## general science

### Chemistry MCQ Questions and Answers page - 2

1.
 In a reaction, what is the loss of hydrogen by substance called as ? A Reduction B Oxidation C Hydronization D Both reduction and hydronization Answer : B Explanation :
2.
 Which of the following is an example of colloidal solution of liquid in solid ? A Mud B Milk C Cheese D Rubber Answer : C Explanation :
3.
 Which of the following is a heterogeneous mixture ? A Solution B Suspension C Both solution and suspension D Neither solution nor suspension Answer : B Explanation :
4.
 When a substance loses oxygen during a reaction, it is called  _________ . A Corrosion B Reduction C Oxidation D Both corrosion and oxidation Answer : B Explanation :
5.
 Which element is most electronegative among Arsenic, Nitrogen and Phosphorus ? A Nitrogen B Phosphorus C Arsenic D All these elements have equal electronegativity Answer : A Explanation :
6.
 Which of the following can be defined as the smallest particle of an element that is capable of an independent existence ? A Electron B Proton C Neutron D Molecule Answer : D Explanation :
7.
 In which of the following states maximum iron ore is found ? A FeCO3 B Fe2O3 C Fe3O4 D FeS2 Answer : B Explanation :
8.
 Where does the oxygen that keeps us alive come from ? A Carbon dioxide B Carbonates absorbed from soil C Oxides of minerals D Water Answer : D Explanation :
9.
 The three element most needed in common fertilisers are : A Sulphur, phosphorous and sodium B Nitrogen, Potassium and phosphorous C Phosphorous, sodium and nitrogen D Calcium, phosphorous and Potassium Answer : B Explanation :
10.
 Which of the following metals pollutes the air of a city having large number of automobiles ? A Cadmium B Chromium C Lead D Copper Answer : C Explanation :
11.
 The substance which does not expand on going from liquid state to solid state is A Water B Cast-iron C Aluminium D Type metal Answer : D Explanation :
12.
 Which of the following is used as a lubricant in heavy machines ? A Bauxite B Sulphur C Phosphorus D Graphite Answer : D Explanation :
13.
 The anode in a dry cell consists of A Copper B Zinc C Cadmium D Graphite Answer : B Explanation :
14.
 Galvanization is the : A Deposition of zinc on iron B Deposition of tin on iron C Deposition of copper on iron D Deposition of aluminium on iron Answer : A Explanation :
15.
 What is the most commonly used substance in fluorescent tubes ? A Sodium oxide and argon B Sodium vapour and neon C Mercury vapour and argon D Mercury oxide and neon Answer : C Explanation :
16.
 Bronze is an alloy of A Copper and Zinc B Tin and Zinc C Copper and Tin D Iron and Zinc Answer : C Explanation :
17.
 Which one of the following metals is used to galvanise iron ? A Copper B Lead C Zinc D Mercury Answer : C Explanation :
18.
 Which of the following is not a precious/semi-precious stone ? A Sapphire B Ruby C Pearl D Emerald Answer : C Explanation :
19.
 Which among the following metals provides amphoteric oxide ? A Sodium B Silver C Aluminium D Calcium Answer : C Explanation :
20.
 Humburger effect is otherwise known as A Sodium pump B Anaerobic metabolism C Choloride shift D Respiratory product Answer : C Explanation :
21.
 Which among the following elements is found in maximum percentage in the human body ? A Carbon B Hydrogen C Nitrogen D Oxygen Answer : D Explanation :
22.
 Which among the following is pure matter ? A Carbon-dioxide B Brass C Air D Iron Answer : A Explanation :
23.
 Which among the following coal contains 90 per cent of carbon ? A Anthracite B Bitumen C Lignite D Peat Answer : A Explanation :
24.
 Quartz is made of A Calcium Sulphate B Calcium Silicate C Sodium Sulphate D Sodium Silicate Answer : D Explanation :
25.
 Which of the following is ozone depleting pesticide ? A D.D.T. B Benzene C Methyl bromide D Ethylene ozonide Answer : C Explanation :
26.
 Global warming is mainly due to accumulation of A Oxides of nitrogen B Oxides of  sulphur C Carbon dioxide D Carbon monoxide Answer : C Explanation :
27.
 The most suitable vessel for storing concentrated sulphuric acid is A Copper vessel B Aluminium vessel C Glass vessel D Earthen vessel Answer : C Explanation :
28.
 Formation of ozone hole is maximum over A Africa B India C Antarctica D Europe Answer : C Explanation :
29.
 Which of the following gases will effuse out of football bladder most quickly ? A He B $H_{2}$ C $N_{2}$ D $O_{2}$ Answer : B Explanation :
30.
 Which of the following alkali metals has highest specific heat ? A Caesium B Rubidium C Potassium D Lithium Answer : D Explanation :
31.
 In which of the following substances all carbon atoms are quaternary in nature ? A Graphite B Diamond C Teflon D Naphthalene Answer : B Explanation :
32.
 The ratio of pure gold in 18 carat gold is : A 60% B 75% C 80% D 90% Answer : B Explanation :
33.
 Dimond is harder than graphite because of : A Difference in layers of atoms B Tetrahedral structure of diamond C Difference of crystalline structures D None of these Answer : A Explanation :
34.
 What is the element required for solar energy conversion ? A Beryllium B Tantalum C Silicon D Ultra pure carbon Answer : C Explanation :
35.
 Which of the following type of coal has the lowest proportion of volatile matter ? A Lignite B Peat C Bituminous D Anthracite Answer : D Explanation :
36.
 Which of the following is used as filler in tyre of rubber ? A Carbon black B Coal C Coke D Graphite Answer : A Explanation :
37.
 Which of the following alloy is used in making magnet ? A Duralumin B Stainless steel C Alnico D Magnalium Answer : C Explanation :
38.
 Cloud is a colloidal dispersion of A Air in a dispersion medium of water B Fog in a dispersion medium of water C Mist in a dispersion medium of air D Water drops in a dispersion medium of air Answer : D Explanation :
39.
 Which of the purest form of iron ? A Steel B Cast iron C Pig iron D Wrought iron Answer : D Explanation :
40.
 Which of the following merals from an amalgam with other metals ? A Lead B Tin C Zinc D Mercury Answer : D Explanation :
41.
 Which of the following is used in making smoke bombs ? A Sulphur B Phosphorus C Hydrogen D Carbon Answer : D Explanation :
42.
 German silver is an alloy of A Copper, nickel and silver B Silver, Copper and aluminium C Zinc, Copper and nickel D Zinc, silver and Copper Answer : C Explanation :
43.
 A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be A Silver B Copper C Aluminium D Zinc Answer : B Explanation :
44.
 Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers, etc. ? A Iron and cadmium B Nickel and cadmium C Lead peroxide and lead D Zinc and carbon Answer : D Explanation :
45.
 Metal are good conductors, because A They contain free electrons B The molecules in them are very close to each other C The molecules in them collide very freely D They contain reflecting surface Answer : A Explanation :
46.
 The first metal used by a man was A Copper B Silver C Bronze D Brass Answer : A Explanation :
47.
 Drinking soda is A Alkaline B Acidic C Neutral D Oxidant Answer : B Explanation :
48.
49.
 Among the following iron ores, the highest percentage of iron content is found to A Haematite B Magnetite C Limnonite D None of these Answer : A Explanation :
50.
 Pasteurisation of milk means – A Heating of milk to above 720C B Heating of milk to above 620C C Cooling of milk to about 620C D Cooling of milk to about 100C Answer : B Explanation :
51.
 Aluminium can be purified by A Oxidation B Distillation C Electrolysis D Ozonolysis Answer : C Explanation :
52.
 Impure camphor is purified by A Sublimation B Fractional crystallisation C Fractional distillation D Steam distillation Answer : A Explanation :
53.
 Greenhouse effect is caused by A Nitrogen B Carbon dioxide C Carbon monoxide D Nitrogen dioxide Answer : B Explanation :
54.
 Type metal used in printing press is an alloy of A Lead and copper B Lead and antimony C Lead and bismuth D Lead and zinc Answer : B Explanation :
55.
 Diamonds are glittering and attractive because light incident on them undergoes A Highest refraction B Multiple internal refraction C Multiple surface refraction D Hundred percent transmission Answer : B Explanation :
56.
 Water can be separated from alcohol water mixture by A Decantation B Evaporation C Distillation D Sublimation Answer : C Explanation :
57.
 The gas used for filling weather balloons is A Helium B Hydrogen C Air D Nitrogen Answer : A Explanation :
58.
 Hydrogen is not found in atmosphere because A It is highly inflammable B It is the lightest gas C It is absorbed by plants D It immediately combines with oxygen to form water Answer : B Explanation :
59.
 What material is used to make electric heater coil ? A Copper B Iron C Silver D Nichrome Answer : D Explanation :
60.
 The major constituent of air is A Nitrogen B Carbon dioxide C Oxygen D Hydrogen Answer : A Explanation :
61.
 Rusting of iron takes place due to A Oxidation B Carbonation C Exfoliation D Corrosion Answer : A Explanation :
62.
 The purity of gold is expressed in carats. The purest form of gold is A 24 carats B 99.6 carats C 91.6 carats D 22 carats Answer : A Explanation :
63.
 The lustre of the metals is be cause of A High density, due to closed packing of atoms B High polish C Reflection of light due to the presence of free electrons D Absorption of light due to the presence of cavities Answer : C Explanation :
64.
 One of the following is used to dissolve noble metals. That is A Nitric acid B Hydrochloric acid C Sulphuric acid D Aqua ragia Answer : D Explanation :
65.
 Percentage of carbon in steel ranges from A 0.1 to 1.5 B 1.5 to 3.0 C 3.0 to 4.0 D 4.0 to 6.0 Answer : A Explanation :
66.
 The most abundant inter gas in the atmosphere is A Helium B Neon C Argon D Krypton Answer : C Explanation :
67.
 Which metal is extracted from sea water ? A Potassium B Magnesium C Aluminium D Beryllium Answer : B Explanation :
68.
 Percentage of lead in lead pencils is A 31 – 66 B 40 C 80 D Answer : A Explanation :
69.
 The gas which turns into liquid at the lowest temperature among the following is A Hydrogen B Oxygen C Helium D Nitrogen Answer : A Explanation :
70.
 Gunpowder consists of a mixture of A Sand and TNT B TNT and charcoal C Nitre, sulphur and charcoal D Sulphur, sand and charcoal Answer : C Explanation :
71.
 Which gas does not form the part of atmosphere ? A Nitrogen B Helium C Chlorine D None of the above Answer : C Explanation :
72.
 White coal is A Uranium B Hydro-electricity C Diamond D Ice Answer : A Explanation :
73.
 What is the maximum Water Vapour content in the atmosphere ? A 2 to 3 per cent B 3 to 4 per cent C 4 to 5 per cent D 5 to 6 per cent Answer : B Explanation :
74.
 The amount of chlorine available in water after disinfection is called as A Free chlorine B Residual chlorine C Free available chlorine D Combined available chlorine Answer : B Explanation :
75.
 Photooxidation process is initiated by A Light B Heat C Oxygen D Catalyst Answer : A Explanation :
76.
 Ultraviolet radiation striking the earth is due to the depletion of A Carbon monoxide B Carbon dioxide C Ozone D Oxygen Answer : C Explanation :
77.
 Major gaseous pollutant of the thermal power station is A $H_{2}&space;S$ B $NH_{3}$ C $NO_{2}$ D $SO_{2}$ Answer : D Explanation :
78.
 The tip of the match-stick contains A Phosphorus pentoxide B White phosphorus C Red phosphorus D Phosphorus trichloride Answer : C Explanation :
79.
 Which of the following substance is highly plastic ? A Quartz B Mica C Granite D Clay Answer : D Explanation :
80.
 Carbon monoxide is an inflammable gas. Which one of the followings is also inflammable ? A Helium B Nitrogen C Oxygen D Hydrogen Answer : D Explanation :