Fundamentals of Chemistry – MCQ’s

(a) Qualitative analysis ✓

(b) Clinical analysis

(c) Quantitative analysis

(d) Chemical analysis

3. Which one of the followings is applicable in chemical industry like metallurgy, ceramics and glass?

(a) Organic chemistry

(b) Inorganic chemistry ✓

(c) Industrial chemistry

(d) Nuclear chemistry

4. Anything that has mass and occupies space is called:

(a) Substance

(b) Matter ✓

(c) Element

(d) Atomic mass

5. The number of elements known in early ages is:

(a) 118

(b) 109

(c) 63

(d) 9 ✓

6. Until the end of 19^th century how many elements were discovered?

(a) 9

(b) 63 ✓

(c) 92

(d) 118

7. The percentage of aluminum in crust of earth is:

(a) 47%

(b) 28% ✓

(c) 7.8%

(d) 1.8%

8. Which one of the following elements is liquid at room temperature?

(a) Bromine

(b) Mercury

(c) Nitrogen

(d) Both a & b ✓

9. Piece of matter in pure form is called:

(a) Mixture

(b) Matter

(c) Substance ✓

(d) Compound

10. The quantity of potassium, magnesium, sulphur and sodium in human body is:

(a) 0.2%

(b) 0.6%

(c) 0.8% ✓

(d) 0.4%

11. The unique property of an element is called:

(a) Electronegativity

(b) Valency ✓

(c) Mobility

(d) Oxidation number

12. In water fixed ratio of hydrogen and oxygen by mass is:

(a) 8:1

(b) 2:16

(c) 1:8 ✓

(d) 2:1

13. The mixture which has uniform composition throughout is called:

(a) Simple mixture

(b) homogeneous mixture ✓

(c) Heterogeneous mixture

(d) Compound mixture

14. Which one of the followings is the mixture of oxygen, nitrogen and carbon dioxide?

(a) Soil

(b) Water

(c) Air ✓

(d) Brass

15. The sum of protons and neutrons in the nucleus of an atom is called:

(a) Atomic number

(b) Mass number ✓

(c) Formula mass

(d) Atomic mass unit

16. A substance whose atoms have the same atomic number is called:

(a) Element ✓

(b) Substance

(c) Mixture

(d) Compound

17. H₂O is an example of:

(a) Radical cation

(b) Radical anion

(c) Compound ✓

(d) Element

18. One mole of any material contains chemical units equal to:

(a) 6.02×10²³ ✓

(b) 6.02×10²⁴

(c) 6.02×10^-24

(d) 6.02×10²⁵

19. Ion, molecular ions, free radicals and neutral molecules are called:

(a) Ionic species

(b) Molecular species

(c) Chemical species ✓

(d) Atomic species

20. Noble gases are the best examples of:

(a) Mono atomic molecules ✓

(b) Hetero atomic molecules

(c) Poly atomic molecules

(d) Diatomic molecules

21. Brass is the mixture of:

(a) Cu+Zn ✓

(b) Cu+Pb

(c) Zn+Pb

(d) Sn+Cu

22. The molar mass of H₃PO₄  is:

(a) 58.5g

(b) 98g ✓

(c) 40g

(d) 98amu

23. The number of particles in one mole of a substance is called:

(a) Atomic number

(b) Particle number

(c) Avogadro^’s number ✓

(d) Mass number

24. 1amu (atomic mass unit) is equivalent to:

(a) 1.66×10²³g

(b) 1.66×10^-24g ✓

(c) 1.66×10^-23g

(d) 6.02×10^-25

25. The sum of atomic masses of all the atoms in one formula unit of a substance is called:

(a) Atomic mass

(b) Mass number

(c) Formula mass ✓

(d) Atomic mass unit

26. Which one of the followings shows the simplest whole number ratio of atoms in a substance?

(a) Molecular formula

(b) Empirical formula ✓

(c) Chemical formula

(d) Covalent formula

27. Chemical formula of washing soda is:

(a) Na₂CO₃.H₂O

(b) Na₂CO₃.10H₂O ✓

(c) Na₂CO₃.7H₂O

(d) Na₂CO₃

28. Mass of an electron is:

(a) 5.486×10^-4amu ✓

(b) 9.106×10^-28amu

(c) 1.672×10^-24 g

(d) 1.677×10^-24 g

29. Which one of the followings is a reactive species?

(a) Molecule

(b) Molecular ion ✓

(c) Compound

(d) Formula unit

30. An atom or group of atoms having odd number of electrons is called:

(a) Radical

(b) Ion

(c) Free radical ✓

(d) Molecular ion

31. Which one of the followings is tri atomic molecule?

(a) H₂SO₄

(b) N₂

(c) CO₂✓

(d) HCl

32. The formula mass of an ionic compound expressed in grams is called

(a) Gram formula mass

(b) Gram formula

(c) Mole

(d) All of these ✓

33. The total number of ions in one mole of NaCl is:

(a) 12.04×10²³ ions ✓

(b) 1.204×10²³ ions

(c) 6.04×10²³ ions

(d) 61.04×10²³ ions

34. Number of moles×6.02×10²³ is equal to:

(a) Number of moles

(b) Number of particles ✓

(c) Mass of substance

(d) Mass of particles

35. The symbol for nitride radical is:

(a)      CO²₃

(b)   N^3-✓

(c)   PO^3-₄

(d)   S₂O^2-₃

36. It is a liquid element at room temperature

(a) Mercury ✓

(b) Nickel

(c) Hydrogen

(d) Iodine

37. Mass of proton is equivalent to: 

(a) 1.672×10^-24amu

(b) 16.72×10^-24g

(c) 1.672×10²⁴g

(d) 1.672×10^-24g ✓

38. The number of neutrons in ₉₂U²³⁸ is: 

(a) 194

(b) 92

(c) 146 ✓

(d) 238

39. An atom or group of atoms having positive charge on it is called:

(a) Cation ✓

(b) Anion

(c) Molecule

(d) Atom

40. Which of the followings shows variable valency?

(a) Ca

(b) Fe ✓

(c) B

(d) I

41. Which one of the following elements is found most abundantly in the earth crust?

(a) Oxygen ✓

(b) Aluminium

(c) Silicon

(d) Iron

42. The third abundant gas found in the atmosphere is:

(a) Carbon monoxide

(b) Oxygen

(c) Nitrogen

(d) Argon ✓

43. Total number of elements which have been discovered till now are:

(a) 110

(b) 115

(c) 118 ✓

(d) 102

44. Which element is found in liquid state?

(a) Gold

(b) Bromine ✓

(c) Lead

(d) Silver

45. The compound which has same empirical formula is:

(a) C₆H₆

(b) C₆H₁₂O₆

(c) CH₃COOH

(d) Both b and c ✓

46. CaO is the chemical formula of:

(a) Lime stone

(b) Quick lime ✓

(c) Caustic soda

(d) Slaked lime

47. How many elements occur naturally?

(a) 92 ✓

(b) 96

(c) 98

(d) 100

48. is the symbol of which one of the following?

(a) Ammonium  ion

(b) Cyanide

(c) Bisulphate ✓

(d) Bicarbonate

49. The formula mass of K₂SO₄ is:

(a) 174 amu ✓

(b) 174 g

(c) 170 amu

(d) 170 g

50. Which one of the followings has sharp and fixed melting point?

(a) Compound ✓

(b) Mixture

(c) Both

(d) None of these

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