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Free download in PDF CBSE Class 11 Chemistry Objective Type Questions & Answers. Here Gkseries provide Chemistry Solve Questions and Answers for CBSE Class 11 Students.
(21)
When quick lime is added to water
[A]
Heat is liberated
[B]
Temperature decreases
[C]
Heat is absorbed
[D]
No heat change takes place
Answer: Heat is liberated
(22)
The iron layered with zinc is called
[A]
Galvanised iron
[B]
Steel
[C]
Pig iron
[D]
Cost iron
(23)
Which one of the following is the softest?
[A]
Lithium
[B]
Aluminium
[C]
Iron
[D]
Calcium
(24)
What is a mixture of potassium nitrate , powdered charcoal and sulphur called?
[A]
Gun Powder
[B]
Paint
[C]
Glass
[D]
Cement
(25)
Which substance is used to retard the setting action of cement?
[A]
CaSO.2HO
[B]
NaO + KO
[C]
AlO
[D]
CaO
(26)
For Which one of the following is the density maximum ?
[A]
Water
[B]
Ice
[C]
Chloroform
[D]
Benzene
(27)
Which one of the following glasses is used in bullet proof screens?
[A]
Reinforced glass
[B]
Jena glass
[C]
Pyrex glasss
[D]
Soda glass
(28)
Which one of the following is used as a mordant in dyeing and tanning indusrty?
[A]
magnesium sulphate
[B]
magnesium chloride
[C]
Magnesium oxide
[D]
magnesium carbonate
Answer: magnesium sulphate
(29)
Which one of the following substances is made up of only one type of atoms?
[A]
hydrogen
[B]
air
[C]
water
[D]
milk
(30)
Talc contains which one of the following ?
[A]
magnesium,silicon,oxygen
[B]
zinc,tin,sulphur
[C]
calcium,oxygen,tin
[D]
zinc,calcium,oxygen
Answer: magnesium,silicon,oxygen
31
Acid rain contains high levels of
[A]
sulphuric and nitric acids
[B]
carbolic acid
[C]
acetic acid
[D]
oxalic acid
32
What are Rubies and Sapphires chemically known as
[A]
aluminium oxide
[B]
boron nitride
[C]
silicon dioxide
[D]
lead tetra oxide
33
Curd is sour due to presence of
[A]
Lactic acid
[B]
Oxalic acid
[C]
Acidic acid
[D]
Tartaric acid
34
Which of the following is a super cooled liquid?
[A]
Glass
[B]
Ice cream
[C]
Teflon
[D]
Mercury
35
Bronze is an alloy of
[A]
Copper and tin
[B]
Copper and zinc
[C]
Tin and zinc
[D]
Iron and zinc
36
Which one of the following elements is not present in stainless steel?
[A]
Tungsten
[B]
Nickel
[C]
Iron
[D]
Chromium
37
Which alloy contains nickel?
[A]
Solder
[B]
Invar
[C]
Brass
[D]
Bronze
38
Which one of the following polymeric matreials is used for making bullet proof jacket?
[A]
KEVLAR
[B]
DACRON
[C]
NYLON 6.6
[D]
None
39
Which one of the following is used as a filter in rubber tyres?
[A]
Coke
[B]
Carbon black
[C]
Graphite
[D]
Coal
40
Glass is made of the mixture of
[A]
Sand and silicates
[B]
Sand and salt
[C]
Quartz and mica
[D]
None of these
Answer: Sand and silicates
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