WBBSE Solutions For Class 8 School Science Chapter 2 Element Compound And Chemical Reaction Nature Of Matter Review Questions

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Chapter 2 Element Compound and Chemical Reaction Nature Of Matter MCQs

Question 1. Carbon monoxide is

  1. A basic oxide
  2. A neutral oxide
  3. An acidic oxide
  4. An amphoteric oxide

Answer: 1. A basic oxide

Question 2. Blue vitriol is

  1. ZnSO4.7H2O
  2. CusO4.5H2O
  3. FesO4.7H2O
  4. Na2CO3. 10 H2O

Answer: 2. CusO4.5H2O

Question 3. Naphthalene and camphor can be identified

  1. By their odour
  2. By their colour
  3. By their taste
  4. By their structure

Answer: 1. By their odour

WBBSE Class 8 Nature of Matter review questions

Question 4. Which one of the following is a chemical change?

  1. Dissolving common salt in water
  2. Rusting
  3. Melting of wax
  4. Freezing of water

Answer: 2. Rusting

Question 5. One of the characteristic properties of metal is

  1. Brittleness
  2. Good conductor of heat and electricity
  3. Forms acidic oxide
  4. dull appearance

Answer: 2. Good conductor of heat and electricity

Question 6. Which one of the following is a non-metal?

  1. Tungsten
  2. Sulphur
  3. Titanium
  4. Iron

Answer: 2. Sulphur

Question 7. Which one of the following has magnetic properties?

  1. Iron
  2. Copper
  3. Aluminium
  4. Zinc

Answer: 1. Iron

Review questions on elements and compounds for Class 8

Question 8. Which one of the following gases is odourless?

  1. Ammonia
  2. H2S
  3. Oxygen
  4. Ozone

Answer: 3. Oxygen

Question 9. The gas has a smell of rotten eggs is

  1. H2S
  2. Nh3
  3. Chlorine
  4. Ozone

Answer: 1. H2S

Question 10. When heated, solid iodine

  1. Sublimes
  2. Melts
  3. Boils
  4. Ionizes

Answer: 1. Sublimes

Read And Learn More WBBSE Solutions For Class 8 School Science Review Questions

Question 11. The metalloids are

  1. Fe, al
  2. As, sb
  3. Cl, Br
  4. Ar, ne

Answer: 2. As, sb

Question 12. The metal which does not produce hydrogen gas when reacts with H2C is

  1. Al
  2. Cu
  3. Zn
  4. Fe

Answer: 2. Cu

Question 13. Which one of the following metals is chemically most inert?

  1. Fe
  2. Au
  3. Cu
  4. Na

Answer: 2. Au

WBBSE Chapter 2 nature of matter answers

Question 14. The substance having a characteristic odour is

  1. Silver
  2. Water
  3. Kerosene
  4. None of these

Answer: 3. Kerosene

Question 15. The metal which reacts explosively even with cold water is

  1. Sodium
  2. Iron
  3. Calcium
  4. Aluminium

Answer: 1. Sodium

Question 16. Water and glycerin can be distinguished

  1. By touching
  2. By their odour
  3. By their colour
  4. Their magnetic properties

Answer: 1. By touching

Question 17. The substance which does not sublime is

  1. Naci
  2. Nh cl
  3. Iodine
  4. Camphor

Answer: 1. Naci

Question 18. The order of melting point for the following metals is

  1. Fe>au>ai
  2. Fe>ai>au
  3. Au<fe<ai
  4. Al > au > fe

Answer: 1. Fe>au>ai

Nature of matter concepts summary and review questions for Class 8

Question 19. If a very thin sheet of metal is required in an experiment, then which of the following is to be taken?

  1. Zn
  2. Cu
  3. Fe
  4. Au

Answer: 4. Au

Question 20. An example of a metal which can be easily cut by a sharp knife is

  1. Sodium
  2. Iron
  3. Titanium
  4. Copper

Answer: 1. Sodium

Question 21. Which one is a neutral oxide?

  1. Calcium oxide
  2. Carbon dioxide
  3. Zinc oxide
  4. Carbon monoxide

Answer: 4. Carbon monoxide

Question 22. Four test tubes contain four different types of salt solutions. Strips of zinc metal are added to each solution in the four test tubes. In which cases there will be a visible colour change occurring in the test tubes?

WBBSE Solutions For Class 8 Chapter-2 Element, compound and chemical reaction sec-1 Nature of matter test tudes

  1. I & ii
  2. I& IV
  3. II & III
  4. III & IV

Answer: 4. III & IV

WBBSE Class 8 Science practice review questions on elements and compounds

Question 23. An element e reacts with water to form a solution which turns the phenolphthalein solution pink. The element e is most likely to be

  1. S
  2. Ca
  3. C
  4. Ag

Answer: 4. Ag

Question 24. Maximum intermolecular forces of attraction exist in

  1. Bromine
  2. Air
  3. Mercury
  4. Copper

Answer: 4. Copper

Question 25. Which among the following pairs possesses low melting points?

  1. Magnesium, mercury
  2. Iron, copper
  3. Sodium, potassium
  4. Calcium, manganese

Answer: 3. Sodium, potassium

Chapter 2 Element Compound And Chemical Reaction Fill In The Blanks

Question 1. _________ helps in the transport of oxygen Within Muscles.
Answer: Myoglobin

Question 2. Lack of _________ causes diabetes.
Answer: Insulin

Question 3. Concentrated sulphuric acid is slowly added to water. This is an example of _________ change.
Answer: Exothermic

Question 4. Ammonium chloride is dissolved in water. This is an example of_________ change.
Answer: Endothermic

Question 5. _________ is a non-metal but good conductor of electricity.
Answer: Graphite

Question 6. In general, metals are _________ conductors of heat and electricity.
Answer: Good

Question 7. The colour of nitrogen dioxide is _________.
Answer: Brown

Question 8. _________ is a metal which has a low melting point.
Answer: Gallium

Question 9. Rusting occurs due to a reaction between iron and _________ air.
Answer: Moist

Question 10. Oxygen is transported through the blood by _________
Answer: Haemoglobin

Question 11. If solid naphthalene is heated it _________.
Answer: Sublimes

Examples of nature of matter review questions for Class 8

Question 12. _________ is a metal which is liquid at room temperature.
Answer: Mercury

Question 13. _________ is used for preparing pencils.
Answer: Graphite

Question 14. _________ is a metalloid.
Answer: Arsenic

Question 15._________ ion helps in the conduction of nerve impulses from one nerve cell to another.
Answer: Ca2+

Question 16. When a piece of zinc is added to dilute Sulphuric acid, _________ gas is produced.
Answer: Hydrogen

Question 17. Carbon dioxide is _________ oxide
Answer: Acidic

Question 18. Magneslurrr oxide is _________ oxide.
Answer: Basic

Question 19. When sulphur is burnt in oxygen _________ is produced.
Answer: Sulphur Dioxide

Question 20. _________ and _________ play a crucial role in maintaining the w&tfer balance in the human body.
Answer: Na+ ,K+

Question 21. _________ ion plays an important role in the coagulation of blood.
Answer: Ca2+

Question 22. _________ ion plays a significant role in the process of maturation of RBC in the bone marrow.
Answer: Cobalt

Question 23. _________ magnesium and phosphorous are responsible for the mechanical strength of our teeth and bones.
Answer: Calcium

Question 24. When distilled water is added to magnesium oxide and then a piece of _________ litmus paper is dipped in that solution, it turns is a metalloid.
Answer: Red, Blue

Question 25. When CO2 gas is bubbled through water for sometime andrtHerrarptiece of _________ litmus paper is dipped In that solution, it turns.
Answer: Blue, red

Question 26. _________ ion helps in the conduction of nerve impulses from one nerve cell to another. When a piece of zinc is added to dilute
Answer: Zn2+

Chapter 2 Element Compound And Chemical Reaction Nature Of Matter Identify As True Or False

 

Question 1. In general, metals are good conductors of heat and electricity.
Answer: True

Question 2. The intermolecular attractive forces are highest in the case of solids.
Answer: True

Question 3. When heated at 1 atmospheric pressure, solid iodine becomes liquid.
Answer: False

Question 4. The iodine vapour is violet-coloured.
Answer: True

Question 5. When sulphur is burnt in oxygen sulphur dioxide gas is produced.
Answer: True

Question 6. Hydrogen sulphide gas has a sweet smell.
Answer: False

Question 7. The melting point and boiling point of non-metals are generally lower than that of metals.
Answer: True

Question 8. Sodium chloride is soluble in petrol.
Answer: False

Question 9. Cobalt has no magnetic properties.
Answer: False

Question 10. Bromine is a liquid at room temperature.
Answer: True

WBBSE Chapter 2 exercises review solutions on nature of matter

Question 11. The colour of chlorine gas is greenish-yellow. When strongly heated, sugar becomes black. In general, metal oxides are basic and oxides of non-metals are acidic.
Answer: True

Question 12. The melting point of a solid does not depend on pressure.
Answer: True

Question 13. Copper is a good conductor of heat and electricity.
Answer: True

Question 14. Carbon monoxide is a neutral oxide. Graphite and diamond are both good conductors of electricity.
Answer: False

Question 15. The colour of nitrogen dioxide is brown.
Answer: True

Question 16. At room temperature, magnesium metal does not react with water.
Answer: True

Question 17. Erosion of bone joints is initiated due to loss of acid-base equilibrium.
Answer: False

Question 18. The colour of nitrogen dioxide is brown.
Answer: True

Question 19. At room temperature, magnesium metal does not react with water.
Answer: True

Question 20. Erosion of bone joints is initiated due to loss of acid-base equilibrium.
Answer: True

Chapter 2 Element Compound And Chemical Reaction Nature Of Matter Match The Columns

1.

Column – A Column-B
A. Bromine 1. Silver-coloured liquid
B. Mercury 2. Red-coloured liquid
C. Nitrogen dioxide 3. Pungent-smelling gas
D. Ammonia 4. Brown-coloured gas

Answer: A-2, B-1,C-4,D-3  

2.

Column A Column B 
A. Na+ and k+ 1. Storge and stabilisation of insulin
B. Ca2+ and k+ 2. transport of oxygen
C. haemoglobin and myoglobin 3. Functioning of cardiac muscle
D. Zn2+ 4. Maintain water balance

Answer: A-4, B-3,C-2,D-1

3.

Column A Column B
A. Chlorine 1. Smells and slippery
B. Sulphur 2. Slippery
C. Hydrogen sulphide 3. greenish-yellow gas
D. Glycerin 4. Yellow-coloured solid

Answer: A-3, B-4,C-1,D-2  

4. 

Column A Column B 
A. Gold 1. Soft and slippery
B. Diamond 2.  Blue colured solid
C. Graphite 3. Soft and malleable
D. CuSO4.5H2O 4. Bad conductor of electricity

Answer: A-3, B-4,C-1,D-2 

5.

Column A Column B
A. H2SO4 added to water  1. Endothermic Oxide
B. NH4Cl added to water  2.  Amphoteric Oxide
C. AL2O3 3.  Exothermic
D. MgO 4. Basic oxide

Answer: A-3, B-1,C-2,D-4

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