So far, more than 114 different elements have been discovered. Many of them are found in nature, while others are created artificially and are referred to as synthetic elements. They have been divided into two categories based on their properties: metals and nonmetals.
Download Class 8 Chemistry Worksheet on Chapter 4 Materials: Metals and Non-Metals Set 2 PDF
CBSE Class 8 Chemistry Chapter 4 Materials: Metals and Non Metals – Set 2
Q-1: Pure gold is _____.
a) Hard and non-ductile
b) Soft and ductile
c) Soft and non-ductile
d) Hard and ductile
Q-2: Which of the following metals can be found in both free and combined forms in nature?
a) Zinc
b) Copper
c) Lead
d) Potassium
Q-3: Which of the following metals is the least abundant in the Earth’s crust?
a) Fe
b) Al
c) Ti
d) Na
Q-4: Give reasons for the following:
a) Iron is used for roofing and for making trunks.
b) Bronze medals can develop a greenish coating if they are not properly preserved or cleaned.
c) Calcium does not occur in a free state in nature.
Q-5: Match column I with column II.
| Column I | Column II |
|---|---|
| A) Carbon | i) Food preservation |
| B) Iron | ii) Electrodes |
| C) Nitrogen | iii) Machine parts |
| D) Sulphur | iv) Manufacturing of Ammonia |
| E) Hydrogen | v) Gun powder |
Q-6: A metal M reacts with an acid according to the equation:
M + H+ → M3+ + H2
What can metal M be possible? Write the complete balanced equation.
Q-7: Fill in the blanks.
a) ________ is the non-metal which does not react with water but reacts with air.
b) Metal can be drawn into wires. This property of metal is called _______.
c) Non-metals generally do not react with ______ and ________.
d) Elements which show the property of both metals and nonmetals are called _______.
e) SO2 is an acidic oxide because it is an oxide of _______.
Q-8: A non-metal X is an important constituent of our food and forms two oxides, Y and Z. Oxide Y is highly poisonous, and Z is used in fire extinguishers. Identify X, Y and Z.
Q-9: Aluminium and oxygen combine to form _______.
a) AlO
b) AlO2
c) Al2O
d) Al2O3
Q-10: From amongst the elements, iron, phosphorous, sodium, magnesium, copper, name the metal,
a) Which does not react with hydrochloric acid even on heating.
b) Another which reacts with water slowly.
Q-11: A copper and aluminium wire was taken and fastened to the stand. After applying wax to the free end of the wire to secure a pin, the wire was heated with a burner. Answer the following:
a) What do you observe after some time?
b) Which observation will reveal the high melting point of metals?
Q-12: Identify the following:
a) A non metal is used as rocket fuel.
b) A metal hydroxide is used for degreasing metals.
c) A non-metallic acid is used for cleaning steel.
d) A non-metal used for sterilisation of water in swimming pools.
Q-13: Non-metal oxides are generally acidic in nature. Identify the one which is neither acidic nor basic but is neutral.
a) NO2
b) N2O
c) SO2
d) CO2
Q-14: Enamel on our teeth is the toughest material in our body. Chemically, what is it? Identify the metal that is in it.
Q-15: How would you differentiate between metals and nonmetals based on the following?
a) Hardness
b) Density
c) Tensile Strength
d) Sonorosity
e) Physical State
Q-16: The lustre of the metal is due to _______.
a) Its high reactivity
b) Its high density
c) Its high melting point
d) Presence of the free electrons
Q-17: Identify which of the following statements are true and false.
a) All metals form basic oxides.
b) Copper forms only one oxide with the formula CuO.
c) Activity of Zn, Na and Ag are in the order Na>Zn>Ag.
d) Copper and Aluminium are the best conductors of electricity.
e) Non-metals generally form acidic oxides.
Q-18: An alloy is called amalgam if it contains one of the metals as _______.
a) Tin
b) Zinc
c) Mercury
d) Silver
Q-19: Write word equations of the reactions involved in the following:
a) Copper turnings are placed in silver nitrate solution.
b) Sodium is dropped in water.
c) A silver plate is dipped in copper nitrate solution.
Q-20: With the following metals, metallic oxides of calcium, iron, and copper were heated. In which circumstances will you discover displacement reactions not occurring?
| Metal Oxides | Calcium | Aluminium | Copper |
|---|---|---|---|
| a) Calcium oxide
b) Aluminium oxide c) Copper oxide |
Download the PDF to access answers to the Chemistry Worksheet for Class 8 Chemistry Chapter 4 Materials: Metals and Non-Metals Set 2
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Read Also:
- Difference between Metals and Non metals
- Non Metals
- Properties of Metals and Non metals
- Chemical Properties of Metals
- Class 8 Materials Metals and Non-Metals Important Questions with Answers
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