## general science

### Chemistry MCQ Questions and Answers page - 3

1.
 Which one of the following metals does not react with water to produce Hydrogen ? A Potassium B Cadmium C Sodium D Lithium Answer : B Explanation :
2.
 Ozone consists of A Oxygen only B Oxygen and Nitrogen C Hydrogen and Carbon D Oxygen and Carbon Answer : A Explanation :
3.
 An atomic clock is based on transitions in A Sodium B Caesium C Magnesium D Aluminium Answer : B Explanation :
4.
 The material used in the manufacture of lead pencil is A Graphite B Lead C Carbon D Mica Answer : A Explanation :
5.
 If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by A Mercury B Lead C Iron D Arsenic Answer : B Explanation :
6.
 The noble gas used in radiotherapy is A Neon B Argon C Radon D Xenon Answer : C Explanation :
7.
 White phosphorus is always kept under A Benzene B Kerosene C Ether D Water Answer : D Explanation :
8.
 Galena is a mineral of A Iron B Gold C Lead D Calcium Answer : C Explanation :
9.
 Magnesium is an alloy of A Aluminium and Magnesium B Magnesium and Tin C Aluminium and Zinc D Manganese and Magnesium Answer : A Explanation :
10.
 Two elements which are used to absorb neutrons to control thr chain reaction during nuclear fission are A Boron and cadmium B Boron and plutonium C Cadmium and uranium D Uranium and boron Answer : A Explanation :
11.
 Supersonic jet causes pollution by thinning of A $O_{3}&space;-&space; B $O_{2}&space;-&space; C $SO_{2}&space;-&spac D $CO_{2}&space;-&spac Answer : A Explanation :
12.
 Which of the following metals causes Itai-Itai disease ? A Cadmium B Cobalt C Chromium D Copper Answer : A Explanation :
13.
 Which one of the following minerals is found in monazite sand ? A Potassium B Uranium C Thorium D Sodium Answer : C Explanation :
14.
 Now-a-says yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ? A Sodium B Neon C Hydrogen D Nitrogen Answer : A Explanation :
15.
 Which of the following could be used as fuel in propellant or rockets ? A Liquid Hydrogen + Liquid Nitrogen B Liquid Oxygen + Liquid Argon C Liquid Nitrogen + Liquid Oxygen D Liquid Hydrogen + Liquid Oxygen Answer : D Explanation :
16.
 Hard steel contains A 2 to 5 per cent carbon B 0.5 to 1.5 per cent carbon C 0.1 to 0.4 per cent carbon D 0.01 to 0.04 per cent carbon Answer : B Explanation :
17.
 Cement is formed by strongly heating a mixture of A Limestone and graphite B Limestone and clay C Chalk and graphite D Clay and graphite Answer : B Explanation :
18.
 Glass is a A Superheated solid B Supercooled liquid C Supercooled gas D Superheated liquid Answer : B Explanation :
19.
 A Balloon filled with helium rises in air because A Air exerts an upward force on the balloon B The balloon is weightless C Helium is less dense than air D Helium pushes down on the air below the balloon Answer : C Explanation :
20.
 Which of the toxic heavy metals is found in modern tannery industries ? A Nickel B Zinc C Chromium D Lead Answer : C Explanation :
21.
 Which of the following contains high content of lead ? A Coal B Cooking gas C High octane fuel D Low octane fuel Answer : C Explanation :
22.
 Stainless steel is an alloy of A Chromium and carbon B Chromium, carbon and iron C Chromium and iron D Carbon and iron Answer : B Explanation :
23.
 Which of the following is used in welding broken pieces of iron rails and machine parts ? A Aluminium sulphate B Solder C Aluminium power D None of the above Answer : C Explanation :
24.
 The metals commonly used for electroplating are A Gold, Sodium and Chromium B Chromium, Copper and Nickel C Nickel, Lead and Chromium D Gold, Sodium and Potassium Answer : B Explanation :
25.
 Which of the following in automobile exhaust can cause cancer ? A Oxides of nitrogen B Carbon monoxide C Lead D Polyclinic hydrocarbons Answer : D Explanation :
26.
 Electric bulbs are filled with : A Nitrogen B Carbon dioxide C Argon D Oxygen Answer : C Explanation :
27.
 The purest form of Iron is : A Cast iron B Steel C Pig iron D Wrought iron Answer : D Explanation :
28.
 The gas that is used in the manufacture of Vanaspati ghee is : A Oxygen B Carbon dioxide C Hydrogen D Nitrogen Answer : C Explanation :
29.
 An example of semiconductor is A German silver B Germanium C Phosphorous D Arsenic Answer : B Explanation :
30.
 Sea weeds are important source of A Iron B Chlorine C Bromine D Iodine Answer : D Explanation :
31.
 Slag is a name given for A Molten iron B Molten sand C Molten alumina D Molten calcium silicate Answer : C Explanation :
32.
 Which one of the following gases has the highest calorific value ? A Natural gas B Water gas C Coal gas D Indene gas Answer : D Explanation :
33.
 Which one of the following minerals is found in pure form ? A Iron B Copper C Bauxite D Manganese Answer : B Explanation :
34.
 Among the fuels given below, the one with highest calorific value is A Coke B Coal C Wood D Natural gas Answer : D Explanation :
35.
 Coal is formed from A Crude oil B Deposit of animal waste C Coke D Compressed and hardened biomass Answer : D Explanation :
36.
 Colour imparted to the Bunsen flame by strontium salt is A Bluish green B Apple green C Brick red D Crimson red Answer : D Explanation :
37.
 The chemical name of “laughing gas” is A Nitric oxide B Nitrogen dioxide C Nitrogen pentoxide D Nitrous oxide Answer : D Explanation :
38.
 Brass is an alloy of A Lead and tin B Zinc and copper C Antimony, tin and lead D Zinc, tin and copper Answer : B Explanation :
39.
 Which one of the following pairs is NOT correctly matched ? A Haematite : Copper B Bauxite : Aluminium C Monazite : Thorium D Pitch blende : Uranium Answer : A Explanation :
40.
 The charcoal used to decolourise brown sugar solution is A Wood charcoal B Coconut charcoal C Animal charcoal D Sugar charcoal Answer : C Explanation :
41.
 Which one of the following is used for dating very old objects of archaeological importance ? A Phosphorus – 31 B Tritium C Radium D Carbon – 14 Answer : D Explanation :
42.
 Chemically ‘Quick Silver’ is known as A Mercury B Silver C Gold D Copper Answer : A Explanation :
43.
 Which of the following gases is mixed with oxygen for breathing by divers in aqualungs ? A Methane B Nitrogen C Helium D Hydrogen Answer : B Explanation :
44.
 Among the following which is always found in free-state in nature ? A Gold B Silver C Sodium D Copper Answer : A Explanation :
45.
 Hardest allotrope of carbon is A Diamond B Graphite C Coke D Lamp black Answer : A Explanation :
46.
 Which metal does not undergo corrosion due to the formation of oxide layer ? A Copper B Iron C Aluminium D Zinc Answer : C Explanation :
47.
48.
 Name two elements that find wide application in transistor industry A Silicon and Germanium B Carbon and Platinum C Iridium and Germanium D Tungsten and Platinum Answer : A Explanation :
49.
 An inert gas mixed with oxygen given to patients suffering from restricted breathing is A Helium B Krypton C Radon D Argon Answer : A Explanation :
50.
 An example of major air pollutant is A Oxygen B Carbon monoxide C Helium D Carbon dioxide Answer : B Explanation :
51.
 Among the following the hardest metal is A Gold B Iron C Platinum D Tungsten Answer : D Explanation :
52.
 The material used in solar cells contains A Tin B Silicon C Caesium D Thallium Answer : B Explanation :
53.
 Which one of the following elements is least likely to be found in commercial fertilisers ? A Nitrogen B Phosphorous C Potassium D Silicon Answer : D Explanation :
54.
 The wire of flash bulb is made of : A Copper B Barium C Magnesium D Silver Answer : C Explanation :
55.
 The coloured discharge tubes for advertisement mainly contain A Xenon B Argon C Helium D Neon Answer : D Explanation :
56.
 What is the most common salt in sea water ? A Calcium carbonate B Potassium chloride C Sodium chloride D Magnesium sulphate Answer : C Explanation :
57.
 Which one of the following is a renewable source of energy ? A Coal B Geothermal power C Natural gas D Uranium Answer : B Explanation :
58.
 Which one of the following is a micro-element ? A Chlorine B Hydrogen C Nitrogen D Oxygen Answer : A Explanation :
59.
 Rock salt is a mineral containing A Potassium B Magnesium C Sodium D Iron Answer : C Explanation :
60.
 Which one of the following metals occurs in free state ? A Copper B Iron C Zinc D Lead Answer : A Explanation :
61.
 Copper is refined by A Roasting B Oxidation C Electrolysis D Zone refining Answer : A Explanation :
62.
 The element with highest first ionisation energy is A Hydrogen B Helium C Lithium D Sodium Answer : B Explanation :
63.
 Carbon dioxide is A A reducing agent B A oxidising agent C A dehydrating agent D A bleaching agent Answer : A Explanation :
64.
 Seaweeds are important source of A Fluorine B Chlorine C Bromine D Iodine Answer : D Explanation :
65.
 The resources which can be used continuously, year-after-year are called A Biotic B Abiotic C Non-renewable D Renewable Answer : D Explanation :
66.
 When Hydrogen starts burning in air, it produces ? A Ammonia B Water C Methane D Carbonic Acid Answer : B Explanation :
67.
 Mercury is a : A Solid metal B Liquid metal C Solid non-metal D Liquid non-metal Answer : B Explanation :
68.
 Which gas is used for converting vegetable oils into saturated fats ? A $H_{2}$ B $O_{2}$ C $Cl_{2}$ D $SO_{2}$ Answer : A Explanation :
69.
 Iodine can be separated from a mixture of Iodine and Potassium Chloride by A Sedimentation B Filtration C Sublimation D Distillation Answer : C Explanation :
70.
 Identify the metal which is non toxic in nature. A Chromium B Gold C Cadmium D Cobalt Answer : B Explanation :
71.
 The most reactive among the halogens is A Fluorine B Chlorine C Bromine D Iodine Answer : A Explanation :
72.
 Which one of the inert gases can form compounds ? A Helium B Xenon C Krypton D Argon Answer : B Explanation :
73.
 Which one of the following element is used in the manufacture of fertilizers ? A Fluorine B Potassium C Lead D Aluminium Answer : B Explanation :
74.
 In addition to hydrogen, the other abundant element present on Sun’s surface is A Helium B Neon C Argon D Oxygen Answer : A Explanation :
75.
 Ozone layer is present in A Troposphere B Ionosphere C Stratosphere D Exosphere Answer : C Explanation :
76.
 An electric iron has a heating element made of : A Copper B Tungsten C Nichrome D Zinc Answer : C Explanation :
77.
 Which one of the following is not a method of preparing oxygen ? A Electrolysis of water B Fractional distillation of liquid air C Decomposition of potassium permanganate D Decomposition of manganese dioxide Answer : D Explanation :
78.
 Which one of the following is not a characteristic feature of alloys ? A Compounds B Mixtures C Solutions D Homogeneous systems Answer : A Explanation :
79.
 Find the odd one : A Marble B Chalk C Limestone D Slaked lime Answer : D Explanation :
80.
 Maximum permissible concentration of copper in drinking water in mg/L is A 0.01 B 0.05 C 1.0 D 2.0 Answer : C Explanation :