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

W: A liquid metal

X: A liquid non-metal

Y: A gaseous non-metal

Z: A non-metal which conducts electricity

W, X, Y and Z are respectively

• Iron, Iodine, hydrogen, and oxygen.

• Gold, Sulphur, chlorine, and hydrogen

• Copper, phosphorus, nitrogen, and carbon.

• Mercury, bromine, oxygen, and graphite.

Sodium metal is kept immersed in kerosene oil because

• It is a very reactive metal.

• A lot of heat is evolved when sodium reacts with water.

• It can even react with moisture present in air violently.

• All of these.

An unknown metal X when placed in copper sulphate, 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 HCl violently, Y 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

In which of the following set-up’s reaction will take place?

i. Magnesium ribbon in copper sulphate solution.

ii. A few pieces of calcium in magnesium sulphate solution.

iii. Copper wire in zinc sulphate solution.

iv. Iron nails in magnesium sulphate solution.

• (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 given codes:

• 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 statement 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 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 as iron is more reactive than copper hence it displaces copper from its solution.

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 turns red. Which of the following could be the burning substance?

• Magnesium.

• Sulphur.

• Sodium.

• Iron.

Vidisha placed a copper wire in silver nitrate solution as shown in the figure:

Which of the following represents correct observation?

• The colour of the solution turned blue and precipitate of solid silver was obtained.

• Colour of the solution turned green and copper wire turned blue.

• There was no change in the colour of the solution of the wire.

• Colour of the solution became silver and there was no change in the colour of copper wire.