Class 8 Science Chapter 4 MCQ. We covered all the Class 8 Science Chapter 4 MCQ in this post for free so that you can practice well for the exam.
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MCQ on General Science for Class 8 Students
Metal has………. no. of electrons in their outermost shell
(a) 1 to 8
(b) 7 to 9
(c) 1 to 3
(d) 10 to 12
Option c – 1 to 3
Which of the following gas is lighter
(a) H₂
(b) SO₂
(c) O₂
(d) NO₂
Option a – H₂
Which method is employed for obtaining a pure metal?
(a) Froth floatation
(b) Electrolytic refining
(c) Magnetic separation
(d) Gravity separation
Option b – Electrolytic refining
What happens when a mixture of powdered iron and copper (II) oxide is heated in a crucible?
(a) Iron (II) oxide and copper are formed.
(b) Copper (III) oxide and iron (II) oxide are formed.
(c) Iron (III) oxide and copper sulphate are formed.
(d) No reaction takes place.
Option a – Iron (II) oxide and copper are formed
Why is the polling process employed?
(a) For the removal of Cu₂O from Cu
(b) For the removal of Al2O2 from Al
(c) For the removal of Fe₂O3 from Fe
(d) For the removal of MgCl₂ from Mg
Option a – For the removal of Cu₂O from Cu
In which of the following is thermite welding done?
(a) Girders
(b) Railway tracks
(c) Cracked machine parts
(d) All of the above
Option d – All of the above
Identify the formula of superphosphate of lime.
(a) Ca3(PO4)2
(b) CaHPO4
(c) Ca(OH)₂
(d) Ca(H₂PO4)2H₂O
Option d – Ca(H₂PO4)2H₂O
Which of the given metals is stored under kerosene to prevent oxidation?
(a) Copper
(b) Potassium
(c) Magnesium
(d) Calcium
Option b – Potassium
Non-metals generally form
(a) Anions
(b) Cations
(c) Ions
(d) None of these
Option a – Anions
Galvanisation is a method of protecting iron from rudfing by coating it with a thin layer of
(a) Galium
(b) Aluminium
(c) Zinc
(d) Silver
Option c – Zinc
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following
(a) Mg
(b) Na
(c) P
(d) Ca
Option b – Na
The reaction between X and Y forms compound Z. X loses electrons and Y gains electrons. Which of the following properties is not shown by Z?
(a) Has a high melting point
(b) Has a low melting point
(c) Conducts electricity in a molten state
(d) Occurs as solid
Option c – Conducts electricity in a molten state
The electronic configurations of three elements X, Y and Z are X-2, 8; Y-2, 8, 7 and Z-2, 8, 2. Which of the following is correct?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Option c – Z is a non-metal
Which of the following non-metal is lustrous?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) iodine
Option d – iodine
Example of amphoteric oxide is :
(a) Na2O
(b) K₂O
(c) Al2O3
(d) MgO
Option c – Al2O3
Which one among the following is an acidic oxide?
(a) Na2O
(b) CO
(c) CO2
(d) Al2O3
Option c – CO2
The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
Option c – Ne
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Option c – Calcination
Oxides of moderately reactive metals like Zine, Iron, Nickel, Tin, Copper etc. are reduced by using
(a) Aluminium as a reducing agent
(b) Sodium as a reducing agent
(c) Carbon as a reducing agent
(d) Calcium as a reducing agent
Option c – Carbon as a reducing agent
In thermite welding a mixture of….. and…… is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
(a) iron (III) oxide and aluminium powder
(b) iron (II) oxide and aluminium powder
(c) iron (III) chloride and aluminium powder
(d) iron (III) sulphate and aluminium powder
Option a – iron (III) oxide and aluminium powder
Which of the following are not ionic compounds? (i) KC1 (ii) HCI (iii) CCl4 (iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
Silver articles become black on prolonged exposure to air. This is due to the formation of
(a) Ag3N
(b) Ag₂O
(c) Ag₂S
(d) Ag₂S and Ag3N
Option c – Ag₂S
The reaction between X and Y forms compound Z. X loses electrons and Y gains electrons. Which of the following properties is not shown by Z?
(a) Has a high melting point
(b) Has a low melting point
(c) Conducts electricity in a molten state
(d) Occurs as solid
Option b – Has a low melting point
Brass is a mixture of
(a) copper and zinc
(b) copper and tin
(c) copper, nickel and zinc
(d) aluminium, copper and traces of Mg and Mn
Option a – copper and zinc
Which of the following non-metals has shining lustrous surfaces?
(a) Graphite and phosphorus
(b) Graphite and iodine
(c) Iodine and phosphorus
(d) Phosphorus and chlorine
Option b – Graphite and iodine
Consider the following elements : (i) Copper (ii) Gold (iii) Platinum (iv) Silver Which of the above elements exist free in nature?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iii) and (iv)
Option c – (i), (ii) and (iv)
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Option d – (i) and (iv)
What happens when calcium is treated with water? (i) It does not react with water (ii) It reacts violently with water (iii) It reacts less violently with water (iv) Bubbles of hydrogen gas formed stick to the surface of calcium
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)
Option d – (iii) and (iv)
Which property of metals is used for making bells and strings of musical instruments like the Sitar and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity
Option a – Sonorousness
Al₂O3 + 2NaOH -> …….. + H₂O
(a) Al(OH)3
(b) Na20
(c) NaAlO₂
(d) AINaO₂
Option c – NaAlO₂
Which of the following is the correct arrangement of the given metals in ascending order of their reactivity? Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Option d – Sodium > Magnesium > Zinc > Iron
Which of the following pairs will give displacement reactions?
(a) FeSO4 solution and Copper metal
(b) AgNO3 solution and Copper metal
(c) CuSO4 solution and Silver metal
(d) NaCl solution and Copper metal
Option b – AgNO3 solution and Copper metal
Non-metals form covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
Option b – they can share electrons with chlorine
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
(a) FeO
(b) Fe₂O3
(c) Fe3O4
(d) Fe₂O3 and Fe₂O4
Option c – Fe3O4
Which of tire following are not ionic compounds? (i) KCI (ii) HCI (iii) CCl4 (iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
Highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the
(a) electrolysis of their molten chloride
(b) electrolysis of their molten oxides
(c) reduction by aluminium
(d) reduction by carbon
Option a – electrolysis of their molten chloride
The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Option b – Aluminium
The poorest conductor of heat among metals is ( Class 8 Science Chapter 4 MCQ )
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Option a – Lead
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