Assertion (A) : Sodium metal is stored under kerosene.Reason (R) : Metallic sodium melts when exposed to air.Codes

Both A and R is true and R is the correct explanation of A

Both A and R is true but R is not a correct explanation of A

When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as

copper sulphide-copper carbonate

copper carbonate-copper sulphate

copper sulphate-copper sulphide

copper carbonate-copper hydroxide

copper sulphide-copper carbonate

What happens, when potassium fire in laboratory is extinguished by pouring water ?

fire is completely extinguished

heating the steel to a temperature much below redness and cooling it slowly

heating the steel bright red and then cooling slowly

heating the steel to a temperature much below redness and cooling it slowly

beating rods of iron embedded in charcoal powder

heating steel to bright red and cooling suddenly

279 + Mcqs in Metals and Their Compounds in Chemistry Page 2 McqOptions

51.	Which of the following acts as an antidote to HgCl₂ poisoning ?
A.	Yellow of egg
B.	egg of fish
C.	white of egg
D.	egg
Answer» D. egg

Discussion

52.	Mohr's salt on oxidation with conc HNO₃ is
A.	Neutral
B.	Basic
C.	Amphoteric
D.	Acidic
Answer» E.

Discussion

53.	The element which is not a liquid at room temperatre (30C) is
A.	Hg
B.	Ga
C.	Br
D.	Ge
Answer» E.

Discussion

54.	Consider the following statements : The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is 1. to keep the washing powder dry 2. to maintain the alkalinity of the powder Which of these statements is/are correct ?
A.	Only 1
B.	Only 2
C.	Both 1 and 2
D.	Neither 1 nor 2
Answer» D. Neither 1 nor 2

Discussion

55.

Match the List-I with List-II and select the correct answer using the codes given below the Lists
List-I List-II
F. Blue vitriol 1. Sodium bicarbonate
G. Epsom salt 2. Sodium hydroxide
H. Baking soda 3. Magnesium sulphate
J. Caustic soda 4. Copper sulphate
Codes :
F G H J
A. 3 4 2 1
B. 4 3 2 1
C. 3 4 1 2
D. 4 3 1 2

A.

B.

C.

D.

Answer» E.

Discussion

56.	Which of the following compounds of zine is white when cold and yellow when hot ?
A.	ZnS
B.	ZnCl
C.	ZnSO
D.	ZnO
Answer» E.

Discussion

57.	Assertion (A) : Sodium metal is stored under kerosene. Reason (R) : Metallic sodium melts when exposed to air. Codes
A.	Both A and R is true and R is the correct explanation of A
B.	Both A and R is true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» D. A is false but R is true

Discussion

58.	Iron loses magnetic property at
A.	Melting point
B.	Curie point
C.	1000
D.	K
E.	Boiling point
Answer» D. K

Discussion

59.	How many electrons are involved in the oxidation by KMnO₄ in basic medium ?
A.	5
B.	3
C.	2
D.	4
Answer» E.

Discussion

60.	Consider the following statements : Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to 1. act as the reducing agent 2. remove silica associated with the iron ore 3. function as fuel, to supply heat 4. act as an oxidizing agent Of these statements
A.	1 and 2 are correct
B.	2 and 4 correct
C.	1 and 3 are correct
D.	3 and 4 are correct
Answer» D. 3 and 4 are correct

Discussion

61.	The number of unpaired electrons in Fe⁺², Fe⁺³, Ni⁺² are respectively
A.	4,5,5
B.	4,5,2
C.	5,2,4
D.	5,4,2
Answer» C. 5,2,4

Discussion

62.	The metal constituent of
A.	Iron
B.	Potassium
C.	Manganese
D.	Magnesium
Answer» E.

Discussion

63.	A common metal used for the extraction of metals from their oxides by reduction is
A.	Fe
B.	Al
C.	Cr
D.	Co
Answer» C. Cr

Discussion

64.	The most reactive metal in the universe is
A.	Na
B.	K
C.	Al
D.	Zn
Answer» C. Al

Discussion

65.	The purpose of smelting an ore to
A.	reduce it
B.	oxide it
C.	obtain an alloy
D.	separate volatile impurities
Answer» B. oxide it

Discussion

66.	Which is based on the phenomenon of hydrolysis is called
A.	poling
B.	liquation
C.	hydrometallurgy
D.	electrorefining
Answer» E.

Discussion

67.	Which of the following elements are analogous to the lanthanides ?
A.	borides
B.	carbides
C.	hydrides
D.	actinides
Answer» E.

Discussion

68.	An aqueous solution of copper sulphate is acidica in nature because the salt undergoes
A.	dialysis
B.	electrolysis
C.	hydrolysis
D.	photolysis
Answer» D. photolysis

Discussion

69.	Silver metal is obtained by
A.	Parke's process
B.	Froth floatation process
C.	Carbon reduction process
D.	Magnetic separation
Answer» B. Froth floatation process

Discussion

70.	Which one of the following does not form amalgam ?
A.	Ag
B.	Cu
C.	Fe
D.	Zn
Answer» D. Zn

Discussion

71.	Which one of the following materials is very hard and very ductile ?
A.	carborundum
B.	tungsten
C.	cast iron
D.	nichrome
Answer» E.

Discussion

72.	Rocy impurities present in a mineral are called
A.	flux
B.	gengue
C.	matte
D.	slag
Answer» C. matte

Discussion

73.	Lithium can react with water but cannot fuse in it due to
A.	high boiling point
B.	high melting point
C.	low boiling point
D.	low melting point
Answer» C. low boiling point

Discussion

74.	Which of the following is an ore of sodium ?
A.	Chile saltpetre
B.	carnallite
C.	sylvine
D.	none of these
Answer» B. carnallite

Discussion

75.	The element which has highest density is
A.	Pd
B.	Pt
C.	W
D.	Os
Answer» E.

Discussion

76.	The man-made transition element is
A.	Zr
B.	Tc
C.	Sc
D.	Hf
Answer» C. Sc

Discussion

77.	Carbon decomposes potassium carbonate into
A.	C
B.	O
C.	KCN
D.	K
Answer» E.

Discussion

78.	Perchloric acid is prepared by the action of concentrate sulphuric acid on
A.	potassium perchlorate
B.	barium chlorated
C.	barium chloride
D.	sodium chloride
Answer» B. barium chlorated

Discussion

79.	Which metal is obtained by amalgamation process ?
A.	Ag
B.	Al
C.	Cu
D.	Hg
Answer» B. Al

Discussion

80.	What happens when Fe metal is rusted ?
A.	Iodised
B.	Oxidised
C.	Ionised
D.	None of these
Answer» C. Ionised

Discussion

81.	Heating of pyrites in air to remove sulphur is known as
A.	roasting
B.	calcination
C.	smelting
D.	fluxing
Answer» B. calcination

Discussion

82.	The active metals are extracted from their ores by the process of reduction with
A.	hydrogen
B.	carbon
C.	electric current
D.	aluminium
Answer» D. aluminium

Discussion

83.	Which of the following metal does not show variable valance ?
A.	Pb
B.	Ba
C.	Cu
D.	None of these
Answer» C. Cu

Discussion

84.	A naturally occuring substance from which a metal can be profitably extracted is called
A.	mineral
B.	gangue
C.	ore
D.	flux
Answer» D. flux

Discussion

85.	The forth floation process is used for the concentration of
A.	oxide ores
B.	sulphide ores
C.	halide ores
D.	silicate ores
Answer» C. halide ores

Discussion

86.	Which of the following metals corrodes in moist air
A.	Au
B.	Ag
C.	Ni
D.	Fe
Answer» E.

Discussion

87.	Iron is manufactured form the ore
A.	Cryolite
B.	Bauxite
C.	Haematite
D.	Chalcopyrite
Answer» D. Chalcopyrite

Discussion

88.	When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as
A.	copper carbonate-copper sulphate
B.	copper sulphate-copper sulphide
C.	copper carbonate-copper hydroxide
D.	copper sulphide-copper carbonate
Answer» D. copper sulphide-copper carbonate

Discussion

89.	Which method is used for the purification of Bauxite ore ?
A.	Magnetic separation
B.	Electrolysis
C.	Leaching
D.	Levigation
Answer» D. Levigation

Discussion

90.	Gravity separation process may be used for concentration of
A.	Calamine
B.	Chalcopyrite
C.	Haematite
D.	Bauxite
Answer» D. Bauxite

Discussion

91.	What happens, when potassium fire in laboratory is extinguished by pouring water ?
A.	decrease in fire intensity
B.	increase in fire intensity
C.	fire is completely extinguished
D.	none of the above
Answer» C. fire is completely extinguished

Discussion

92.	The magnetic separation is used for increasing concentration of the following
A.	horn silver
B.	calcite
C.	haematite
D.	magnesite
Answer» D. magnesite

Discussion

93.	The oil used in the floatation method for the purification of ores is
A.	coconut oil
B.	olive oil
C.	pine oil
D.	none
Answer» D. none

Discussion

94.	Ferrosilicon is used in steel industry as
A.	cutting tool
B.	alloying agent
C.	flux
D.	a reducing agent
Answer» C. flux

Discussion

95.	Annealing process is
A.	heating the steel bright red and then cooling slowly
B.	heating the steel to a temperature much below redness and cooling it slowly
C.	beating rods of iron embedded in charcoal powder
D.	heating steel to bright red and cooling suddenly
Answer» B. heating the steel to a temperature much below redness and cooling it slowly

Discussion

96.	The iron obtained from blast furnace is
A.	soft iron
B.	big iron
C.	steel
D.	wrought iron
Answer» C. steel

Discussion

97.	Which one of the following ores contains both calcium and magnesium ?
A.	lime stone
B.	dolomite
C.	Epson salt
D.	carnallite
Answer» C. Epson salt

Discussion

98.	Which of the following is ferrous alloy ?
A.	Invar
B.	Solder
C.	Managlium
D.	Type steel
Answer» B. Solder

Discussion

99.	Silver containing lead as an impurity is removed by
A.	Poling
B.	Cupellation
C.	Lavigation
D.	Distillation
Answer» E.

Discussion

100.	Magnesium does not decompose in
A.	hot water
B.	steam
C.	semi hot water
D.	cold water
Answer» E.

Discussion

Explore topic-wise MCQs in Chemistry.

Which of the following acts as an antidote to HgCl2 poisoning ?

Mohr's salt on oxidation with conc HNO3 is

The element which is not a liquid at room temperatre (30 C) is

Consider the following statements :The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is1. to keep the washing powder dry2. to maintain the alkalinity of the powderWhich of these statements is/are correct ?

Match the List-I with List-II and select the correct answer using the codes given below the ListsList-IList-IIF. Blue vitriol1.Sodium bicarbonateG. Epsom salt2.Sodium hydroxideH. Baking soda3.Magnesium sulphateJ. Caustic soda4.Copper sulphateCodes :FGHJA.3421B.4321C.3412D.4312

Which of the following compounds of zine is white when cold and yellow when hot ?

Assertion (A) : Sodium metal is stored under kerosene.Reason (R) : Metallic sodium melts when exposed to air.Codes

Iron loses magnetic property at

How many electrons are involved in the oxidation by KMnO4 in basic medium ?

The number of unpaired electrons in Fe+2, Fe+3, Ni+2 are respectively

The metal constituent of

A common metal used for the extraction of metals from their oxides by reduction is

The most reactive metal in the universe is

The purpose of smelting an ore to

Which is based on the phenomenon of hydrolysis is called

Which of the following elements are analogous to the lanthanides ?

An aqueous solution of copper sulphate is acidica in nature because the salt undergoes

Silver metal is obtained by

Which one of the following does not form amalgam ?

Which one of the following materials is very hard and very ductile ?

Rocy impurities present in a mineral are called

Lithium can react with water but cannot fuse in it due to

Which of the following is an ore of sodium ?

The element which has highest density is

The man-made transition element is

Carbon decomposes potassium carbonate into

Perchloric acid is prepared by the action of concentrate sulphuric acid on

Which metal is obtained by amalgamation process ?

What happens when Fe metal is rusted ?

Heating of pyrites in air to remove sulphur is known as

The active metals are extracted from their ores by the process of reduction with

Which of the following metal does not show variable valance ?

A naturally occuring substance from which a metal can be profitably extracted is called

The forth floation process is used for the concentration of

Which of the following metals corrodes in moist air

Iron is manufactured form the ore

When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as

Which method is used for the purification of Bauxite ore ?

Gravity separation process may be used for concentration of

What happens, when potassium fire in laboratory is extinguished by pouring water ?

The magnetic separation is used for increasing concentration of the following

The oil used in the floatation method for the purification of ores is

Ferrosilicon is used in steel industry as

Annealing process is

The iron obtained from blast furnace is

Which one of the following ores contains both calcium and magnesium ?

Which of the following is ferrous alloy ?

Silver containing lead as an impurity is removed by

Magnesium does not decompose in

Which of the following acts as an antidote to HgCl₂ poisoning ?

Mohr's salt on oxidation with conc HNO₃ is

The element which is not a liquid at room temperatre (30C) is

Consider the following statements :
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is
1. to keep the washing powder dry
2. to maintain the alkalinity of the powder
Which of these statements is/are correct ?

Assertion (A) : Sodium metal is stored under kerosene.
Reason (R) : Metallic sodium melts when exposed to air.
Codes

How many electrons are involved in the oxidation by KMnO₄ in basic medium ?

The number of unpaired electrons in Fe⁺², Fe⁺³, Ni⁺² are respectively