## general science

### Chemistry MCQ Questions and Answers page - 6

1.
 In Modern Periodic Table, the atomic radius increases  ________ . A While moving from left to right in a period B While moving from right to left in a period C While moving from top to bottom in a period D No option is correct Answer : B Explanation :
2.
 Which of the following statement(s) is/are CORRECT ? A Oxides of non – metals are basic. B Oxides of non – metals are acidic. C Oxides of metals are acidic. D All options are correct. Answer : B Explanation :
3.
 Cement is made hard with A Dehydration B Hydration and dissociation of water C Dissociation  of water D Polymerisation Answer : B Explanation :
4.
 Commercial nitric acid is coloured because it contains dissolved  : A Oxygen B Nitrous oxide C Nitrogen dioxide D Coloured impurities Answer : C Explanation :
5.
 Fertiliser having high nitrogen content is  : A Urea B Ammonium sulphate C Ammonium nitrate D Calcium citrate Answer : A Explanation :
6.
 What is the chemical name for  ‘baking soda’  ? A Sodium carbonate B Sodium bicarbonate C Sodium nitrite D Sodium nitrate Answer : B Explanation :
7.
 Which of the following gases is present under pressure in soft drinks  ? A Oxygen B Nitrogen C Carbon dioxide D Nitrous oxide Answer : C Explanation :
8.
 Table salt gets moist during rainy season because A Sodium chloride is hygroscopic B Sodium chloride is deliquescent C Sodium chloride contains some quantity of sodium iodide D Sodium chloride contains hygroscopic impurities like magnesium chloride Answer : D Explanation :
9.
 Which of the following is used to iodise common salf  ? A Potassium iodide B Iodine C Potassium iodate D Sodium iodide Answer : C Explanation :
10.
 Milk is a colloidal system in which  : A Water is dispersed in fat B Fat is dispersed in water C Fat and water are dispersed in each other D Fat is dissolved Answer : B Explanation :
11.
 The major harmful gas emitted by automobile vehicle which causes air pollution is A Carbon Monoxide B Methane C Carbon dioxide D Ozone gas Answer : C Explanation :
12.
 The acid used in lead storage cells is A Phosphoric acid B Hydrochloric acid C Nitric acid D Sulphuric acid Answer : D Explanation :
13.
 What is  “milk of magnesia”  chemically  ? A Magnesium carbonate B Sodium bicarbonate C Calcium hydroxide D Magnesium hydroxide Answer : D Explanation :
14.
 Soap is prepared by boiling caustic soda with A Alcohol B Kerosene oil C Glycerine D Fats Answer : D Explanation :
15.
 Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid  ? A Methylene blue B Methyl red C Phenolphthaline D Methyl orange Answer : D Explanation :
16.
 Bauxite is an alloy of which of the following metals  ? A Aluminium B Silver C Tin D Iron Answer : A Explanation :
17.
 Which is abundant in Gobar gas  ? A Carbon dioxide B Methane C Oxygen D Hydrogen Answer : B Explanation :
18.
 The advantage of detergents over soaps is A Detergents are soluble in water B Detergents could not give much lather C Detergents give lather even with hard water D Soaps give lather with only soft water Answer : C Explanation :
19.
 Bleaching action of moist sulphur dioxide is because of its A Basic property B Acidic property C Oxidising property D Reducing property Answer : C Explanation :
20.
 Which of the following is a natural dye  ? A Crystal violet B Aniline blue C Alizarin D Phenolphthalein Answer : C Explanation :
21.
 Which amidst the following is not a gem stone  ? A Cat’s-eye B Topaz C Opal D Pearl Answer : A Explanation :
22.
 The metallic constituents of hard water are  : A Magnesium, calcium and tin B Iron, tin and calcium C Calcium, Magnesium and iron D Magnesium, tin and iron Answer : C Explanation :
23.
 The pH of human blood is between  : A 6.5 – 7 B 7.5 – 8 C 8 – 9 D 4.5 – 5 Answer : B Explanation :
24.
 Which of the following imparts deep blue colour to glass  ? A Cobalt oxide B Cupric oxide C Ferrous oxide D Nickel oxide Answer : D Explanation :
25.
 Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere  ? A Nitrous oxide B Carbon dioxide C Chlorofluorocarbon D Sulphur dioxide Answer : C Explanation :
26.
 Which of the following is the main nitrogenous waste in humans  ? A Ammonia B Urea C Uric Acid D Ammonium Nitrate Answer : B Explanation :
27.
 Detergents used for cleaning clothes and utensils contain A Nitrates B Bicarbonates C Sulphonates D Bismuthates Answer : C Explanation :
28.
 Which of the following is a supercooled liquid  ? A Ice Cream B Teflon C Glass D Mercury Answer : C Explanation :
29.
 Which of the following is used to remove rust stains on cloth  ? A Kerosene B Lime C Oxalic acid solution D Petrol Answer : C Explanation :
30.
 Tear gas is  : A Chloroprene B Carbonyl chloride C Nitrous oxide D Bleaching powder Answer : B Explanation :
31.
 Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes  ? A Borax B Saltpetre C Hydrogen peroxide D Sodium chloride Answer : D Explanation :
32.
 Which one of the following is used to restore the colour of old oil-paintings  ? A Ozone B Hydrogen peroxide C Barium peroxide D Sodium peroxide Answer : B Explanation :
33.
 Heat resistant variety of glass is A Pyrex glass B Hard glass C Flint glass D None of these Answer : C Explanation :
34.
 Sour taste of  ‘Coca Cola’  is due to the presence of A Acetic acid B Phosphoric acid C Hydrochloric acid D Formic acid Answer : B Explanation :
35.
 Bhopal gas tragedy is associated with leakage of A Carbon dioxide B Nitrogen dioxide C Sulphur dioxide D Methyl isocyanate Answer : D Explanation :
36.
 Iodized salt is beneficial for A Lowering of blood pressure B Prevention of dehydration C Thyroid function D Salivary glands Answer : C Explanation :
37.
 The acid rain destroys vegetations because it contains A Nitric acid B Ozone C Carbon monoxide D Sulphuric acid Answer : D Explanation :
38.
 The substance most commonly used as a food preservative is A Sodium carbonate B Tartaric acid C Acetic acid D Sodium salt of benzoic acid Answer : D Explanation :
39.
 Which of the following gases is most toxic  ? A Carbon dioxide B Carbon monoxide C Sulphur dioxide D Chlorine Answer : B Explanation :
40.
 ‘Plaster of Paris’  is made by partial dehydration of A Epsom salt B Gypsum salt C Blue vitriol D Green vitriol Answer : B Explanation :
41.
 By-product obtained by soap-industry is A Caustic soda B Glycerol C Naphthalene D Caustic potash Answer : B Explanation :
42.
 For determination of the age of which among the following is carbon dating method used ? A Fossils B Rocks C Trees D 1 & 2 above Answer : D Explanation :
43.
 When conc. H2SO4  is added to dry  KNO3,  brown fumes are evolved. These fumes are due to A $SO_{3}$ B $SO_{2}$ C $NO_{3}$ D $N_{2}&space;O$ Answer : C Explanation :
44.
 Which of the following chemicals is used in photography  ? A Aluminium hydroxide B Silver bromide C Potassium nitrate D Sodium chloride Answer : B Explanation :
45.
 Which of the following is extensively used for sterilizing water  ? A Bleaching power B Alum C Borax powder D Soda powder Answer : A Explanation :
46.
 Cream gets separated out of milk when it is churned. This is due to A Gravitational force B Centripetal force C Centrifugal force D Frictional force Answer : C Explanation :
47.
 The chemical name of  ‘Common salt’  is A Sodium chloride B Sodium nitrate C Ammonium chloride D Calcium chloride Answer : A Explanation :
48.
 Detergents clean surfaces on the principle of A Viscosity B Surface tension C Elasticity D Floatation Answer : B Explanation :
49.
 Ammonal is a mixture of A Aluminium power and ammonium nitrate B Aluminium power and ammonium chloride C Aluminium power and ammonium sulphate D Aluminium power and potassium nitrate Answer : A Explanation :
50.
 What are the major pollutants of cigarette smoke  ? A Carbon monoxide and dioxin B Carbon monoxide and nicotine C Carbon monoxide and benzene D Dioxin and benzene Answer : B Explanation :
51.
 Zinc sulphide is commonly used as A Fungicide B Herbicide C Rodenticide D Deodorant Answer : C Explanation :
52.
 The purest form of water is A Tap water B Rain water C Ground water D Distilled water Answer : B Explanation :
53.
 Mortar is a mixture of water, sand and A Slaked lime B Quick lime C Limestone D Gypsum Answer : A Explanation :
54.
 Silver halides are used in photographic plates because they are A Oxidised in air B Soluble in hypo-solution C Reduced by light D Totally colourless Answer : C Explanation :
55.
 The chemical(s) most commonly used for cloud seeding or  ‘artificial rainmaking’  is/are A Silver Iodide B Sodium Chloride C Dry ice or frozen carbon dioxide D All the above Answer : A Explanation :
56.
 Dry powder fire extinguishers contain A Sand B Sand and sodium carbonate C Sand and potassium carbonate D Sand and sodium bicarbonate Answer : D Explanation :
57.
 Which type of glass is used for making glass reinforced plastic  ? A Pyrex glass B Flint glass C Quartz glass D Fibre glass Answer : D Explanation :
58.
 The constituents of automobile exhaust that can cause cancer is/are  : A Oxides of nitrogen B Carbon monoxide C Polycyclic hydrocarbons D Lead Answer : D Explanation :
59.
 For generation of biogas, the materials commonly used are A Animal wastes B Crop residues C Aquatic plants D Forest residues Answer : A Explanation :
60.
 Raw materials used for the manufacture of glass are A Sand, soda, limestone B Sand, charcoal, soda C Limestone, charcoal, sulphur D Sand, sulphur, soda Answer : A Explanation :
61.
 The  BOD  values of water indicate the A Amount of organic debris B Amount of oxygen used for biochemical oxidation C Amount of oxygen used for biochemical reduction D Amount of ozone used for biochemical oxidation Answer : B Explanation :
62.
 Setting of plaster of parts involves A Dehydration process B Hydration to form other hydrates C Oxidation process D Reduction process Answer : B Explanation :
63.
 The common name for the compound having formal  NaOH  is A Caustic soda B Caustic potash C Soda ash D Sodium hydroxide Answer : A Explanation :
64.
 Which one of the following is found in kidney stones  ? A Sodium oxalate B Calcium oxalate C Sodium chloride D Calcium acetate Answer : B Explanation :
65.
 Bone ash contains A Calcium sulphate B Phosphoric sulphate C Calcium phosphate D Calcium hypophosphate Answer : C Explanation :
66.
 Acid secretion is characteristic of A Buccal cavity B Stomach C Small intestine D Large intestine Answer : B Explanation :
67.
 Which one of the following is not a fertilizer  ? A Ammonium sulphate B Calcium sulphate C Calcium ammonium nitrate D Potassium nitrate Answer : B Explanation :
68.
 A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed  ? A From brown to blue-black B From brown to orange-red C From blue to pink D From pink to blue-green Answer : A Explanation :
69.
 Epsom salt is used A As purgative B In softening water C In paper industry D In making tooth paste Answer : A Explanation :
70.
 The chemical name of rat poison is A Zinc oxide B Potassium cyanide C Lead nitrate D Zinc phosphide Answer : D Explanation :
71.
 Silver nitrate solution is kept in brown bottles in laboratory because A It reacts with ordinary white bottles B Brown bottles stops the passage of light through it C Brown battles do not react with it D Brown battles react with it Answer : B Explanation :
72.
 Gold dissolves in A Hydrochloric acid B Nitric acid C Aqua-regia D Acetic acid Answer : C Explanation :
73.
 The element used in the manufacture of safety matches is A Phosphorous B Magnesium C Silicon D Sulphur Answer : A Explanation :
74.
 When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is A Hydrogen B Oxygen C Carbon dioxide D All of them Answer : C Explanation :
75.
 pH  value between  6.5-7.5  makes the soil A Basic B Neutral C Acidic D None of these Answer : D Explanation :
76.
 When quick lime is added to water A Heat is liberated B Heat is absorbed C Temperature decreases D No heat change takes place Answer : A Explanation :
77.
 This group of aluminosilicate minerals is widely used in making electrical insulators A Bauxite B Chromite C Manganese D Mica Answer : D Explanation :
78.
 The acid which is secreted by the glands in the stomach wall is A Sulphuric acid B Hydrochloric acid C Nitric acid D Phosphoric acid Answer : B Explanation :
79.
 Dry ice is A Solid ammonia B Solid sulphur dioxide C Dry carbon dioxide gas D Solid carbon dioxide Answer : D Explanation :
80.
 Cement containing excess amount of lime A Cracks during setting B Becomes more strong C Is slow setting D Is quick setting Answer : A Explanation :