Chemistry Subject 2019 PPSC Test With Full Book Download in PDF

INTRODUCTION TO CHEMISTRY

1. The atoms of an element whic have s me atomic number but different atomic masses are called:

(a) Mole (b) Molecule
(b) Isotopes (d) A vagadro

2. determined atomic masses of elements for the first time:

(a) J. Berzelius (b) J.J. Thomson
(c) John Dalton (d) Democntus

3. One mole of Sl2 contain oxygen atom:

(a) 6.02 x 1023 (b) 12.04 x1Q23
(c) 1 mole (d) 3 mole

4. Formula mass of Mg So. is g/mole:

(a) 150 (b) 120
(c) 130 (d) 140

5. CNG stands for:

(A) Compound Natural Gas
(B) Complete Natural Gas
(C) Compressed-Natural Gas
(D) None of these

6. Which of the following compound has the highest % age of oxygen by weight

(a) CH3- OH (b) C2Hs- OH
(c) HCO OH (d) H20

7. Energy is released during a reaction is called:

(a) Exothermic reaction
(b) Endothermic reaction
(c) A free radical reaction
(d) A bond breaking reaction

8. Cr2 Or2 is called:

(a) Double salt (b) A complex salt
(c) A complex anion (d) A carbonation

9. X-ray work has shown that the diameter of atoms are of the order of

(a) 8x1G-‘ m (b) 2xH)·’Om
(c) 8x1G-‘m (d) 2×1 m

10. Relative atomic mass of an element is the mass of an element relative to:

(a) mass of carbon
(b) 1/12 mass of carbon
(c) 1mass of hydrogen atom
(d) 1/16 mass of oxygen

11. At room temperature bromine is:

(a) pale yellow gas
(b) greenish yellow gas
(c) red-brown liquid
(d) shiny grayish black solid

12. At room temperature iodine is

(a) pale yellow gas
(b) greenish yellow gas
(c) red-brown liquid
(d) shiny grayish black solid

13. A molecule of hemoglobin have atoms nearly:

(a) 10000 atoms (b) 50000 atoms
(c) 21500 atoms (d) 11500 atoms

14. The molecular mass of hemoglobin is greater than to mass of one hydrogen is:-

(a) 60000 (b) 55000
(c) 67000 (d) 68000

15. The relationship between reactants and production an equation is called

(a) Stoichiometry (b) Reversibility
(c) Umiting reagent (d) All of the above

16. The number of males or C02 which contain 8.0 9 of oxygen:

(a) 0.25 (b) 0.5
(c) 1.0 (d) 150

17. The percentage of which element in the organic compound is determined by the difference method.

(a) Carbon (b) Hydrogen
(c) Cholorine (d) Oxygen

18. largest number of molecules are present in:

(a) 3.6 g of H2 0 (b) 4.8 g of Hs OH

19. Ctr1 + S used in Microsoft word is to

(A) Save a document
(B) Delete the Document
(C) Add the Document
(D) None of these

20. crn3 of Cugas at S.T.P. has molecules:

(a) 6.02 x 021 (b) 1.003x 1023

21. 4.6 grams of C2 Hs OH and 6 grams of C2 H6 have:

(a) Equal number of molecules

(b) C2Hs OH has greater number of molecules

(d) C2Hs has less mass of carbon

22. A beaker contains 9 grams of water calculate. The number of H-atoms :

(a) 6.02 X 1023 (b) 3.01 X 1023

23. Which of the following compounds contains the hilhest percentage by mass of nitrogen?

(a) ammonia, NH2

(b) ammonium carbonate,NH2 C02 NH•

(d) hydrazine, N2 H•

24. Which one of the following compounds does not have the empirical formula CH2 0?

(a) ethanoic acid, CHJ C02 H

(b) ethanol,CHJ CH2 OH

(d) methanol, HCHO

25. How many moles of hydrogen atoms 3.2 g of methane,CH• contain?

(a) 0.02 (b) 0.2

26. A balloon contains 0.02 gram of H2 gas, it contains H2 molecules

(a) 6.02 X 1()23 (b) 3.61X 1024

27. One mole of C2 Hs OH contains the number of H-atoms:

(a) 6.02 X 1023 (b) 3.61 X 1()24

28. When 0 1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced?

(a) 10 cm3 (b) 50 cm3

29. When one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?

(a) carbon oxide (b) diamond

30. Glycol is added to aviation gasoline because it

(a) prevents freezing of petrol

(b) reduces consumption of petrol

(d) increase efficiency of petrol

31. Which of the following solution is used in photography?

(a) Sodium thiosulfate

(b) Sodium silver

(d) Silver salt

32. Which one of the follow1ng is used as a moderator in a nuclear reactor?

(a) Radium (b) Ordinary water

33. Which of the following hemicals 1s used for fruit ripening?

(a) Calctum carbide (b) Sodium chloride

34. Which one or the following is an air pollutant gas and is released by burning of fossil fuel?

(a) Nitrogen (b) Hydrogen

35. Who is credited with the discovery of nylon?

(a) Frederick Banting (b) Jonas Salk

36. What is the mam constituent of a Pear1?

(a) Calcium carbonate only

(b) Calcium sulphate only

(d) Calcium carbonate and magnesium carbonate

37. Contact lenses are made from

(a) Polyvinyl chloride (b) Teflon

38. origin of lines in H2 spectrum all of these In the ground state of an atom, the electron is

present:

(a) in the nucleus in the second shell

(b) Stark effect
(c) nearest to the nucleus

(d) farthest from the nucleus

39. When 3p orbital is complete, the entering electron goes into:

(a) 4s (b) 3d

40. In order to determine the position of electron the radiation used 1s:

(a) visible hght

(b) infrared radiations

(d) ultraVIolet radiabons

41. The relation llx. 6p = h/2r is called uncertainty principle the value of A:t. sigmfies:

(a) change in momentum

(b) change in position

(d) waveten9 th of visible light

42. (Diammonium hydrogen phosphate) contains plant nutrients.

60% (b) 65%
70% (d) 75%

43. each of the potassium friizers are more useful for horticultural crops tobacco & potatoes?

(a) KCI (b) KN03
(c) KzSO. (d) KMno.

44. lch one of the following statement is correct for urea?

(a) it Is a synthetic fertilizer
(b) it Is a natural fertilizer
(c) it rovides micronutrients to the plants
(d) It ts an inorganic water soluble compound

45. percentage of nitrogen in urea is

(a) 36% (b) 46%
(c) 56% (d) 66%

46. cement is a mixture of

(a) clay and clinker
(b) clay lime stone and gypsum
(c) lime stone and gypsum
(d) lime stone and clay

47. What is clinker?

(a) roasted calcareous material
(b) roasted argillaceous material
(c) roasted calcareous and argillaceous material
(d) roasted gypsum

48. Which one of the following set of raw material is most suitable for manufacture of ureal

(a) CH• N2 and Ch
(b) H2 N2 and CO
(c) Hz COz and H20
(d) H20 Nz and Hz

49. The film forming components of paints are

(a) Resins (b) Thinners
(c) Pigments (d) Driers

50. Ceramics Industry deals with the production of
(a) Cement (b) Glass
(c) Paper (d) Pottery

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