Fundamentals of Chemistry – MCQ’s

Fundamentals of Chemistry – MCQ’s

1. The branch of chemistry which deals with the study of all elements and their compounds except compounds of carbon and hydrogen and their derivatives is called.

(a) Organic chemistry

(b) Physical chemistry

(c) Inorganic chemistry ✓

(d) Bio chemistry

2. Which one of the followings provides the identity of a substance?

(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