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- Question 1 of 50
1. Question
Detergents used for cleaning clothes and utensils contain:
Hint
Detergent is a sodium salt of long-chain benzene sulphonic acid or sodium salt of long-chain alkyl hydrogen sulfate, which has cleansing properties in water. Like soaps, Detergents contain anionic groups such as sulphonate groups or sulphate groups and long-chain hydrocarbon, a non-ionic group.
- Question 2 of 50
2. Question
Radioactive disintegration of uranium ultimately results in formation of:
Hint
Radioactive disintegration of uranium ultimately results in formation of lead. The half-life of uranium-238 is 4.5 billion years. It decays into radium-226, which in turn decays into radon-222. Radon-222 becomes polonium-210, which finally decays into a stable nuclide, lead.
- Question 3 of 50
3. Question
Which of the following is used in making smoke bombs?
Hint
Phosphorus is used in making smoke bombs. White phosphorus burns with a brilliant yellow flame while producing ample amounts of white smoke which is phosphorus pentoxide (P4O10).
- Question 4 of 50
4. Question
German silver is an alloy of:
Hint
German Silver is an alloy of copper (60%), zinc (20%) and nickel (20%). It is used for making daily utensils and jewellery.
- Question 5 of 50
5. Question
A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be:
Hint
When copper is exposed to the atmosphere, it becomes coated with green carbonate. Copper when combined with oxygen in the air, forms oxide. Copper carbonate is formed when oxide reacts with CO2, giving it a green tint.
- Question 6 of 50
6. Question
Which of the following is a supercooled liquid?
Hint
Glass is a supercooled liquid. Supercooling is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. It achieves this in the absence of a seed crystal or nucleus around which a crystal structure can form.
- Question 7 of 50
7. Question
Which of the following is used to remove rust stains on cloth?
Hint
Oxalic acid solution is widely used to remove rust stains on cloth. When removing rusts, it converts most insoluble iron compounds into a soluble complex ion.
- Question 8 of 50
8. Question
Curd is sour due to the presence of:
Hint
Lactic Acid is an organic acid with the chemical formula C3H6O3. Curd is sour due to the presence of Lactic acid. When milk sugar or lactose undergoes fermentation, the product obtained is lactic acid.
- Question 9 of 50
9. Question
Tear gas is:
Hint
Tear gas is Chloropicrin. Chloropicrin (PS) is an irritant with characteristics of a tear gas. It has an intensely irritating odor. Its vapours are irritating to the skin, eyes, and upper respiratory tract, and it has been used in chemical warfare and as a tear gas.
- Question 10 of 50
10. Question
Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
Hint
Hydrogen peroxide is an antiseptic frequently used to clean minor cuts or disinfect surfaces. Gargling with hydrogen peroxide may help treat minor mouth irritations, such as cuts or canker sores because it is an antiseptic. In fact, many types of toothpaste and mouthwash in stores already contain this compound.
- Question 11 of 50
11. Question
Which one of the following is used to restore the colour of old oil paintings?
Hint
Hydrogen peroxide is a chemical compound with the formula H2O2. It is used as an oxidizer, bleaching agent, and antiseptic. When an old oil painting is coated with hydrogen peroxide, it oxidised lead sulphide to form lead sulphate. The colour of the painting will retain it.
- Question 12 of 50
12. Question
Milk is a natural:
Hint
Milk is a natural emulsion in which milk fat is dispersed in water. Emulsion is any mixture of liquids that do not normally mix together, such as oil and water.
- Question 13 of 50
13. Question
A polymeric substance used to make parachute is:
Hint
A parachute is usually made of a light, strong fabric. Terylene - A type of polyester fabric that is now being used as a material for parachutes as it is very strong and heat resistant.
- Question 14 of 50
14. Question
Drinking soda is:
Hint
Soda water is a carbonated drink where CO2 is dissolved in water to form carbonic acid, hence it is acidic in nature.
- Question 15 of 50
15. Question
The cathode of a lead storage battery is made up of:
Hint
In a lead-acid battery, the cathode is made of lead dioxide, and the anode is made of metallic lead. The two electrodes are separated by an electrolyte of sulfuric acid.
- Question 16 of 50
16. Question
Which one of the following is radioactive?
Hint
The four common radioactive elements are Uranium, Radium, Polonium, Thorium, etc. Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability. The emission of radiation transforms radioactive atoms into another chemical element, which may be stable or maybe radioactive such that it undergoes further decay.
- Question 17 of 50
17. Question
The acid used in lead storage cells is:
Hint
In a lead-acid battery, the cathode is made of lead dioxide, and the anode is made of metallic lead. The two electrodes are separated by an electrolyte of sulfuric acid. Here, lead dioxide, lead metal, and sulfuric acid react to form lead sulfate and water; the separate processes are the oxidation of lead to lead sulfate at one electrode and the reduction of lead dioxide to lead sulfate at the other while the electric charge is transported through the electrolyte by the migration of hydrogen ions.
- Question 18 of 50
18. Question
Alum stops bleeding in minor cuts because of:
Hint
Alum stops bleeding in minor cuts because of coagulation. When alum is added to water, it reacts with the water and results in positively charged ions (Al3+). On applying alum on fresh minor cuts, coagulation of negatively charged particles with Al3+ ions takes place and bleeding stops.
- Question 19 of 50
19. Question
Tincture iodine is a solution of iodine in:
Hint
Tincture of iodine (weak iodine solution) is an antiseptic. It is usually 2 to 7 percent elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol (Ethyl Alcohol) and water. Tincture solutions are characterized by the presence of alcohol.
- Question 20 of 50
20. Question
Plaster of Paris is made by partial dehydration of:
Hint
Plaster of Paris ((CaSO4) H2O) is made by partial dehydration of gypsum salt. Plaster of Paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180°C. With an additive to retard the set, it is called wall, or hard wall, plaster, which can provide passive fire protection for interior surfaces.
- Question 21 of 50
21. Question
Water can lie separated from alcohol-water mixture by:
Hint
Water can lie separated from alcohol-water mixture by fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points. Since ethanol boils at a lower temperature (78.5°C) than water, the alcohol vaporizes while most of the water remains a liquid.
- Question 22 of 50
22. Question
Petroleum is a mixture of:
Hint
Petroleum is mainly a mixture of hydrocarbons, i.e. containing only carbon and hydrogen. The most common components are alkanes (paraffins), cycloalkanes (naphthenes), and aromatic hydrocarbons.
- Question 23 of 50
23. Question
The gas used for filling weather balloons is:
Hint
The gas used for filling weather balloons is helium. Hydrogen is lighter than air and can be used in filling air balloons but due to its highly inflammable nature, it is not used in air balloons.
- Question 24 of 50
24. Question
Hydrogen is not found in atmosphere because:
Hint
The reason there is not much hydrogen in the atmosphere is because it is lighter than air, and so can easily escape the Earth’s gravity.
- Question 25 of 50
25. Question
Who discovered the atom bomb?
Hint
The atom bomb is discovered by German chemist Otto Hahn. He is referred to as the father of nuclear chemistry and godfather of nuclear fission. Hahn and Lise Meitner discovered radioactive isotopes of radium, thorium, protactinium and uranium.
- Question 26 of 50
26. Question
What is the most commonly used substance in fluorescent tubes?
Hint
Mercury vapour and argon is the most commonly used substance in fluorescent tubes. A tube is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. Argon gas is used in fluorescent tubes to stop the oxygen from corroding the hot tungsten filament.
- Question 27 of 50
27. Question
What is “milk of magnesia” chemically?
Hint
Milk of magnesia is also known as magnesium hydroxide. It is an inorganic compound with the chemical formula Mg(OH)2. It occurs in nature as the mineral brucite.
- Question 28 of 50
28. Question
Soap is prepared by boiling caustic soda with:
Hint
Soap is prepared by boiling caustic soda with Fats. Soap is prepared by hydrolyzing fat under alkaline (basic) conditions. The reaction is called saponification, and produces one molecule of glycerin and three molecules of soap, for each molecule of fat taken.
- Question 29 of 50
29. Question
Which one of the following metals is used to galvanise iron?
Hint
Zinc is used to galvanise iron. Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.
- Question 30 of 50
30. Question
Bronze is an alloy of:
Hint
Bronze is an alloy traditionally composed of copper and tin. Bronze is typically consists of approximately 88 percent copper and 12 percent tin.
- Question 31 of 50
31. Question
The natural source of hydrocarbon is:
Hint
The natural source of hydrocarbon is Crude oil. A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Crude oil is a mixture of hydrocarbons that exists as a liquid in underground geologic formations.
- Question 32 of 50
32. Question
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)?
Hint
Liquefied petroleum gas (LPG) is a by-product of the refinery process. It is a fuel gas made of petrol which contains a flammable mixture of hydrocarbon gases, most commonly propane (C3H8), butane (C4H10) and propylene. The composition of LPG from its individual components is not fixed.
- Question 33 of 50
33. Question
An element which does not react with oxygen is:
Hint
An element which does not react with oxygen is Helium. The noble metals or inert gas do not react with oxygen. Helium (He), argon (Ar), neon (Ne), krypton (Kr), xenon (Xe), and radon (Rn), etc. are common inert gases.
- Question 34 of 50
34. Question
The chemical used for destroying Fungi in water tanks is:
Hint
Copper sulphate (CuSO4) is used for destroying Fungi in water tanks. It can kill bacteria, algae, roots, plants, snails and fungi.
- Question 35 of 50
35. Question
Which among the following metals provides amphoteric oxide?
Hint
Aluminium provides amphoteric oxide. Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides. Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Al2O3 is an example of an amphoteric oxide.
- Question 36 of 50
36. Question
Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid?
Hint
The indicator used in the titration of sodium carbonate with sulphuric acid is Methyl orange. Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values. Methyl orange shows red color in the acidic medium and yellow color in the basic medium.
- Question 37 of 50
37. Question
Which among the following is pure matter?
Hint
Matter is any substance that has mass and takes up space by having volume. Pure matter can be either Elements or Compounds. Carbon dioxide is a pure matter. Examples of pure matter include carbon, oxygen, iron, table salt and water. Air is a homogeneous mixture. Brass and Steel are alloys, therefore it is a mixture.
- Question 38 of 50
38. Question
Bauxite is an ore of which of the following metals?
Hint
Bauxite is the principal ore of aluminum. It is generally a mixture of hydrous aluminum hydroxides (gibbsite, boehmite, and diaspore), clay minerals, and insoluble materials such as quartz, hematite, magnetite, siderite, and goethite.
- Question 39 of 50
39. Question
Nucleus of an atom consists of:
Hint
Nucleus of an atom consists of protons and neutrons. The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron’s negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge.
- Question 40 of 50
40. Question
Galvanised iron is made by coating iron with:
Hint
Galvanized iron is essentially iron that’s been coated with a protective zinc layer on the outside, to prevent rusting. The process of applying a protective zinc coating to steel or iron is called Galvanization.
- Question 41 of 50
41. Question
The advantage of detergents over soaps is:
Hint
Detergents are better cleansing agents than soaps because they can be used even with hard water. Detergents contain ammonium or sulphonate salts of long-chain carboxylic acids, they are better than soaps. With calcium and magnesium present in hard water, the charged ends of these will not precipitate. Soaps, on the other hand, will precipitate with the calcium and magnesium ions in hard water.
- Question 42 of 50
42. Question
The fundamental particles present in the nucleus of an atom are:
Hint
Nucleus of an atom consists of protons and neutrons. The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron’s negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge.
- Question 43 of 50
43. Question
Bleaching action of moist sulphur dioxide is because of its:
Hint
The bleaching of Sulphur dioxide (SO2) is mainly due to its reduction property and its temporary reaction as soon as it gains the required oxygen helps to regenerate its initial property.
- Question 44 of 50
44. Question
The long-range potential of nuclear energy in India depends on its reserves of:
Hint
The long-range potential of nuclear energy in India depends on its reserves of uranium. As of November 2020, 22 reactors – 7382 MWe (gross) – of nuclear capacity were fuelled by indigenous uranium and being operated close to their rated capacity.
- Question 45 of 50
45. Question
Which of the following gases will effuse out of football bladder most quickly?
Hint
H2 will effuse out of the football bladder most quickly. The rate of effusion for a gas is inversely proportional to the square root of its molecular mass (Graham’s Law). The gas with the lowest molecular weight will effuse the fastest. here H2 is The lightest, hence it effuses fastest.
- Question 46 of 50
46. Question
Which of the following alkali metals has the highest specific heat?
Hint
Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C). Lithium has the highest specific heat capacity of any solid element.
- Question 47 of 50
47. Question
In which of the following substances all carbon atoms are quaternary in nature?
Hint
In diamonds, all carbon atoms are quaternary in nature. A quaternary carbon is a carbon atom bound to four other carbon atoms. Diamond has a giant covalent structure in which each carbon atom is bound to four other carbon atoms by covalent bonds.
- Question 48 of 50
48. Question
Which of the following is natural dye?
Hint
Alizarin (C14H8O4) is a natural dye. It is a red dye originally obtained from the root of the common madder plant, Rubia tinctorum, in which it occurs combined with the sugars xylose and glucose. In 1869, it became the first natural dye to be produced synthetically.
- Question 49 of 50
49. Question
Global warming is mainly due to accumulation of:
Hint
Global warming occurs when carbon dioxide (CO2) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. The burning of fossil fuels, deforestation and farming are major causes of global warming.
- Question 50 of 50
50. Question
Which is abundant in Gobar gas?
Hint
Gobar gas (Biogas) is primarily methane (CH4) with some carbon dioxide, carbon monoxide and traces of other gases. Methane consists of carbon and hydrogen. The chemical symbol is.