9th class chemistry Chapter no.1 MCQs
Unit no.1 MCQS of 9th Class Chemistry
Fundamentals of Chemistry:
- Industrial chemistry deals with the manufacturing of compounds:
a. On commercial scale
b. In the laboratory
c. On economic scale
d. On micro scale
2. Which one of the following compounds can be separated by physical means?
a. compounds
b. mixtures
c. radicals
d. elements
3. How compounds are formed in industrial chemistry?
a. On commercial scale
b. In laboratory
c. On economic scale
d. On small scale
4. The knowledge that provides understanding of this world and how it works, is called:
a. Science
b. Physics
c. Medical
d. Chemistry
5. Organic chemistry is the study of:
a. chemical compounds
b. Hydrocarbons
c. Polar compounds
d. Inorganic compounds
6. The analysis of compounds is carried out by …… methods:
a. Four
b. Two
c. Five
d. Three
7. The composition and properties of matter is studied in:
a. Biology
b. Physics
c. Mathematics
d. Chemistry
8. The study of hydrocarbons is called:
a. Organic chemistry
b. Physical chemistry
c. Inorganic chemistry
d. Analytical chemistry
9. The study of glass and ceramic industry are related to:
a. Chemical chemistry
b. Organic chemistry
c. Industrial chemistry
d. Inorganic chemistry
10. The amount of each substance present in a sample is determined in:
a. Environmental chemistry
b. Qualitative analysis
c. Inorganic chemistry
d. Quantitative analysis
11. The most abundant element occurring in the oceans is:
a. Hydrogen
b. Silicon
c. Oxygen
d. Nitrogen
12. Which one of the following elements is found in most abundance in the earth’s crust?
a. Aluminum
b. Argon
c. Oxygen
d.Silicon
13. The third abundant gas found in the earth’s atmosphere is:
a. Oxygen
b. Argon
c. Carbon monoxide
d.Nitrogen
14. The number of naturally occurring elements is:
a. 92
b. 80
c. 109
d.86
15. The quantity of nitrogen by weight on Earth’s crust is:
a. 77%
b. 78%
c. 79%
d. 76%
16. The percentage quantity of oxygen in human body is:
a. 63
b. 66
c. 64
d. 65
17. The element occurring in the form of liquid is:
a. Chlorine
b. Bromine
c. Iodine
d. Fluorine
18. Elements are mostly found as:
a. Solid
b. Gas
c. Metalloids
d. Liquid
19. The lightest element is:
a. Magnesium
b. Lithium
c. Calcium
d.Sodium
20. The valency of boron is:
a. 3
b. 1
c. 4
d.2
21. The example of homogeneous mixture is:
a. Compounds
b. Ice cream
c. Radicals
d.Elements
22. Formula of washing soda is:
a. Na2CO3 .10H2O
b. Na2CO3
c. NaOH
d. NaCl
23. Formula of calcium oxide is:
a. KOH
b. CaO
c. CaCO3
d. Ca(OH)2
24. Empirical formula of glucose is:
a. CH2O
b. CH
c. H2O
d. CHO
25. Empirical formula of benzene is:
a. C2H2
b. CH2O
c. C6H6
d. CH
26. The valency of iron in ferric sulphate Fe2 (SO3 ) is:
a. 3
b. 1
c. 4
d. 2
27 . The percentage of nitrogen in air is:
a. 21%
b. 70%
c. 20%
d. 78%
28 . Atomic mass number of an element is represented as:
a. N
b. Z
c. K
d. A
29 . Atomic number of oxygen is:
a. 8
b. 6
c. 10
d. 9
30 . At room temperature, ……… is found in liquid form:
a. Zinc
b. Sodium
c. Mercury
d. Copper
31 . Atomic number of sodium is:
a. 12
b. 11
c. 13
d.10
32 . Isotope C-12 is found in quantity:
a. 99.7%
b. 96.9%
c. 98.9%
d.97.6%
33 . Mass number of hydrogen is:
a. 2
b. 0
c. -1
d. 1
34 . Element found in gaseous state is:
a. Oxygen
b. Mercury
c. Sodium
d. Gold
35 . Which one of the following can be separated by physical means?
a. Element
b. Radical
c. Mixture
d. Compound
36 . Molecular formula of glucose is:
a. CH2O
b. C6H12o6
c. C2H4O2
d. CHO
37 . Molecular mass of benzene is:
a. C6H12O6
b.H2O2
c. C6H6
d.CH2O
38 . Empirical formula of hydrogen per oxide is:
a. CH2O
b. CH
c. SiO
d. OH
39 . The matter in its pure form is called:
a. Solution
b. Substance
c. Component
d. Mixture
40 . The percentage of oxygen in Earth’s Crust is:
a. 47%
b. 28%
c. 50%
d. 48%
41 . The percentage of oxygen in Oceans is:
a. 86%
b.48%
c. 78%
d. 90%
42 . The percentage of oxygen in atmosphere is:
a. 21%
b. 86%
c. 11%
d. 47%
43 . The percentage of silicon in Crust of Earth is:
a. 29%
b. 27%
c. 25%
d. 28%
44 . The percentage of chlorine in Oceans is:
a. 4.6%
b. 2.1%
c. 9.2%
d. 1.8%
45 . The percentage of hydrogen in oceans is:
a. 14%
b. 20%
c. 11%
d. 25%
46 . Total elements discovered now are:
a. 112
b. 92
c. 110
d. 118
47 . The majority of elements exists in nature are in the form of:
a. Gases
b. Solids
c. Plasma
d. Liquids
48 . The combining property of an element with other elements is called:
a. Chemical property
b. Valency
c. Atomic number
d. Physical property
49 . The valency of oxygen is:
a. 3
b .1
c. 4
d. 2
50 . The valency of sodium is:
a. 3
b. 1
c. 4
d. 2
51 . The valency of sulphate is:
a. 3
b. 1
c. 4
d. 2
52 . The fix ratio of carbon and oxygen in carbon dioxide is:
a. 2:5
b. 3:5
c. 2:9
d. 3:8
53 . An example of homogeneous mixture is:
a. Soil
b. Rock
c. Air
d. Wood
54 . An example of heterogeneous mixture is:
a. Rock
b. Air
c. Ice cream
d. Gasoline
55 . The atomic number is represented by the alphabet:
a. N
b. A
c. O
d. Z
56 . The mass of each proton and neutron is:
a. 1.5 amu
b. 1 amu
c. 3 amu
d. 2amu
57 . The simplest ratio of silicon and oxygen in silica is:
a. 1:4
b. 1:3
c. 2:3
d. 1:2
58 . Which one of the following molecule is not tri-atomic?
a. H2O
b. H2
c. CO2
d. O
59 . ……… is formed with the removal of an electron from an atom:
a. Molecular cation
b. Cation
c. Molecular anion
d. Anion
60 . All are tri atomic molecules except:
a. H2O
b. H2
c. CO2
d. O3
61 . Molar mass usually expressed in grams. Which one of the following is molar mass of O in amu?
a. 1.92 x 10-25 amu
b. 32 amu
c. 192 x 10-25 amu
d. 53.12 x 10-24 amu
62 . Sea water is a source of how many naturally occurring elements?
a. 71
b. 43
c. 92
d. 63
63 . Which of the following pair of elements has equal mass?
a. One mole CO2 and one mole N2
b. One mole CO and one mole CO2
c. One mole O and one mole CO2
d. One mole CO and one mole N2
64 . Which one of the following is not a triatomic molecule?
a. H2O
b. O3
c. CO2
d. H2
65 . The charge on cation is:
a. 0
b. +1
c. -1
d. All
66 . The charge on anion is:
a. +2
b. +1
c. 0
d. -1
67 . The charge on a molecule is always:
a. Zero
b. Positive
c. Negative
d. All are possible
68 . An example of triatomic molecule is:
a. Hydrogen
b. Carbon dioxide
c. None
d. Oxygen
69 . How many numbers of moles are equivalent to 8 grams of CO ?
a. 0.21
b. 0.15
c. 0.24
d. 0.18
70 . The mass of one molecule of water is:
a. 18 mg
b. 18 amu
c. 18 kg
d. 18 g
71 . The molar mass of H2SO4 is:
a. 9.8 g
b. 98 g
c. 9.8 amu
d. 98 amu
72 . Which one of the following is a molecular mass of O2 in amu?
a. 1.92 x 10-24
b. 32 amu
c. 192 x 10-25
d. 53.12 x 10-24
73 . The formula mass of potassium sulphate (K2 SO4 ) is:
a. 184 amu
b. 174 amu
c. 194 amu
d. 164 amu
74 . Molecular mass of nitric acid HNO3 is:
a. 62 amu
b. 65 amu
c. 60 amu
d. 63 amu
75 . Molecular mass of phosphoric acid (H3 PO4) is:
a. 63 gmol-1
b. 98 gmol-1
c. 60 gmol-1
d. 100 gmol 1
76 . Molecular mass of CO2 is:
a. 44 amu
b. 34 amu
c. 50 amu
d. 40 amu
77 . Gram atomic mass of hydrogen is:
a. 2.016 g
b. 1.08 amu
c. 1.008 g
d. 1.008amu
78 . One AMU (atomic mass unit) is equivalent to:
a. 1.66×10-23g
b. 1.66×10-24g
c. 1.66×10-24kg
d. 1.66×10-24mg
79 . The mass of electron is equal to:
a. 5.48 x 10-4 amu
b. 1.0073 amu
c. 1.66 x 10-2 amu
d. 1.0089 amu
click here to go directly on Chapter no.2