Q.1
The metallic constituents of hard water are :
Q.2
Potassium Permanganate is used for purifying drinking water, because________
Q.3
Ultraviolet rays can be used in water treatment as
Q.4
Which mineral is the ore of aluminium ?
Q.5
Which of the following is a metallic ore ?
Q.6
Bee sting contains
Q.7
Sweat contains water and ________
Q.8
If water smells bad, then that odour can be removed by adding
Q.9
Maximum permissible concentration of total hardness in drinking water is
Q.10
The purest form of Iron is :
Q.11
Sea water is saltier than rain water because
Q.12
Which of the following is the strongest base in aqueous solution ?
Q.13
Lead in water can cause
Q.14
Tar roads get damaged if there is
Q.15
Magnalium is an alloy of
Q.16
Surface water is a better source of drinking water because it is poor in
Q.17
Which one of the following is extensively used for sterilizing water ?
Q.18
Which one of the following contains maximum percentage of carbon ?
Q.19
Stainless steel is an alloy of
Q.20
Which one of the following is not a characteristic feature of alloys?
Q.21
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
Q.22
Froth floatation process to concentrate the minerals is applicable to
Q.23
Brass is made of
Q.24
Bauxite is used as raw material by which industry ?
Q.25
An alloy used in making heating elements for electric heating device is
Q.26
Which of the following is an iron ore ?
Q.27
Which of the following acids serves as an electrolyte in a lead storage battery?
Q.28
Hardness of the water is commonly measured in terms of
Q.29
Aerated water contains
Q.30
Magnetite is
Q.31
Assertion (A) : Synthetic detergents can lather when in hard water.
Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.
Q.32
Iron is extracted from
Q.33
Galena is a mineral of
Q.34
Aluminium can be purified by
Q.35
Chemical name of Gammaxane is
Q.36
Bridgmanite is
Q.37
Bronze is an alloy of
Q.38
Brass contains
Q.39
The important metal used with iron to produce stainless steel is
Q.40
Which is known as carbolic acid?
Q.41
Citric acid is present in free form in
Q.42
Most commonly used bleaching agent is
Q.43
The BOD values of water indicate the
Q.44
Which is the purest form of iron?
Q.45
The iron ore which contains 72% of iron is :
Q.46
The aqueous solution of potassium chloride is
Q.47
Which one is the simplest form of alkane?
Q.48
Which of the following is used in making smoke bombs?
Q.49
Epsom salt is used
Q.50
The metal extracted from Bauxite is :
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