JEXPO and VOCLET Chemistry Model Set 3

JEXPO and VOCLET Chemistry Model Set 3

‘Chemistry’ is the branch of science involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. It is one of the fundamental branches of science that arrangements with the properties, structure, and constituents of issue or substances and its communications with different types of issue. There is a great deal of contrast that can be seen when you think about Basic Chemistry and Modern science. Fundamental Chemistry began in antiquated circumstances because of popular researchers called Alchemists. It clarified every one of the essentials of the subject which were closed after a progression of examinations which shed light on how they truly functioned. Though Modern Chemistry won in the seventeenth century which laid orderly strides in picking up information about the issue. Present day science realized different hypotheses which at last ended up defended with the investigations they led to demonstrate how matter cooperates.

The space of Chemistry involves the investigation of the piece of the issue, its structure, and properties. The principal constituents of issue, iotas, and particles, shape the premise of science. Science has given responses to different inquiries. The quantitative estimation of the constituents of essential constituents of issue i.e. iotas and atoms and their reliance on the mass of the given issue is all around clarified by science. Advances in science have helped researchers and designers to bridle the vitality related with these iotas and atoms.

Today we can protect nourishment things for long term’s of time; we have a huge number of chemicals that are being utilized as a part of various enterprises for assembling an assortment of items. Phone covers, plastic sacks, the steel utilized as a part of development, the sanitized drain, photosynthesis, the saltines we consume, and so forth are just a couple of cases of results of science. These items are such profoundly established in our lives that we neglect to envision their significance and the part of the science behind them.

1.Q.) Gunpowder consists of a mixture of –

a) TNT and charcoal

b) Sulphur, sand, charcoal

c) Sand and charcoal

c) Nitre, Sulphur, and charcoal

2.Q.) Find out the percentage of oxygen in H₂SO₄ –

a) 6.351

b) 65.31

c) 63.51

d) 635.1

3.Q) The smallest possible unit of a chemical compound is –

a) Electron

b) Molecule

c) Proton

d) Atom

4.Q) Paracetamol –

a) is a sulphadrug

b) is an antibiotic

c) relieves body pain

d) causes stomach ulcers

5.Q) Tetraethyl lead (TEL) is added to petrol to –

a) Increase anti-knocking rating

b) Increase flash point

c) Prevent freezing

d) Increase boiling point

6.Q) The chemical reaction that takes place with the evolution of heat is called a/an –

a) Thermal reaction

b) Exothermic reaction

c) Reversible reaction

d) Endothermic reaction

7.Q) The boiling point of water on the Kelvin scale of temperature is –

a) 273

b) 373

c) 212

d) 100

8.Q) The commonly used medicine for Typhoid is –

a) Chloromycetin

b) Ascorbic acid

c) Sulpha drug

d) Chloroquine

9.Q) Formalin is a solution of –

a) Furfural

b) Fluorescein

c) Formic acid

d) Formaldehyde

10.Q) 1 micron is equivalent to –

a) 0.0001 m

b) 0.01 mm

c) 0.001 mm

d) 0.01 m

11.Q) Absolute alcohol is –

a) 95% alcohol and 5% water

b) 100% of proof

c) 200% of proof

d) Rectified spirit

12.Q) Turpentine oil is obtained from the wood of –

a) Pinus

b) Micas

c) Cedrus

d) Gnetum

13.Q) The drug reserpine is used to –

a) Cure arthritis

b) Alleviate pain

c) Reduce high palpitation

d) Reduce high blood pressure

14.Q) The Central Drug Research Institute (CDRI) is located in –

a) Lucknow

b) Delhi

c) Bangalore

d) Allahabad

15.Q) The nature of saliva is –

a) Basic

b) Amphoteric

c) Acidic

d) Neutral

16.Q) Of the following commonly used materials the one that is not an alloy is –

a) Brass

b) Copper

c) Bronze

d) Steel

17.Q) The volume of a definite mass of a gas at 0°C and 76 cm pressure in 250 cc. At the same pressure, what will be the volume of gas at 273°C?

a) 1500 cc

b) 250 cc

c) 50 cc

d) 500 cc

18.Q) While cooking food, the compounds lost to the maximum extent are –

a) Carbohydrates

b) Fats

c) Proteins

d) Vitamins

19.Q) A mixture of two or more metals is called by the general name –

a) Alkali metal

b) Noble metal

c) Amalgam

d) Alloy

20.Q) The substance that is least prone to catch and spread fire is –

a) Polyester

b) Cotton

c) Terrycot

d) Nylon

21.Q) Emeralds are made up of –

a) Gold

b) Silica

c) Beryllium

d) Carbon

22.Q) The use of Gypsum is recommended mainly in soils which are –

a) Acidic

b) Saline

c) Waterlogged

d) Alkaline

23.Q) For instant energy, athletes text –

a) Glucose

b) Vitamin C

c) Sucrose

d) Sodium

24.Q) All acids essentially contain the element –

a) Oxygen

b) Hydrogen

c) Chlorine

d) Sulphur

25.Q) The gas used for inflating balloons is –

a) Air

b) Hydrogen

c) Helium

c) Nitrogen

26.Q) Nitrogen in air –

a) Decreases the density of air

b) Is essential for the body

c) Makes oxygen soluble in blood

d) Dilute oxygen which otherwise is very active in the pure form.

27.Q) Natural rubber is polymer of –

a) Styrene

b) Isoprene

c) Ethylene

d) Vinyl

28.Q) The element which forms the largest number of compounds with hydrogen is –

a) Boron

b) Silicon

c) Oxygen

d) Carbon

29.Q) An acid that can be used as a hypnotic is –

a) Butanoic acid

b) Benzoic acid

c) Tartaric acid

d) Barbituric acid

30.Q) Camphor can easily be purified by the process of –

a) Distillation

b) Sublimation

c) Crystallization

d) Sedimentation

31.Q) The most malleable metal is –

a) Iron

b) Silver

c) Gold

d) Platinum

32.Q) In hospitals or oxygen tubes for respiration contains Oxygen and –

a) Helium

b) Carbon dioxide

c) Argon

d) Nitrogen

33.Q) The number of molecules in 4.4 gram of carbon dioxide gas is –

a) 6.023 × 10²³

b) 6.032 × 10²²

c) 6.023 × 10²²

d) 6.023 × 10²³

34.Q) Pure water can be obtained from seawater by the process of –

a) Filtration

b) Evaporation

c) Distillation

d) Factional distillation

35.Q) Common salt is –

a) Sodium chloride

b) Calcium chloride

c) Sodium Bicarbonate

d) Magnesium Bicarbonate

36.Q) The most abundant gas in the atmosphere is –

a) Nitrogen

b) Helium

c) Oxygen

d) Carbon dioxide

37.Q) The acid used in batteries is –

a) Sulfuric acid

b) Acetic acid

c) Nitric acid

d) Hydrochloric acid

38.Q) A gas which is not present in normal samples of air is –

a) Neon

b) Chlorine

c) Carbon dioxide

d) Helium

39.Q) How much CaCO₃ will be required to produce 66 gm CO₂? What will be the volume of CO₂ at N.T.P.?

a) 175 gms, 3.36 litres

b) 150 gms, 33.6 litres

c) 175 gms, 33.6 litres

d) 150 gms, 3.36 litres

40.Q) Chemically dry ice is –

a) ice kept at sub-zero temperature

b) Ice formed from pure distilled water

c) Solid carbon dioxide

d) Solid Sulphur dioxide

41.Q) The acid present in lemon and oranges is –

a) Oxalic acid

b) Citric acid

c) Acetic acid

d) Hydrochloric acid

42.Q) Of the following, the content of carbon is minimum in –

a) Wrought iron

b) Cast iron

c) Pig iron

d) Steel

43.Q) The main chemical substance present in the bones and teeth of animals –

a) Sugar

b) Sodium chloride

c) Calcium sulphate

d) Calcium phosphate

44.Q) Marsh gas formed from decaying organic matter and coal mines, is –

a) Ethane

b) Carbon monoxide

c) Carbon dioxide

d) Methane

45.Q) The compound that does not form a clear solution with cold water is –

a) Sugar

b) Caustic soda

c) Baking powder

d) Benzoic acid

46.Q) The atomic number of an element is equal to the –

a) Number of electrons in its outermost orbit

b) Number of neutrons in its nucleus

c) Number of protons in its nucleus

d) Relative atomic mass

47.Q) Pure alcohol can be easily obtained from wine by the process of –

a) Oxidation

b) Cracking

c) Distillation

d) None

48.Q) The gas that can be used as a domestic fuel is –

a) Nitrogen

b) Hydrogen

c) Methane

d) Oxygen

49.Q) The element not present in fertilizers is –

a) Nitrogen

b) Hydrogen

c) Phosphorus

d) Chlorine

50.Q) The two gases used in the industrial preparation of sulphuric acid are –

a) Sulphur dioxide and chlorine

b) Sulphur dioxide and oxygen

c) Carbon dioxide and oxygen

d) Sulphur dioxide and hydrogen