Chemistry most Imp mcq
1.Which of the following is a halogen?
Astatine.
2.The compound used in photography is
Sodium thiosulphate.
3.Brine is a solution of
Sodium chloride in water.
4.Lunar caustic is
Silver nitrate.
5.The formula for cane sugar is
C12H22O11.
6.Temporary hardness is due to the presence of
Calcium bicarbonate.
7.The compounds produced by plants in the process of photosynthesis are
Carbohydrates.
8.The metal which reacts most violently with cold water is
Potassium.
9.‘Boiler scales’ contain
Calcium carbonate.
10.Marble is
Calcium carbonate.
11.The form of carbon used in decolorizing sugar solution is
animal charcoal.
12.Artificial diamonds were produced by
Moissan.
13.Marsh gas is
Methane.
14.The oldest known organic compound is
acetic acid.
15.Methylated spirit is a mixture of
methyl alcohol and ethyl alcohol.
16.The simplest hydrocarbon is
Methane.
17.During fermentation, the by- product is
carbon dioxide.
18.Carbogen is used in
Co poisoning.
19.Soda-water contains
carbonic acid.
20.The purest form of carbon is
sugar charcoal.
21.The poisonous nature of carbon monoxide is due to
its combination with hemoglobin of blood.
22.A compound of carbon used as anesthetic is
Chloroform.
23.Which of the following carbon compounds is used as a
carbon tetrachloride.
24.Rayon is made from
Cellulose.
25.Which of the following is a very good supporter of combustion?
Oxygen.
26.Which of the following can absorb gases quickly?
Activated charcoal.
27.Hydrogen bomb is based on the principle of ____________?
Nuclear fusion.
28.The father of modern chemistry is __________?
Lavoisier
29.Which one of the following substances does not have a melting point____________?
Glass.
30.Which one of the following elements is the poorest conductor of heat?
Lead.
31.Which one among the following agents is added to domestic LPG cylinder to help in the detection of gas leakage?
Thioethanol.
32.The photoelectric effect is described as the ejection of electrons from the surface of a metal when _______________?
Light of suitable wavelength falls on it.
33.Atomic number is equal to
Number of protons.
34.Which of the following is produced during the formation of photochemical
smog?
Ozone.
35.The oxide of Nitrogen used in medicine as anaesthetic is?
Nitrogen pent-oxide.
