CBSE Class 10 Science Metals and Non Metals MCQs Set A

Question : Which is the least conductor of heat

a) Lead

b) Gold

c) Platinum

d) Silver

Answer : Lead

Question : Metal have ______no. of electrons in their outer most shell

a) 1 to 3

b) 1 to 8

c) 7 to 9

d) 10 to 12

Answer : 1 to 3

Question : Which oxide is neutral ?

a) H₂O

b) NO₂

c) MgO

d) None of these

Answer :  H₂O

Question :  Al2.O₃ 2SiO₂.2H₂O is the chemical formula of

a) China Clay

b) Bauxite

c) Haemetite

d) Monazite

Answer : China Clay

Question : An alloy is

a) A mixture

b) A metalloid

c) A element

d) An isomer

Answer : A mixture

Question : Which non-metal is the best conductor of electricity

a) Graphite

b) Phosphorus

c) Phosphorus

d) Bromine

Answer : Graphite

Question : Which compound is used in photography

a) AgBr

b) AgO

c) AgCl

d) AgNO₃

Answer : AgBr

Question : Carnallite is the mineral of

a) Mg

b) Na

c) Ca

d) All of these

Answer : Mg

Question : The magnesium is used in

a) All of these

b) Grignard reagent

c) Flash bulb

d) Electron alloy

Answer : All of these

Question : Cinnabar is an ore of

a) Mercury

b) Calcium

c) Copper

d) Lead

Answer : Mercury

Question : The constituent of haemoglobin is

a) Iron

b) Copper

c) Sodium

d) Magnesium

Answer : Iron

Question : The most abundant metal in the earth crust is

a) Al

b) O

c) Fe

d) Cu

Answer : Al

Question : Because of high electropositively, the atom of metals can easily form

a) Positive ions

b) Negatively ions

c) Neutral ions

d) Covalent bonds

Answer : Positive ions

Question : Volatile metals are purified by

a) Distillation

b) Oxidation

c) Liquation

d) Electrolytic refining

Answer : Distillation

Question : Amalgam is the homogeneous mixture of

a) Metal and mercury

b) Metal and non-metal

c) Metal and metal

d) All of these

Answer : Metal and mercury

Question : Which of the following is a ferrous alloy

a) Steel

b) Brass

c) Solder

d) Magnalium

Answer : Steel

Question : Which of the following statements is correct

a) All minerals are ores

b) All ores are minerals

c) All ores are minerals

d) None is correct

Answer : All minerals are ores

Question : Food cans are coated with tin and not zinc because

a) Zinc is more reactive than tin

b) Zinc is less reactive than tin

c) Zinc has a higher melting point than tin

d) Zinc is costlier than tin

Answer : Zinc is more reactive than tin

Question : Elements with atomic number greater than 92 are also called

a) transuranic elements

b) noble gas elements

c) alkaline earth metals

d) alkali metals

Answer : transuranic elements

Question : A purple-coloured solid halogen is

a) I

b) CI

c) Br

d) F

Answer : I

Question : Chajcogen refers to

a) ore-forming elements

b) chemically inert elements

c) salt-forming elements

d) alkali-forming elements

Answer : ore-forming elements

Question : Which of the following is a solid at STP?

a) iodine

b) chlorine

c) fluorine

d) bromine

Answer : iodine

Question :  Element M is a metal and its chloride has the formula MCl₂. The element most likely belongs to which group of the periodIC table'?[

a) 2

b) 17

c) 1

d) 15

Answer : 2

Question : Copper is extracted from low grade ore by

a) hydrometallurgy

b) pyrometallurgy

c) electrometallurgy

d) all of the above processes

Answer : hydrometallurgy

Question : Roasting process is applied to which of them following ores?

a) all of these

b) iron pyrites

c) galena

d) copper glance

Answer : all of these

Question : Purification of metals by liquation method is based on difference in

a) melting point

b) vapour density

c) density

d) solubility

Answer : melting point

Question : Arrange the following metal in the increasing order of their reactivity towards water: Zinc, Iron, Magnesium, Sodium

a) iron < zinc < magnesium < sodium

b) magnesium < iron < sodium < zinc

c) sodium < iron < magnesium < zinc

d) iron < Magnesium < sodium < zinc

Answer : iron < zinc < magnesium < sodium

Question : Which of the following is used for making magnets

a) alnico

b) magnalium

c) duralumin

d) bronze

Answer : alnico

Question : White phsphorus is stored in

a) water

b) ether

c) alcohol

d) kerosene oil

Answer : water

Question : Ordinary glass is a mixture of

a) sodium silicate, calcium silicate

b) sodium silicate, calcium silicate and silica

c) sodium silicate and silica

d) none of the above

Answer : sodium silicate, calcium silicate

Question : Annealing is done to

a) decrease brittleness

b) increase refractive inded

c) increase Transparancy

d) increase brittleness

Answer : decrease brittleness

Question : Polymer used in making floor tiles is

a) polyyinyl chloride

b) teflon

c) polypropylene

d) buta-1, 3-diene

Answer : polyyinyl chloride

Question : Which of the following is an example of condensaiton polymers?

a) nylon

b) neoprene

c) polyethene

d) teflon

Answer : nylon

Question : Insulation of electric wire is done by

a) vinyl chloride

b) isoprene

c) neoprene

d) buta-1, 3-diene

Answer : vinyl chloride

Question : Permanent magnets can be made from

a) Wrought iron

b) Cobalt steel

c) Ni steel

d) Stainless steel

Answer : Wrought iron

Question : The formula of Oleum is

a) H₂S₂O₇

b) H₂S₂O₆

c) H₂SO₄

d) None of these

Answer :  H₂S₂O₇

Question : The main constituents of cement are

a) calcium oxide, silicon dioxide, Aluminium oxide

b) calcium oxide, Iron oxide, Sulphur dioxide

c) magnesium oxide, Silicon dioxide, Aluminium oxide

d) none of these

Answer : calcium oxide, silicon dioxide, Aluminium oxide

Question : Hard glass is prepared by

a) fusing a mixture of potassium carbonate, calcium carbonate and silica

b) fusing a mixture of potassium carbonate and any oxide

c) none of the above

d) fusing a mixutre of sodium carbonate, calcium carbonate and silica

Answer : fusing a mixture of potassium carbonate, calcium carbonate and silica

Question : The soap can be hardened by

a) adding sodium carbonate or sodium silicate during its manufacture

b) adding sodium chloride

c) adding potassium hydroxide

d) adding animal fat and coconut oil

Answer : adding sodium carbonate or sodium silicate during its manufacture

Question : Soda Acid for extinguisher contains

a) sodium hydrogen carboante and sulphuric acid

b) sodium carbonate and nitric acid

c) sodium carboante and carbonic acid

d) sodium chloride and sulphuric acid

Answer : sodium hydrogen carboante and sulphuric acid

Question : The real bleaching agent present in bleaching powder is

a) chlorine

b) oxygen

c) CaO

d) none of the above

Answer : chlorine