## general science

### Chemistry MCQ Questions and Answers page - 5

1.
 Nitric acid does not react with A Gold B Copper C Zinc D Iron Answer : A Explanation :
2.
 In arc welding. Argon is used because of its A Low reactivity with metal B Ability to lower the melting point of the metal C High flammability D High calorific value Answer : A Explanation :
3.
 Inert gases are A Miscible with water B Not stable C Chemically  unreactive D Chemically very active Answer : C Explanation :
4.
 The most pure form of Carbon among the options is A Anthracite B Lampblack C Graphite D Wood Charcoal Answer : C Explanation :
5.
 Calcium salts used as fertilizer is : A Calcium carbide B Calcium Carbonate C Calcium Cyanide D Calcium Sulphate Answer : D Explanation :
6.
 Which one of the following forms of phosphorus is most reactive ? A Black phosphorus B White phosphorus C Violet phosphorus D Red phosphorus Answer : B Explanation :
7.
 The manufacturing of iron from iron-ore involves the process of A Oxidation B Reduction C Electrolysis D Fractional distillation Answer : B Explanation :
8.
 Bridgmanite is A A bridge on the river Thames B Name of a game C Earth’s most abundant mineral D Name of a music Answer : C Explanation :
9.
 Iron and manganese present as pollutants in water cannot be removed by  __________ A Oxidation followed by settling and filtration B Chlorination C Ion exchange process D Lime soda process or manganese zeolite process Answer : B Explanation :
10.
 Of the following commonly used materials, the one that is not an alloy is A Steel B Brass C Bronze D Copper Answer : D Explanation :
11.
 Bronze is an alloy of A Copper & tin B Copper & zinc C Copper & iron D Iron & nickel Answer : A Explanation :
12.
 Chemical composition of cement is A Limestone and Clay B Limestone, Clay and Gypsum C Limestone and Gypsum D Clay and Gypsum Answer : B Explanation :
13.
 Cinnabar is an ore/mineral of A Lead B Manganese C Molybdenum D Mercury Answer : D Explanation :
14.
 Which among the following is not a characteristic of transition metals ? A Tendency to gain electrons B Low electronegativity C Low ionization energy D Malleability Answer : A Explanation :
15.
 Malachite is an ore/mineral of A Lead B Manganese C Mercury D Copper Answer : D Explanation :
16.
 Sodium calcium silicate is called  _________ . A Hard glass B Borosilicate glass C Soft glass D Jena glass Answer : C Explanation :
17.
 Which of the following elements has the lowest melting point ? A Sodium B Tin C Radon D Radium Answer : C Explanation :
18.
 Atomic number of which of the following elements is greater than that of Fluorine ? A Sodium B Beryllium C Nitrogen D Boron Answer : A Explanation :
19.
 Which of the following gas is used in bulb ? A Hydrogen B Carbon – dioxide C Carbon – mono – oxide D Argon Answer : D Explanation :
20.
 Chlorine gas is a major component of which of the following ? A Water B Tear gas C Liquefied Petroleum gas D Gobar gas Answer : B Explanation :
21.
 What is Brine solution ? A Excess salt + water B Silver C Excess Ethanol + water D Excess starch + water Answer : A Explanation :
22.
 pH scale ranges from  __________ . A 1 to 14 B 1 to 7 C 0 to 14 D 0 to 7 Answer : C Explanation :
23.
 In which of the following silicon is not used ? A Solar Panels B IC manufacturing C Optical glass D Ink pen Answer : D Explanation :
24.
 Which among the following is added to commercial nitric acid to make it coloured ? A Carbon dioxide B Sulphur dioxide C Coloured impurities D Nitrogen dioxide Answer : D Explanation :
25.
 Bleaching action of Chlorine is due to which reaction ? A Oxidation B Hydrolysis C Redox D Decomposition Answer : A Explanation :
26.
 In Aqua Regia which two acids are mixed in radio of  1 : 3  ? A Hcl  and  HNO3 B Silver C $HNO_{3}&space D $Hcl&space;and& Answer : D Explanation :
27.
 Which of the following are the main components of stainless steel ? A Iron  and  carbon B Silver C Iron, Chromium  and  Nickel D Iron  and  Nickel Answer : C Explanation :
28.
 Which of the following metal has the lowest density ? A Lithium B Iron C Gold D Vanadium Answer : D Explanation :
29.
 Which among the following metal is used for galvanization ? A Zinc B Copper C Iron D Silver Answer : A Explanation :
30.
 What is dry ice ? A Solid Carbon dioxide B Solid nitrogen dioxide C Solid sulphur dioxide D Solid water Answer : A Explanation :
31.
 Which of the following metal (shown by its symbol) is generally used for making filaments of bulb  ? A Fe B An C Ag D W Answer : D Explanation :
32.
 Which of the following is an Inert Gas ? A Hydrogen B Nitrogen C Oxygen D Argon Answer : D Explanation :
33.
 Ozone is an  ________  of oxygen. A Allotrope B Isotope C Isobar D Isotone Answer : A Explanation :
34.
 Which of the following is an ore of Aluminium ? A Galena B Cryolite C Cinnabar D Epsom salt Answer : B Explanation :
35.
 What is the common characteristic of the elements of the same group in the periodic table ? A Electrons in outer most shell B Total number of electrons C Total number of protons D Atomic weight Answer : A Explanation :
36.
 Which of the following cannot be beaten into Sheets ? A Gold B Silver C Potassium D Aluminium Answer : C Explanation :
37.
 In an acid base reaction which product is produced along with a salt ? A Hydrogen gas B Oxygen gas C Carbon dioxide D Water Answer : D Explanation :
38.
 What is the process of melting also called ? A Fusion B Galvanisation C Crystallisation D Evaporation Answer : A Explanation :
39.
 Fire extinguishers emit which gas ? A Carbon monoxide B Chlorine C Carbon dioxide D Nitrogen Answer : C Explanation :
40.
 What is formed when Magnesium is burnt ? A Baking Soda B Calcium Carbonate C Ash D Vinegar Answer : C Explanation :
41.
 ________  is obtained by evaporation of sea. A Sugar B Iron C Salt D Steel Answer : C Explanation :
42.
 A  ________  thread is actually stronger than a steel wire. A Wool B Cotton C Jute D Nylon Answer : D Explanation :
43.
 The process of depositing a layer of any desired metal on another material by means of electricity is called  ________ . A Electroplating B Galvanisation C Rusting D Crystallisation Answer : A Explanation :
44.
 What is formed when Carbon Dioxide is passed through Lime Water ? A Copper Sulphate B Calcium Carbonate C Magnesium Oxide D Baking soda Answer : B Explanation :
45.
 The salt concentration (measured as salinity in parts per thousand), is greater than  ________ % in hypersaline lagoons. A 50 B 100 C 150 D 200 Answer : B Explanation :
46.
 What is the reason for the use of Sodium thiosulphate in photography ? A Reaction with light B Ability to form complexion C Oxidizing behaviour D Reducing behaviour Answer : B Explanation :
47.
 Heavy water is made by  ________ . A Dissolving salts of heavy metals in distilled water B Repeated distillation and condensation of water C Burning deuterium in oxygen D By burning the heavier isotope of oxygen in hydrogen Answer : C Explanation :
48.
 Which of the following statements is true ? A Lead is the most hazardous metal pollutant of automobile exhaust. B The toxic effect of Carbon Monoxide is due to its greater affinity for haemoglobin as compared to C Photochemical smog always contains Ozone. D All options are correct. Answer : D Explanation :
49.
 Which one of the following is not a Ferrous mineral ? A Iron ore B Manganese C Chromites D Tungsten Answer : D Explanation :
50.
 An amalgam of metal has which other element ? A C B Au C Ag D Hg Answer : D Explanation :
51.
 Which of the following metal is the heaviest ? A Iron B Silver C Nickel D Osmium Answer : D Explanation :
52.
 Which among the following acids is used in Lead storage batteries ? A Acetic acid B Hydrochloric acid C Sulphuric acid D Nitric acid Answer : C Explanation :
53.
 Which metal remains in liquid form at normal temperature ? A Bromite B Mercury C Cadmium D Glass Answer : B Explanation :
54.
 Which of the following is not a noble gas ? A Radon B Argon C Carbon D Neon Answer : C Explanation :
55.
 Which element has maximum presence in the Sun ? A Hydrogen B Oxygen C Argon D Krypton Answer : A Explanation :
56.
 Substances which are generally bitter in taste and feel soapy on touching are known as  ________ . A Acids B Bases C Indicators D Litmus Answer : B Explanation :
57.
 A substance acquired in the form of brownish film on a piece of iron left in the open for some time is  ________ . A Rust B Salt C Soil D Dust Answer : A Explanation :
58.
 Which among the following elements comes under metalloids ? A Germanium B Zinc C Silver D Gold Answer : A Explanation :
59.
 Which of the following metal is most ductile in nature ? A Copper B Silver C Gold D Aluminium Answer : C Explanation :
60.
 The unique ability of carbon to form bonds with other atoms of carbon is called as  ________ . A Ionization B Catenation C Acid Ification D No option is correct Answer : B Explanation :
61.
 During Galvanization, which metal is used for coasting iron and steel objects, preventing them from rusting ? A Zinc B Copper C Aluminium D Bronze Answer : A Explanation :
62.
 In the modern periodic table metals, metalloids and non metals are found in which block ? A s – Block B p – Block C d – Block D f – Block Answer : B Explanation :
63.
 Cinnabar is ore of which of the following ? A Magnesium B Aluminium C Mercury D Iron Answer : C Explanation :
64.
 Mass  of a hydrogen atom is how many time the mass of an electron ? A 1000 B 8000 C 1837 D 5000 Answer : C Explanation :
65.
 In Modern Periodic Table, while moving left to right across a period, the metallic character  _________ . A Increases B Decreases C Remain same D First increases then decreases Answer : B Explanation :
66.
 Which of the following metal remains in liquid form at room temperature ? A Cadmium B Mercury C Germanium D Tin Answer : B Explanation :
67.
 Which is a base metal of amalgam alloy ? A Aluminium B Mercury C Copper D Zinc Answer : B Explanation :
68.
 Which of the following is the structure of graphite ? A Rigid three – dimensional B Hexagonal C Like Football D No option is correct Answer : B Explanation :
69.
 Which is NOT an inorganic gas ? A Ammonia B Hydrogen sulphide C Methane D Carbon monoxide Answer : C Explanation :
70.
 Which of the following shows exception to the Octet rule ? A Carbon B Boron C Neon D Argon Answer : B Explanation :
71.
 Filament of electric bulbs are generally made of  _________ . A Nichrome B Tungsten C Constantan D Manganin Answer : B Explanation :
72.
 Which method is used to protect iron rusting ? A Oxidation B Galvanisation C Vulcanisation D Reduction Answer : B Explanation :
73.
 Brass is an alloy of which of the following metals ? A Copper and mercury B Copper and zinc C Copper and nickel D Copper and silver Answer : B Explanation :
74.
 Solder is an alloy of which of the following metals ? A Lead and mercury B Lead and antimony C Lead and copper D Lead and tin Answer : D Explanation :
75.
 Iron rusts because of  ________  reaction. A Oxidation B Reduction C Corrosion D Redox Answer : D Explanation :
76.
 Which alloy is made of essentially copper and tin ? A Brass B Bronze C Solder D Ranga Answer : B Explanation :
77.
 Incomplete combustion of a fuel gives poisonous  ________  gas. A Carbon dioxide B Isocynate C Carbon monoxide D Nitrogen Answer : C Explanation :
78.
 What is the value of pH of a neutral solution ? A 7.0 B 6.5 C 7.5 D 6.0 Answer : A Explanation :
79.
 Which base is generally found in soaps ? A Calcium hydroxide B Ammonium hydroxide C Sodium hydroxide D Magnesium hydroxide Answer : C Explanation :
80.
 Which of the following metal is most reactive ? A Potassium B Calcium C Sodium D Zinc Answer : A Explanation :