Chemistry Multiple choice questions(50) with answer

ppt on Chemistry Multiple choice questions(50) with answer

1. Multiple choice questions

2. Q 1 Who is regarded as father of modern chemistry ? Ruterford Einstein Lavoisier C.V Raman Answer: Lavoisier

3. Q2. Identify the wrong statement in the following? Atomic radius of the elements increases as one moves down the first group of the periodic table Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Amongst isoelectronic species, smaller the positive charge on the cation , smaller is the ionic radius Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius Answer: Amongst isoelectronic species, smaller the positive charge on the cation , smaller is the ionic radius

4. Q3. The term PVC used in the plastic industry stands for Polyvinyl chloride Polyvinyl carbonate Phosphor vanadiu chloride Phosphavinyl chloride Answer: Polyvinyl chloride

5. Q4. The number of moles of solute present in 1 kg of a solvent is called its Molality Molarity Normality Formality Answer: Molality

6. Q5. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called Granite Basalt Igneous rocks Sedimentary rocks Answer: Igneous rock

7. Q6. The octane number of zero is assigned to 2- methyl octane N- heptane Iso - octane 3- methyl octane Answer: n-heptane

8. Q7. Which is used in preparation of dynamite ? Glycerol Ethyl alochol Methyl alcohol Glycol Answer: Glycerol

9. Q8. Bleaching action of chlorine is by Decomposition Gydrolysis Reduction Oxidation Answer: Decomposition

10. Q9. What is a mixture of potassium nitrate powdered charcoal and sulphur called? Paint Aluminium Brass Gun powder Answer: Gun powder

11. Q10. Nail polish remover contains ? Benzene Acetic acid Acetone Petroleum ether Answer: Acetone

12. Q11. The isotope atoms differ in ? Number of protons Atomic number Number of electrons Atomic weight Answer: number of electrons

13. Q12. Natural rubber is polymer derived from ? Ethylene Propylene Isoprene Butadiene Answer: isoprene

14. Q13. Which is also called Stranger Gas ? Xenon Neon Argon Nitrous oxide Answer: Xenon

15. Q14. The chemical used as a fixer in photography is ? Sodium thio sulphate Sodium sulphate Borax Ammonium sulphate Answer: sodium thio sulphate

16. Q15. Water drops are spherical because of ? Viscosity Density Polarity Surface tension Answer: surface tension

17. Q16. he oxide of Nitrogen used in medicine as anaesthetic is ? Nitrogen pentoxide Nitrous oxide Nitric oxide Nitrogen dioxide Answer: nitrogen pentoxide

18. Q17. Which one of the following metals does not react with water to produce Hydrogen? Cadmium Lithium Potassium Sodium Answer: cadmium

19. Q18. The most electronegative element among the following is Sodium Bromine Fluorine Oxygen Answer: fluorine

20. Q19. The metal used to recover copper from a solution of copper sulphate is ? Na Ag Hg Fe Answer: Fe

21. Q20 The metallurgical process in which a metal is obtained in a fused state is called ? Roasting Calcinations Smelting Froth floatation Answer: smelting

22. Q21. Which of the following is produced during the formation of photochemical smog ? Nitrogen oxides Hydrocarbons Methane Ozone Answer: ozone

23. Q22. Which of the following gas is used in cigarette lighters ? Butane Propane Methane Ethane Answer: butane

24. Q23.  Iodine can be separated from a mixture of Iodine and Potassium Chloride by ? Filtration Sublimation Distillation Sedimentation Answer: sublimation

25. Q24 . The material which can be deformed permanently by heat and pressure is called a Thermoset Thermoplastic chemical compound Polymer Answer: thermoset

26. Q25. . Conduction band electrons have more mobility than holes because they are experience collision more frequently experience collision less frequently have negative charge need less energy to move them Answer: experience collision less frequently

27. Q26. The gas used for artificial ripening of green fruit is ? Ethane Ethylene carbon dioxide Acetylene Answer: ethylene

28. Q27. The main chemical constituent of clay is ? aluminium silicate Zeolites aluminium borosilicate silicon oxide Answer: aluminium silicate

29. Q28. What is hottest part of the gas flame is called ? blue zone luminous zone dark zone non-luminous zone Answer: non-luminous zone

30. Q29. Permanent hardness of water is due to the presence of ? Magnesium bicarbonate Calcium bicarbonate Sodium bicarbonate Calcium sulphate Answer: Calcium sulphate

31. Q30. Sugars are converted in the liver into Glycogen Vitamin Monosaccharide None of above Answer: glycogen

32. Q31. The ejection of electrons when a metal surface is irradiated is known as Black body radiation Photoelectric effect Zeeman effect Atomic spectrum Answer: photoelectric effect

33. Q32. Which of the following gases is the most toxic? Carbon dioxide Sulphur dioxide Carbon monoxide Acetic acid Answer: carbon monoxide

34. Q33. Which of the following elements behave chemically both as a metal and a non metal ? Boron Carbon Argon Mercury Answer: boron

35. Q34. Why is phosphorus kept under water ? to make it wet to make it durable water forms a protective coating on it to save it from catching fire when exposed to dry air Answer : to save it from catching fire when exposed to dry air

36. Q35. What is extracted from Bauxite ? Mica Aluminium Copper Tin Answer: aluminium

37. Q36. Brass is an alloy of ? Copper and Tin Copper and Zinc Copper and Aluminium Iron and Copper Answer: copper and zinc

38. Q37. Contact lenses are made from ? Polyvinyl chloride Teflon Polystyrene Lucite Answer : Polyvinyl chloride

39. Q38. The single acid which dissolves gold is ? Aqua regia Hydrochloric acid Nitric acid Selenic acid Answer: aqua regia

40. Q40. How many different oxides are formed by nitrogen ? Two Three Four Five Answer: two

41. Q41. The major component used in preparation of different types of glasses is : Sodium borate Sodium silicate Silica Calcium silicate Answer: silica

42. Q42. What is metallurgy ? process of extracting metal in pure form from its ore . process of creating alloys of metals . process of making metals live long . None of above . Answer : process of extracting metal in pure form from its ore

43. Q42. Which have maximum number of isotopes ? Bromine Aluminium Polonium Carbon Answer: polonium

44. Q43. Which prefix is often used with scientific terms to indicate that something is the same, equal or constant Iso Mega Meta Quasi Answer: iso

45. Q44. Superconductivity is a material property associated with cooling a substance without a phase change frictionless liquid flow a loss of thermal resistance a loss of electrical resistance Answer: a loss of electrical resistance

46. Q45. Which of the following is primarily composed of calcium carbonate? Fish scales Shark teeth Oyster Shells Whale bones Answer: oyster shells

47. Q46. Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid Increases Decreases Stays the same None of the above Answer: increases

48. Q47. Vacuoles are bound by a definite membrane in plant cells called Plasma membrane Tonoplast Cell wall None of the above Answer: Tonoplast

49. Q48. The wonder pigment chlorophyll is present in Mitochondria Centrosomes Quantosomes Lysosomes Answer: Quantosomes

50. Q49 . The concept of carbon credit originated from which one of the following ? Earth Summit, Rio de Janeiro Kyoto Protocol Montreal Protocol G-8 Summit, Hciligendamm Answer: Kyoto protocol

51. Q50. Select the one which is not a mixture Air Gasoline LPG Distilled water Answer: distilled water

52. Efforts by vibhor agarwal