This document contains a 50 question chemistry mcqs test with an answer key. The test covers topics in general chemistry including the building blocks of matter, chemical formulas, chemical equations, states of matter, density, the periodic table, and acid-base chemistry. It is intended as a practice test for entry-level exams. The document was created by Dr. Sajid Ali Talpur and contains additional links to other chemistry and biology tests and study materials also authored by Dr. Talpur.

1. Chemistry mcqs test (1)
For Entry Test
Chemistry Test: 1 Dr. Sajid Ali Talpur

2. 1. The building block of matter is:
a) electron b) atom
c) element d) molecule
2. 12 kg of carbon represent its:
a) 1 mol b) 10 mol
c) 100 mol d) 1000 mol
3. Which of the following is compound:
a) honey b) milk
c) water d) A.O.T
e) N.O.T
4. Urine and blood are studied under the
disciplines of_______Chemistry.
a) organic b) inorganic
c) physical d) bio
5. It takes part in the chemical reaction:
a) electron b) proton
c) neutron d) atom
6. NaCl represents one molecule of table salt:
a) true b) false
7. The exponential notation form of 100.50 is:
a) 1 × 10-2 b) 100.50 × 102
2
c) 1005 × 10 d) 100.50 × 10-2
8. What is the mass of a substance whose density
is 4 kg/ dm3 and volume 2 dm3
a) 2 kg b) 4 kg
c) 6 kg d) 8 kg
Chemistry Test: 2 Dr. Sajid Ali Talpur

3. 9. H+ has:
a) one electron
b) one proton
c) one electron and one proton
d) one proton and one neutron
e) one electron one proton and one neutron
10. It is a form of energy:
I. Light
II. Sound
III. sun
a) 1 only
b) 3 only
c) 1 and 2 only
d) 2 only 3 only
e) 1, 2 and 3
11. Which of the following are equal by mass:
a) proton and H+ b) electron and H-
c) neutron and H d) A.O.T
12. Regarding the atom all are true except:
a) it is neutral b) it is destructible
c) its mass lies in nucleus
d) isotopes are due to variation in protons
e) chemical properties are due to valence
electrons
13. Which of the following is the lightest:
a) electron b) proton
c) neutron d) H atom
d) α-paticle
Chemistry Test: 3 Dr. Sajid Ali Talpur

4. Questions 14 – 18
Select from the terms below:
a) boiling b) evaporation
c) sublimation d) melting
d) freezing e) N.O.T
14. conversion of solid into liquid is called
15. conversion of solid into gas
16. conversion of gas into solid
17. conversion of liquid into solid
18. it’s a cooling process
19. Which of the following is the heaviest:
a) electron b) proton
c) neutron d) H atom
d) α-paticle
20. 100.10 has significant figures:
a) 3 b) 4
c) 5 d) 6
21. 1.9 will be rounded off as:
a) 2 b) 2.0
c) 1 d) 2.1
22. Water has high boiling point due to:
a) covalent bond b) ionic bond
c) polar bond d) H-bond
Chemistry Test: 4 Dr. Sajid Ali Talpur

5. 23. Find the mis match:
a) α-particle : proton
b) β-particle : electron
c) γ-particle : neutron
d) α-particle : H atom
e) α-particle : He nucleus
24. density of water is:
a) less than ice b) greater than ice
c) equal to ice d) all are possible
25. 1kg iron is not denser than 1kg cotton
a) true b) false
26. Which one has the highest degree of polarity:
a) H-Br b) H-I
c) H-Cl d) H-F
27. Log ab =
a) log a + b b) log a –b
c) log a /b d) n log a
28. NaCl = 58.5 a.m.u; represents its:
a) atomic mass b) molecular mass
c) formula mass d) molar mass
29. What is the molecular formula of a compound
whose molecular mass is 28 and empirical
formula CH:
a) CH4 b) C2H2
c) C2H4 d) C2H6
Chemistry Test: 5 Dr. Sajid Ali Talpur

6. 30. 24g of carbon contain _____atoms of carbon:
a) 6.02×1023 b) 2×6.02×1023
23
c) 12×6.02 × 10 d) 24×6.02 × 1023
31. What is the empirical formula of ethane C2H6
a) CH b) CH2
c) CH3 d) N.O.T
32. Limiting reactant determines the amount of
product to be formed:
a) true b)false
33. How many particles are there in 36g of
magnesium:
a) 6.02 × 1023 b) 9.03 × 1022
c) 90.3 × 1022 d) 12.04 × 1023
34. The reaction will go forward if
product/reactants(initial) is:
a) less than Kc b) greater than Kc
c) equal to Kc d) All are possible
35. What is the activation energy of a reaction
whose internal energy is 5 J and threshold
energy 12 J
a) 5 J b) 7 J
c) 17 J d) 60 J
36. The equilibrium of the reaction 2NO + O2 ↔
2NO2 is not affected by:
a) increase in temperature
b) increase in pressure c) catalyst
d) N.O.T
Chemistry Test: 6 Dr. Sajid Ali Talpur

7. Questions 37 – 46
Select from the terms below:
A) Endothermic reaction b) Exothermic reaction
37. Respiration is:
38. Bomb blast is:
39. Decomposition reaction is:
40. Photosynthesis is:
41. Bond formation is:
42. Bond breaking is:
43. Freezing is:
44. Evaporation is:
45. Melting is:
46. Combustion is:
47. Regarding 2 g of hydrogen gas all are true
except:
a) contains 6.02 × 1023 molecules
b) molecular mass
c) one mole
d) 22.4dm3
e) N.O.T
Chemistry Test: 7 Dr. Sajid Ali Talpur

8. 48. All of the followings show red color in the
acidic pH except:
a) methyl orange b) litmus
c) Phenolphthalein d) universal indicator
49. Which of the following solution has high pH
a) water + NaCl b) water + NaOH
c) water + HCl d) water + milk
50. Oxidation number of all the elements in the free
state is:
a) 0 b) -1
c) + 1 d) -2
Answer Key
1 B 2 D 3 C
4 D 5 A 6 B
7 C 8 D 9 B
10 C 11 A 12 D
13 A 14 D 15 C
16 E 17 D 18 B
19 D 20 C 21 A
22 D 23 D 24 B
25 B 26 D 27 B
28 C 29 C 30 B
31 C 32 A 33 C
34 A 35 B 36 C
37 B 38 B 39 A
40 A 41 B 42 A
43 B 44 A 45 A
46 B 47 B 48 C
49 B 50 A
Chemistry Test: 8 Dr. Sajid Ali Talpur

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Chemistry Test: 9 Dr. Sajid Ali Talpur

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Chemistry Test: 10 Dr. Sajid Ali Talpur

11. Chemistry Test: 11 Dr. Sajid Ali Talpur