## general science

### Chemistry MCQ Questions and Answers page - 4

1.
 Asbestos is formed of : A Calcium and Magnesium B Copper, Zinc and Manganese C Lead and Iron D Calcium and Zinc Answer : A Explanation :
2.
 Which one of the following is known as the ‘brown coal’ ? A Anthracite B Bituminous C Coke D Lignite Answer : D Explanation :
3.
 One carat of diamond is equal to A 100 mg B 150 mg C 200 mg D 250 mg Answer : C Explanation :
4.
 Nitrogen forms a variety of compounds in all oxidation states ranging from A -3 to +5 B -3 to +3 C -3 to +4 D -3 to +6 Answer : A Explanation :
5.
 Charcoal is used in water treatment as a/an A Absorbent B Coagulant C Solvent D Adsorbent Answer : D Explanation :
6.
 An element that does not occur in nature but can be produced artificially is A Thorium B Radium C Plutonium D Uranium Answer : C Explanation :
7.
 The manufacture of iron from iron ore involves the process of A Oxidation B Reduction C Fractional distillation D Electrolysis Answer : B Explanation :
8.
 Which one of the following is caused by the higher concentration of Nitrogen and Phosphorous ? A Eutrophication B Hardness C Alkalinity D Acidity Answer : A Explanation :
9.
 The main source of carbon monoxide is A Industrial process B Fuel combustion C Transportation D Solid waste disposal Answer : C Explanation :
10.
 Electric fuse is an alloy of A Tin and lead B Zinc and lead C Copper and iron D Carbon and tin Answer : A Explanation :
11.
 Which among the following is liquid non-metal ? A Mercury B Bromine C Water D Alcohol Answer : B Explanation :
12.
 In silver paints, the main constituent present is A Aluminium powder B Silver powder C Lead powder D White powder Answer : A Explanation :
13.
 Which one of the following is colour – less ? A Chlorine B Oxygen C Phosphorus D Sulphur Answer : B Explanation :
14.
 Which one out of the following helps in burning ? A Oxygen B Carbon monoxide C Nitrogen D Carbon dioxide Answer : A Explanation :
15.
 Silicon is a A Semiconductor B Insulator C Non-conductor D Conductor Answer : A Explanation :
16.
 The percentage of oxygen in air is approximately A 100% B 1% C 78% D 21% Answer : D Explanation :
17.
 Element 106 was discovered by A Rutherford B Seaborg C Lawrence D Kurchatove Answer : B Explanation :
18.
 Which one of the following metals is used in Space Crafts to withstand high temperatures ? A Fe B Ti C Ni D Pb Answer : B Explanation :
19.
 Brass gets discoloured in air due to constant exposure in presence of : A Aluminium phosphide B Hydrogen sulphide C Hydrogenated wafers D Aluminium sulphide Answer : B Explanation :
20.
 Nitrogen is an essential constituent of all : A Fats B Proteins C Vitamins D Carbohydrates Answer : B Explanation :
21.
 The percentage of nitrogen present in ammonium sulphate is : A 21% B 25% C 30.5% D 18% Answer : A Explanation :
22.
 Which metal is the heaviest in periodic table among the following ? A Os B Pt C Pb D W Answer : A Explanation :
23.
 The important metal used with iron to produce stainless steel is A Aluminium B Chromium C Tin D Carbon Answer : B Explanation :
24.
 The name of unreactive gas is A Carbon dioxide B Hydrogen C Nitrogen D Oxygen Answer : C Explanation :
25.
 Which one of the following metals can deposit copper from copper sulphate solution ? A Platinum B Mercury C Iron D Gold Answer : C Explanation :
26.
 When Arsenic atoms are added to Germanium lattice, it becomes a/an A Insulator B Superconductor C Intrinsic semiconductor D Extrinsic semiconductor Answer : D Explanation :
27.
 Which among the following is used to dilute oxygen the gas cylinders used by divers ? A Krypton B Argon C Helium D Neon Answer : C Explanation :
28.
 The non – metal found in the liquid state is A Bromine B Nitrogen C Fluorine D Chlorine Answer : A Explanation :
29.
 The gas used to extinguish fire is A Neon B Nitrogen C Carbon dioxide D Carbon monoxide Answer : D Explanation :
30.
 The gas causing acid rain in an industrial area is A Carbon dioxide B Carbon monoxide C Sulphur dioxide D Methane Answer : C Explanation :
31.
 The highest volume of gases in lower atmosphere is comprised of A Hydrogen B Carbon dioxide C Oxygen D Nitrogen Answer : D Explanation :
32.
 The percentage of carbon in cast iron is : A 0.01 to 0.25 B 0.5 to 1.5 C 6 to 8 D 3 to 5 Answer : D Explanation :
33.
 Iron rusts quickly in A Rain water B Sea water C Distilled water D River water Answer : B Explanation :
34.
 Aerated water contains A $SO_{2}$ B $NO_{2}$ C $H_{2}$ D $CO_{2}$ Answer : D Explanation :
35.
 Magnetite is A $Fe_{2}&space;O_{3}$ B $Fe_{3}&space;O_{4}$ C $FeCO_{3}$ D 2Fe2O3. 3H2O Answer : B Explanation :
36.
 In an oxygen molecule, two atoms are united by A One bond B Two bonds C Three bonds D Four bonds Answer : B Explanation :
37.
 White phosphorus is generally kept under A Alcohol B Water C Glycerine D Kerosene oil Answer : B Explanation :
38.
 The wire of flash bulbs is made up of A Mg B Ba C Cu D Ag Answer : A Explanation :
39.
 The major use of sulphur is in the manufacture of A $H_{2}&space;SO_{4}$ B $H_{2}&space;S$ C $SO_{2}$ D Fungicide Answer : A Explanation :
40.
 Which one of the following elements exhibits the greatest tendency to lose electrons ? A Fluorine B Lithium C Oxygen D Zinc Answer : B Explanation :
41.
 The element absorbed both in cation and anion form is A Sulphur B Nitrogen C Calcium D Phosphorus Answer : B Explanation :
42.
 Which of the following is not a greenhouse gas ? A Water vapour B $O_{2}$ C $O_{3}$ D $CO_{2}$ Answer : B Explanation :
43.
 The metal used for making aircrafts and rockets is A Lead B Aluminium C Nickel D Copper Answer : C Explanation :
44.
 Which of the following is not a noble gas ? A Hydrogen B Helium C Neon D Argon Answer : A Explanation :
45.
 Which of the following is very reactive and kept in kerosene ? A Sodium B Potassium C Iodine D Bromine Answer : A Explanation :
46.
 Which of the following is a metallic ore ? A Mica B Quartz C Feldspar D Galena Answer : D Explanation :
47.
 The inert gas used as beacon light is A Kr B Ar C He D Ne Answer : D Explanation :
48.
 Which one of the following mineral does not contain oxygen ? A Haematite B Bauxite C Cryolite D Calcite Answer : C Explanation :
49.
 A non – electronic conductor is A Iron B Gas carbon C Copper sulphate D Mercury Answer : Select Correct Ans Explanation :
50.
 Which of the following will replace hydrogen from acids to form salts ? A S B Na C Ag D P Answer : B Explanation :
51.
 Which of the following metals has least melting point ? A Gold B Silver C Mercury D Copper Answer : C Explanation :
52.
 Carborundum is another name of A Silicon carbide B Silicon oxide C Calcium carbide D Calcium oxide Answer : A Explanation :
53.
 Which is the purest commercial form of iron ? A Pig iron B Steel C Stainless steel D Wrought iron Answer : D Explanation :
54.
 Which one of the following contains maximum percentage of carbon ? A Cast iron B Stainless steel C Wrought iron D High speed steel Answer : A Explanation :
55.
 Which one of the following elements is an example of noble gas ? A Nitrogen B Hydrogen C Chlorine D Helium Answer : D Explanation :
56.
 The most abundant element is A Calcium B Silicon C Oxygen D Nitrogen Answer : C Explanation :
57.
 Nitrogen in water is commonly found in the form of A Nitrous oxide B Nitrate C Nitric oxide D Nitrite Answer : B Explanation :
58.
 Which element behaves chemically both as metal and non-metal ? A Argon B Boron C Xenon D Carbon Answer : B Explanation :
59.
 The amount of oxygen in the atmosphere remains relatively constant because it is given off by A Oceans B Animals C Rocks D Plants Answer : D Explanation :
60.
 Which of the following elements is obtained from sea weeds ? A Iodine B Vanadium C Argon D Sulphur Answer : A Explanation :
61.
 Heavy metals got their name because compared to other atoms they have A Higher densities B Higher atomic masses C Higher atomic numbers D Higher atomic radii Answer : B Explanation :
62.
 Ultra purification of a metal is done by : A Slugging B Zone melting C Smelting D Leaching Answer : B Explanation :
63.
 The soft silvery metallic element which ionizes easily when heated or exposed to light and is present in atomic clocks is : A Cerium B Cesium C Calcium D Californium Answer : B Explanation :
64.
 Catalytic converters are generally made from : A Alkaline metals B Hydrogen C Transition metals D Carbon Answer : C Explanation :
65.
 Which one of the following is not coal variety ? A Lignite B Bituminous C Dolomite D Peat Answer : C Explanation :
66.
 Air is said to be saturated when : A It contains maximum content of water vapour B Its pressure is minimum C Its thickness is maximum D It blows over the barren land Answer : A Explanation :
67.
 The most abundant element by number in the living system is : A Nitrogen B Hydrogen C Oxygen D Carbon Answer : B Explanation :
68.
 The “King of Metals” is  : A Gold B Silver C Iron D Aluminium Answer : A Explanation :
69.
 The gas dissolved in water that makes it basic is : A Ammonia B Sulphur dioxide C Hydrogen D Carbon dioxide Answer : A Explanation :
70.
 Which of the following is not a gaseous air pollutant ? A Oxides of nitrogen B Hydrocarbon C Smoke D Oxides of sulphur Answer : B Explanation :
71.
 The most abundant metal in the Earth’s crust is A Copper B Zinc C Aluminium D Iron Answer : C Explanation :
72.
 Helium is added to the oxygen supply of deep sea divers because it is A Less poisonous than nitrogen B Lighter than nitrogen C Readily miscible with oxygen D Less soluble in blood than nitrogen at high pressure Answer : D Explanation :
73.
 What is used in storage batteries ? A Copper B Tin C Lead D Zinc Answer : C Explanation :
74.
 _________  gives hardness to stainless steel. A Zinc B Lead C Carbon D Tin Answer : C Explanation :
75.
 Activated Charcoal is used to remove colouring matter from pure substances by A Bleaching B Oxidation C Adsorption D Reduction Answer : C Explanation :
76.
 Phosphorus is kept in water because A Its ignition temperature is very high B Its ignition temperature is very low C Its critical temperature is high D Its critical temperature is low Answer : B Explanation :
77.
 Nitrification is the biological process of converting A N2 into nitrate B N2 into nitrite C Ammonia into nitrite D Ammonia into N2 Answer : C Explanation :
78.
 Which of the following is not a donor atom ? A Phosphorus B Antimony C Arsenic D Aluminium Answer : D Explanation :
79.
 Which one of the following non-metals shows allotropy in the liquid state ? A Carbon B Sulphur C Phosphorous D Bromine Answer : B Explanation :
80.
 Silver gets corroded due to  _________  in air. A Oxygen B Hydrogen Sulphide C Carbon dioxide D Nitrogen Answer : B Explanation :