CONTINOUS ASSESSMEN FOR S.S.1 FIRST TERM 26/27

CONTINOUS ASSESSMEN FOR S.S.1 FIRST TERM 26/27 - Quiz

1. Isoelectronic with Argon (2,8,8)
Na+

A) Mg2+
B) Al3+
C) Ca2+
D) O2
E) cl-

2. Which technique is best for separating a
mixture of iodine and sand?

A) Decantation
B) Distillation
C) centrifugation
D) Filtration
E) Sublimation

3. Two miscible liquids with boiling points 78°C
and 100°C are best separated by:

A) Filtration
B) Simple distillation
C) Chromatography
D) Fractional distillation
E) Separating funnel

4. An ion X2+ has 10 electrons and mass number
24. Its atomic number is:

A) 16
B) 14
C) 10
D) 8
E) 12

5. The difference between mass number and
atomic number gives:

A) Charge of ion
B) Number of neutrons
C) No symbol
D) Number of shells
E) Number of protons

6. The subatomic particle with zero electric
charge is the:

A) Energy levels
B) Proton
C) Positron
D) Electron
E) Neutron

7. Air is classified as a mixture because its
constituent gases:

A) Retain individual properties
B) Can vary in proportion
C) No chemical symbol
D) Can be separated physically
E) All of the above

8. The components of a compound can only be
separated by:

A) Chemical or electrochemical reactions
B) Magnetization
C) Filtration
D) Adding soap
E) Physical methods

9. An element with atomic number Z = 17
(Chlorine) has the configuration:

A) 2, 8, 8
B) 2, 7, 8
C) 2, 8, 7
D) 2, 8,1
E) 2, 8, 6

10. . How many valence electrons are present in
Calcium (Z = 20)?

A) 8
B) 2
C) 3
D) 1
E) 4

11. The maximum number of electrons in the M
shell (n=3) is:

A) 18
B) 88
C) 10
D) 8
E) 32

12. Freezing of water to ice involves:

A) work of God
B) Chemical decomposition
C) Liberation of energy (Physical)
D) Permanent mass gain
E) Formation of new chemical bonds

13. Decaying of organic matter in a compost heap
is a:

A) Non-chemical process
B) Physical change
C) Reversible physical process
D) Chemical change
E) None of the answer

14. An atom with atomic number 11 and mass number 23 has how many neutrons?

A) 23
B) 19
C) 11
D) 34
E) 12

15. 26.
What is the relative molecular mass of calcium carbonate, CaCO3? [Ca = 40, C = 12, O = 16]

A) 50
B) 68
C) 120
D) 100
E) 69

16. 31.
What is the percentage by mass of oxygen in water (H2O)? [H = 1, O = 16]

A) 33.3%
B) 5.6%
C) 88.9%
D) 34.8%
E) 11.1%

17. 27.
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. Its empirical formula is: [C=12, H=1, O=16]

A) C6H6
B) CHO
C) CH3O
D) C2H4O
E) CH2O

18. 35.
What is the oxidation number of chlorine in HClO3?

A) =4
B) +3
C) +1
D) +7
E) +5

19. 31.
What is the percentage by mass of hydrogen in water

A) 5.6%
B) 17.1%
C) 33.3%
D) 11.1%
E) 88.9%

20. 25.
The symbol for the element gold is:

A) Gd
B) Go
C) Ag
D) Pd
E) Au

21. 10.
The fundamental particles present in the nucleus of an atom are:

A) Protons and electrons
B) Neutrons
C) Electrons and Neutron
D) Electrons
E) Protons and neutrons

22. 11.
The atomic number of an element is equal to the number of:

A) Valence electrons
B) Neutrons in the nucleus
C) Mass Number
D) Nucleons
E) Protons in the nucleus

23. The conversion of a solid directly into a gas without passing through the liquid state is called:

A) Sublimation
B) Melting
C) Evaporation
D) Boiling
E) Condensation

24. Element X has two isotopes: 60% 10X and 40%
11X. Calculate RAM:

A) 11.5
B) 10.8
C) 10.2
D) 10.4
E) 10.5

25. The continuous region around a nucleus
where electron probability is high is an

A) Axis
B) Orbit
C) Orbital
D) None
E) Energy shell

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