## general science

### Chemistry MCQ Questions and Answers page - 7

1.
 Taj Mahal is greatly affected due to  : A Tourists B Acid rain C Deforestation D Sound pollution Answer : B Explanation :
2.
 Chemical name of bleaching powder is  : A Calcium chlorate B Calcium hypochlorite C Calcium chloro-hypochlorite D Calcium bi chloride Answer : B Explanation :
3.
 The gas that usually causes explosions in coal mines is A Hydrogen B Carbon monoxide C Air D Methane Answer : D Explanation :
4.
 A powerful eye irritant present in smog is A Nitric oxide B Sulphur dioxide C Peroxyacetyl nitrate D Carbon dioxide Answer : C Explanation :
5.
 When water itself combines chemically with some element or mineral it is called A Carbonation B Desilication C Hydration D Oxidation Answer : C Explanation :
6.
 KMnO4  can be used as a/an A Insecticide B Fertiliser C Pesticide D Disinfectant Answer : D Explanation :
7.
 The chief source for the production of nitrogeneous fertilizers is  : A Ammonia B Nitric acid C Nitrogen D Nitrogen dioxide Answer : A Explanation :
8.
 Bleaching powder is prepared by passing  : A Chlorine over slaked lime B Oxygen over slaked lime C Carbon dioxide over slaked lime D Chlorine over quick lirne Answer : A Explanation :
9.
 Permanent – hardness of water may be removed by addition of A Alum B Sodium carbonate C Lime D Potassium Permanganate Answer : B Explanation :
10.
 One property of ammonia is A It is insoluble in water B It is a odourless gas C It is a yellowish gas D Its aqueous solution turns red litmus blue Answer : D Explanation :
11.
 Water gas is the mixture of A Carbon dioxide and hydrogen B Carbon monoxide and nitrogen C Carbon monoxide and hydrogen D Carbon dioxide and nitrogen Answer : C Explanation :
12.
 Which of the following is not a  ‘green house gas’  ? A Chlorofluorocarbons B Methane C Carbon dioxide D Nitrogen Answer : D Explanation :
13.
 Black lung disease occurs in people working in A Electroplating industry B Organic solvents industry C Paint manufacturing industry D Coal mines Answer : D Explanation :
14.
 The chemical substance present in bones and teeth is A Calcium phosphate B Calcium chloride C Calcium sulphate D Calcium borate Answer : A Explanation :
15.
 If lime water is kept in the air, it turns milky due to presence of  : A Carbon dioxide B Nitrogen C Oxygen D Sulphur-dioxide Answer : A Explanation :
16.
 Brine refers to  : A Salt water B Sweet water C Pure water D Starch water Answer : A Explanation :
17.
 Which of the following imparts a blue colour to glass  ? A Cobalt oxide B Copper oxide C Iron oxide D Nickel oxide Answer : A Explanation :
18.
 The most common cause of pollution of air is A Carbon dioxide B Carbon monoxide C Sulphur dioxide D Smoke Answer : C Explanation :
19.
 Philosopher’s  wool is chemically A Aluminium oxide B Magnesium oxide C Zinc oxide D Calcium oxide Answer : C Explanation :
20.
 Acid rain is caused due to pollution of atmosphere by A Oxide of carbon and nitrogen B Oxide of nitrogen and sulphur C Oxide of nitrogen and phosphorous D None of these Answer : B Explanation :
21.
 Ferrous sulphate is used in water treatment as  a/an A Oxidizing agent B Reducing agent C Coagulant aid D Adsorbent Answer : C Explanation :
22.
 Sulphur dioxide level in the atmosphere can be reduced by using A More efficient car engines B Catalytic converters in industry C Static electricity to attract it in factory chimneys D Low – sulphur fuels Answer : D Explanation :
23.
 Glass is soluble in A $H_{2}SO_{4}$ B $HClO_{4}$ C $HNO_{3}$ D $HF$ Answer : D Explanation :
24.
 Sulphuric acid is A Monobasic B Dibasic C Tribasic D Tetrabasic Answer : B Explanation :
25.
 Which of the following group of gases contribute to the  “Green House Effect”  ? A Carbon dioxide and Methane B Ammonia and Ozone C Carbon monoxide and Sulphur dioxide D Carbon tetrafluoride and Nitrous oxide Answer : A Explanation :
26.
 A thick paste of cement, sand and water is called A Concrete B R.C.C. C Mortar D Kiln Answer : C Explanation :
27.
 Which of the following is not a chemical reaction  ? A Burning of paper B Digestion to of food C Conversion of water into steam D Burning of coal Answer : C Explanation :
28.
 Which of the following is used as anesthetic  ? A $NH_{3}$ B $NO$ C $NO_{2}$ D $N_{2}O$ Answer : B Explanation :
29.
 Antacids are found in drugs that give relief to A Eye sight B Stomach ache C Acne D Headache Answer : B Explanation :
30.
 Browning of paper in old books is caused by A Frequent use B Lack of aeration C Collection of dust D Oxidation of cellulose Answer : D Explanation :
31.
 The pair of compounds used as anaesthetic in medicines  : A Ether,  Ammonia B Nitrous oxide,  Chloroform C Chloroform,  Nitrogen dioxide D Nitrogen dioxide,  Ether Answer : B Explanation :
32.
 Antacid tablets consist of A Hydroxides of sodium,  magnesium and aluminium B Hydroxides of magnesium and aluminium C Hydroxides of sodium and aluminium D Hydroxides of magnesium and sodium Answer : B Explanation :
33.
 Interveinal necrotic spots on leaves appear due to A HF  - injury B $SO_{2}&space;-&spa C $NO_{2}&space;-&spa D $O_{3}&space;-&space Answer : B Explanation :
34.
 The alkaloid naturally found in coffee, coco and cola nut is A Cocaine B Morphine C Tannin D Caffeine Answer : D Explanation :
35.
 The chemical name of  “Plaster of Paris” commonly used for setting broken bones is A Calcium nitrate B Calcium sulphate C Calcium carbonate D Calcium chloride Answer : B Explanation :
36.
 Chemical formula of washing soda is A Na2SO4.10H2O B $NaHCO_{3}$ C $Ca(OH)_{2}$ D Na2CO3 .10H2O Answer : D Explanation :
37.
 Hydrochloric acid is also known as A Galic acid B Picric acid C Muriatic acid D Chloric acid Answer : C Explanation :
38.
 The gas produced in marshy places due to decomposition of vegetation is A Carbon monoxide B Carbon dioxide C Sulphur dioxide D Methane Answer : D Explanation :
39.
 The chemical name of  “Hypo”  commonly used in photography is A Sodium thiosulphate B Silver nitrate C Sodium nitrate D Silver iodide Answer : A Explanation :
40.
 Aluminium salt commonly used to stop bleeding is A Aluminium nitrate B Aluminium sulphate C Aluminium Chloride D Potash alum Answer : B Explanation :
41.
 Water gas is the combination of A CO and H2 B CO2 and H2 C CO and H2O D CO2 and CO Answer : A Explanation :
42.
 Carbon footprint can be reduced by A All of these B Recycling waste materials C Using energy efficient appliances D Commuting by public transport Answer : A Explanation :
43.
 Peroxyacetyl nitrate is a A Acidic dye B Plant hormone C Vitamin D Secondary pollutant Answer : D Explanation :
44.
 The term  ‘brown air’  is used for A Acid fumes B Photochemical smog C Sulphurous smog D Industrial smog Answer : B Explanation :
45.
 Most commonly used bleaching agent is A Sodium chloride B Alcohol C Carbon dioxide D Chlorine Answer : D Explanation :
46.
 Cyanide poisoning causes death in seconds because A It denatures enzymes of the heart/muscle B It breaks the electron transport chain C It causes Lysis of red blood cells D It causes cardiac arrest Answer : D Explanation :
47.
 Photo chemical smog is a resultant of the reaction among A High concentration of  NO2, O3, and CO in the evening B CO, CO2 and NO2 at low temperature. C CO, O2 and peroxy-acetyl nitrate in the presence of Sunlight D NO2, O3 and peroxy-acetyl nitrate in the presence of Sunlight Answer : D Explanation :
48.
 The green colour seen in firework displays is due to the chloride salt of  : A Sodium B Strontium C Barium D Calcium Answer : C Explanation :
49.
 Chemical composition of heavy water is  : A $H_{2}O_{2}$ B $H_{2}O$ C $HDO$ D $D_{2}O$ Answer : D Explanation :
50.
 The acid which fails to liberate carbon dioxide from sodium bicarbonate is  : A Acetic acid B Formic acid C Carbonic acid D Sulphuric acid Answer : D Explanation :
51.
 Dry ice is the solid form of  : A Air B Carbon dioxide C Nitrogen D Water Answer : B Explanation :
52.
 The gas that causes suffocation and death when coal or coke is burnt in a closed room is A Methane B Ethane C Carbon monoxide D Carbon dioxide Answer : C Explanation :
53.
 Organic food is supposed to be better for human consumption because  : A It is grown in glass house  &  air tight environment. B It is grown without the use of chemicals  &  synthetic pesticides. C It depends on chemicals  &  fertilizers. D It is too expensive to buy. Answer : B Explanation :
54.
 The main component of liquid bleach is  : A Sodium chloride B Sodium hypochlorite C Hydrochloric acid D Sodium hypochlorite Answer : B Explanation :
55.
 Chile salt-peter is the common name of  : A Sodium nitrate B Potassium nitrite C Potassium nitrate D Sodium nitrite Answer : A Explanation :
56.
 Stalactites and Stalagmites form due to the precipitation of  : A $CaCO_{3}$ B $CaCl_{2}$ C $MgCl_{2}$ D $MgCO_{3}$ Answer : A Explanation :
57.
 An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a  : A Power transmitter B Battery C Uninterrupted power supply (UPS) D Generator Answer : B Explanation :
58.
 An acid having basicity one is A Sodium dihydrogen phosphate B Disodium hydrogen phosphate C Sodium phosphate D Phosphoric acid Answer : B Explanation :
59.
 Which method will be employed to test the hardness of water  ? A Boiling B Distillation C Formation of lather with soap D None of these Answer : C Explanation :
60.
 Which of the following is the main compound of voter ink  ? A Silver nitrate B Ammonium Chloride C Silver Chloride D Ammonium Nitrate Answer : A Explanation :
61.
 What do you understand by the term Espuma  ? A Foam B Soap C Salt D Calcium Answer : A Explanation :
62.
 Limestone is a raw material used by which industry  ? A Aluminium B Fertilizers C Cement D Petrochemicals Answer : C Explanation :
63.
 Copper substances when exposed to air gains a green coating due to the formation of  : A $(a)&space;CuO$ B $CuCO_{3}.Cu(OH)_{2}$ C $CuSO_{4}$ D $Cu\left& Answer : B Explanation :
64.
 Which of the following vitamins is generally excreted by human in urine  ? A Vitamin B B Vitamin C C Vitamin D D Vitamin E Answer : A Explanation :
65.
 What is Zeolite  ? A Hydrated Aluminosilicate B Hydrated Calcium Sulphate C Dehydrated Aluminosilicate D Dehydrated Calcium Sulphate Answer : A Explanation :
66.
 Which of the following is not soluble in water  ? A Lead Sulphate B Zinc Sulphate C Potassium Sulphate D Sodium Sulphate Answer : B Explanation :
67.
 Sea water is saltier than rain water because A Sea animals are salt producing B The air around the sea is saltish C Rivers wash away salts from earth and pour them into the sea D Sea beds have salt producing mines Answer : C Explanation :
68.
 Which of the following is not a nitrogenous fertiliser  ? A Ammonium sulphate B Urea C Ammonium nitrate D Superphosphate Answer : D Explanation :
69.
 When iron rusts, its weight A Decreases B Increases C Remain the same D First increases and then decreases Answer : B Explanation :
70.
 Silica gel is a A Moisturizer B Flavouring agent C Drying agent D Delicious food Answer : C Explanation :
71.
 What is the product formed when sodium bicarbonate is heated strongly  ? A Sodium Carbonate B Sodium Hydroxide C Sodium Peroxide D Sodium Monoxide Answer : A Explanation :
72.
 The chemical that is used to ripen mangoes is A Calcium sulphide B Calcium carbide C Calcium carbonate D Calcium chloride Answer : B Explanation :
73.
 Which one of the following is commonly used for pulp bleaching in the paper industry  ? A Mild sulphuric acid B Glucose isomerase C Hydrogen peroxide D Iodine and water Answer : C Explanation :
74.
 Which of the following gases is known as  “Laughing Gas”  ? A Nitrous oxide B Nitrogen peroxide C Nitrogen D Nitric oxide Answer : A Explanation :
75.
 The compound used in prickly-heat power to prevent excessive sweating is A Boric acid B Phosphoric acid C Carbonic acid D Sulphonic acid Answer : A Explanation :
76.
 Which of the following acts as best adsorbent  ? A Charcoal B Activated Charcoal C Activated Coconut Charcoal D Carbon black Answer : C Explanation :
77.
 Nitrogen fixation is a process of A Assimilation of nitrate B Utilisation of nitrogen gas C Conversion of organic nitrogen to proteins D Conversion of organic nitrogen to ammonia Answer : D Explanation :
78.
 Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom  ? A Nitrite B Ammonia C Nitrate D Laughing gas Answer : B Explanation :
79.
 The chemical formula of Acetic acid is  _____________ . A $CH_{3}COH$ B $CH_{3}COOH$ C $CH_{3}COCH_{3}$ D $CH_{2}COOH$ Answer : B Explanation :
80.
 The common name of sodium tetraborate decahydrate is  ___________ . A Epsom salt B Gypsum C Borax D Galena Answer : C Explanation :
81.
 What is the chemical formula for Sodium Chloride (Salt)  ? A $NaCl_{2}$ B $NaCl$ C $Na_{2}Cl$ D $Na_{2}C$ Answer : B Explanation :