conductor of electricity (iii) Oxygen

A non-metal, used in semiconductors (iv) Hydrogen

• (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

• (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii)

• (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv)

• (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

Which of the following statements is incorrect?

• Gold and silver are the most malleable and ductile metals.

• All metals are hard and strong.

• Mercury and gallium are metals which exist in liquid state at room temperature.

• Most of the metals have high specific gravities.

What will happen if you keep a solution of copper sulphate in an iron container for a few days? What is the reason for your observation?

• The surface of iron container will develop a green layer due to corrosion caused by copper sulphate.

• Copper metal will be deposited in iron container since copper is more reactive than iron.

• Nothing will happen since no reaction takes place between copper sulphate and iron.

• Holes will be formed in the container since iron is more reactive than copper hence iron displaces copper from a solution of copper sulphate.

Kanika takes a burning substance and collects the evolved vapours in a test tube, making sure that they do not escape.A small amount of water is added to the test tube. To the solution obtained, a few drops of blue litmus solution are added. The litmus solution turns red. Which of the following could be the burning substance?

• Mg

• S

• Na

• Fe

Read the following statements carefully and identify X, Y and Z respectively.

(i) X is stored under kerosene.

(ii) Y catches fire on exposure and stored in water.

(iii) Z reacts with steam.

• Na, Mg, Cu

• Na, P, Fe

• Cu, Zn, K

• Zn, Cu, Na

Statement 1: Silver objects become green and lose their shine with the passage of time.

Statement 2: Silver reacts with carbon dioxide and moisture present in the atmosphere.

• Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

• Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

• Statement 1 is true and statement 2 is false.

• Both statements 1 and 2 are false.