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Chemistry

16)Cooking oil can be converted into vegetable ghee by the process of
crystallization distillization
oxidation hydrogenation
Answer :

17)Iron articles rust because of the formation of
ferrus chloride ferric chloride
sodium carbonate a mixture of ferrus and ferric hydroxides
Answer :

18)Diamond is chemically
a mixture of metal carbonates a pure form of sand
pure carbon a mixture of calcium and magnesium phosphates
Answer :

19)Nitrogen in air
dilutes oxygen which, otherwise is very active in the pure form is essential for our body
makes oxygen soluble in blood decrease the density of air
Answer :

20)Two solution are said to be isotonic when they
contains the same solute dissolved in them have the same osmotic pressure
are of same concentration have the same vapour pressure
Answer :

21)Cooking gas supplied in cylinders by gas agencies is
gaseous liquid
solid a solution
Answer :

22)Cooking gas is a mixture of
carbon monoxide and carbon dioxide methane and ethylene
carbon dioxide and oxygen butane and propane
Answer :


23)Mica is a
good conductor of both heat and electricity bad conductor of heat and good conductor of electricity
bad conductor of both heat and electricity good conductor of heat and bad conductor of electricity
Answer :

24)The gas inside an electric bulb is
air oxygen
notrogen carbon dioxide
Answer :

25)The weight of a rusted iron object is _________ that of an unrusted one
appreciably more than the same
less than more or less the same as
Answer :

26)The absolute zero of temperature is
the lowest temperature that is theoritically possible the starting point of any scale of temperature
the temperature at which the vapour of all substances freeze the temperature at which all substances exist in the vapour phase
Answer :

27)During the burning of fuels, carbon and hydrogen present in the fuels are
absorbed by the surroundings converted in alkanes
converted into carbon dioxide and water vapour released into the atmosphere
Answer :

28)The most abundant gas in the atmosphere is
helium nitrogen
carbon dioxide oxygen
Answer :

29)In order to prevent the corrosion of iron pipes they are often coated with a layer zinc. This process is called
electroplating annealing
vulcanization galvanization
Answer :

30)The main chemical substance present in the bone and teeth of animal is
calcium phosphate calcium sulphate
sodium chloride sodium carbonate
Answer :

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