Q.1: Which of the following can be beaten into thin sheets?
Q.2: Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.
Q.3: Fill in the blanks.
(a) Phosphorus is a very________ non-metal.
(b) Metals are _________ conductors of heat and ________ .
(c) Iron is ___________ reactive than copper.
(d) Metals react with acids to produce _________ gas
Q.4: Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) Generally, non-metals react with acids.
(b) Sodium is a very reactive metal.
(c) Copper displaces zinc from zinc sulphate solution.
(d) Coal can be drawn into wires
Q.5: Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.
Q.6: Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene
Q.7: Can you store lemon pickle in an aluminium utensil? Explain.
Q.8: Match the substances given in Column A with their uses given in Column B :
Q.9: What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution? Write word equations of the reactions involved.
Ans : (a) When dilute sulphuric acid is poured on a copper plate, the copper metal reacts with sulphuric acid to liberate hydrogen gas. (b) Iron being more reactive displaces copper from copper sulphate solution. In this reaction, the blue colour of copper sulphate fades and there is deposition of copper on the iron nail.
Q.10: Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas ? (b) Write down word equations of all the reactions taking place in this process