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Civil and Mechanical

w chemistry 24

Written by Admin December 3, 2025December 3, 2025

Chemistry Weac 2024

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Question 1 of 50

1. Question

Which of the following statements describes transition elements? They

are very reactive
Correct Incorrect Correct answer

have low melting points
Correct Incorrect Correct answer

possess variable oxidation state
Correct Incorrect Correct answer

form colourless salts
Correct Incorrect Correct answer

Correct

Incorrect
Question 2 of 50

2. Question

The volume of 22g of CO $_{2}$ at stp is equivalent to [C =12, O =16, molar volume at stp = 22.4 dm^ $^{3}$ ]

22.0 dm3
Correct Incorrect Correct answer

22.4 dm^3
Correct Incorrect Correct answer

11.2 dm^3
Correct Incorrect Correct answer

5.6 dm^3
Correct Incorrect Correct answer

Correct

Incorrect
Question 3 of 50

3. Question

The oxidation number of iron, in its free state is

0
Correct Incorrect Correct answer

+1
Correct Incorrect Correct answer

+2
Correct Incorrect Correct answer

+3
Correct Incorrect Correct answer

Correct

Incorrect
Question 4 of 50

4. Question

Which of the following gases could be collected by downward displacement of air?

Chlorine
Correct Incorrect Correct answer

Hydrogen
Correct Incorrect Correct answer

hydrogen chloride
Correct Incorrect Correct answer

Sulphur(IV) oxide
Correct Incorrect Correct answer

Correct

Incorrect
Question 5 of 50

5. Question

Aluminium is suitable for making alloys for aircraft construction because it

is hard and brittle
Correct Incorrect Correct answer

is light and very resistant to corrosion
Correct Incorrect Correct answer

has high density and also a non-conductor of electricity
Correct Incorrect Correct answer

is amphoteric and allotropic
Correct Incorrect Correct answer

Correct

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Question 6 of 50

6. Question

Pairs of outermost shell electrons which are not used in bonding are

lone pairs
Correct Incorrect Correct answer

bonding pairs
Correct Incorrect Correct answer

valence electrons
Correct Incorrect Correct answer

electrovalent electrons
Correct Incorrect Correct answer

Correct

Incorrect
Question 7 of 50

7. Question

Water pipes are produced from

polyethene
Correct Incorrect Correct answer

Perspex
Correct Incorrect Correct answer

polystyrene
Correct Incorrect Correct answer

poly vinyl chloride
Correct Incorrect Correct answer

Correct

Incorrect
Question 8 of 50

8. Question

Which of the following substances has the lowest boiling point?

Aqueous sodium chloride
Correct Incorrect Correct answer

Ethanol
Correct Incorrect Correct answer

Tetrachloromethane
Correct Incorrect Correct answer

Water
Correct Incorrect Correct answer

Correct

Incorrect
Question 9 of 50

9. Question

Which of the following arrangements of elements is in order of increasing ionization energy?

Si, Al, S, P
Correct Incorrect Correct answer

S, P, Si, Al
Correct Incorrect Correct answer

Al, Si, P, S
Correct Incorrect Correct answer

P, Si, S, Al
Correct Incorrect Correct answer

Correct

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Question 10 of 50

10. Question

isomers
Correct Incorrect Correct answer

isotopes
Correct Incorrect Correct answer

allotropes
Correct Incorrect Correct answer

isoelectronic
Correct Incorrect Correct answer

Correct

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Question 11 of 50

11. Question

Consider the reaction represented by the following equation:

2, 3 and 2
Correct Incorrect Correct answer

2, 2 and 3
Correct Incorrect Correct answer

1, 2 and 1
Correct Incorrect Correct answer

1, 1 and 1
Correct Incorrect Correct answer

Correct

Incorrect
Question 12 of 50

12. Question

The branch of science that deals with the nature and properties of substances and how one substance can be converted to another is known as

biology
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chemistry
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geography
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physics
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Question 13 of 50

13. Question

Consider the reaction represented by the equation:

If 0.1 mole of C $_{3}$ H $_{8}$ was completely burnt, what volume of CO $_{2}$ would be produced at stp? [volume of gas at stp = 22.4dm^ $^{3}$ mol^ $^{- 1}$ ].

6.72dm^3
Correct Incorrect Correct answer

2.24dm^3
Correct Incorrect Correct answer

0.30dm^3
Correct Incorrect Correct answer

0.10dm^3
Correct Incorrect Correct answer

Correct

Incorrect
Question 14 of 50

14. Question

Pure water contaminated with quicklime will have a pH of

1
Correct Incorrect Correct answer

6
Correct Incorrect Correct answer

7
Correct Incorrect Correct answer

8
Correct Incorrect Correct answer

Correct

Incorrect
Question 15 of 50

15. Question

The electron configuration contravenes the

Pauli's exclusion principle
Correct Incorrect Correct answer

Aufbau's principle
Correct Incorrect Correct answer

octet rule
Correct Incorrect Correct answer

Hund's rule
Correct Incorrect Correct answer

Correct

Incorrect
Question 16 of 50

16. Question

Naturally occurring Boron is made up of 19.9% $^{10}$ B and 80.1% $^{11}$ B. The relative atomic mass of Boron is[ means 10B, same for 11B]

21.0
Correct Incorrect Correct answer

10.8
Correct Incorrect Correct answer

10.5
Correct Incorrect Correct answer

10.0
Correct Incorrect Correct answer

Correct

Incorrect
Question 17 of 50

17. Question

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct

Incorrect
Question 18 of 50

18. Question

The oxidation number of Chromium in is

+2
Correct Incorrect Correct answer

+6
Correct Incorrect Correct answer

+7
Correct Incorrect Correct answer

+12
Correct Incorrect Correct answer

Correct

Incorrect
Question 19 of 50

19. Question

The number of shared pair of electrons in a molecule of methane is

2
Correct Incorrect Correct answer

4
Correct Incorrect Correct answer

6
Correct Incorrect Correct answer

8
Correct Incorrect Correct answer

Correct

Incorrect
Question 20 of 50

20. Question

When s and p block elements react, the bond formed is

electrovalent
Correct Incorrect Correct answer

covalent
Correct Incorrect Correct answer

metallic
Correct Incorrect Correct answer

dative-covalent
Correct Incorrect Correct answer

Correct

Incorrect
Question 21 of 50

21. Question

The most important ore of aluminium is

bauxite
Correct Incorrect Correct answer

haematite
Correct Incorrect Correct answer

magnetite
Correct Incorrect Correct answer

monazite
Correct Incorrect Correct answer

Correct

Incorrect
Question 22 of 50

22. Question

Isotopes of the same element have similar chemical properties because they have the same number of

nuclides
Correct Incorrect Correct answer

protons
Correct Incorrect Correct answer

neutrons
Correct Incorrect Correct answer

atoms
Correct Incorrect Correct answer

Correct

Incorrect
Question 23 of 50

23. Question

The hardest form of carbon is

charcoal
Correct Incorrect Correct answer

coke
Correct Incorrect Correct answer

diamond
Correct Incorrect Correct answer

graphite
Correct Incorrect Correct answer

Correct

Incorrect
Question 24 of 50

24. Question

Bases normally

are corrosive
Correct Incorrect Correct answer

turn litmus paper from blue to red
Correct Incorrect Correct answer

turn litmus paper from red to blue
Correct Incorrect Correct answer

are non-metal oxides
Correct Incorrect Correct answer

Correct

Incorrect
Question 25 of 50

25. Question

Which of the following household liquids would be effective in treating someone with too much acid in the stomach?

Strong salt solution with pH 7.0
Correct Incorrect Correct answer

Tomato juice with pH 4.1
Correct Incorrect Correct answer

Milk of Magnesia with pH 10.5
Correct Incorrect Correct answer

Black coffee with pH 5.0
Correct Incorrect Correct answer

Correct

Incorrect
Question 26 of 50

26. Question

The metallic bonding in aluminium is strong because of large number of

delocalized electrons
Correct Incorrect Correct answer

immobile electrons
Correct Incorrect Correct answer

lone pair electrons
Correct Incorrect Correct answer

valence electrons
Correct Incorrect Correct answer

Correct

Incorrect
Question 27 of 50

27. Question

The product formed when concentrated sodium chloride solution is electrolysed using carbon electrodes is

chloride water
Correct Incorrect Correct answer

hydrochloric acid
Correct Incorrect Correct answer

sodium hydroxide
Correct Incorrect Correct answer

sodium oxochlorate (I)
Correct Incorrect Correct answer

Correct

Incorrect
Question 28 of 50

28. Question

26.0%
Correct Incorrect Correct answer

45.5%
Correct Incorrect Correct answer

71.5%
Correct Incorrect Correct answer

84.0%
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Correct

Incorrect
Question 29 of 50

29. Question

How many covalent bonds are formed by Nitrogen?

1
Correct Incorrect Correct answer

2
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3
Correct Incorrect Correct answer

4
Correct Incorrect Correct answer

Correct

Incorrect
Question 30 of 50

30. Question

The product of the reaction between ethanol and excess acidified is

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct

Incorrect
Question 31 of 50

31. Question

Catalysts alter reaction rates by

providing an alternative reaction pathway
Correct Incorrect Correct answer

lowering the energy of reaction
Correct Incorrect Correct answer

increasing the surface area of reactants
Correct Incorrect Correct answer

aligning the reactant molecules properly
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Correct

Incorrect
Question 32 of 50

32. Question

When an element exists in two or more forms in the same physical state, it exhibits

isotopy
Correct Incorrect Correct answer

allotropy
Correct Incorrect Correct answer

isobars
Correct Incorrect Correct answer

isomerism
Correct Incorrect Correct answer

Correct

Incorrect
Question 33 of 50

33. Question

Which of the following statements about ammonium salt is correct? It

dissolves in water to form solution of pH > 1
Correct Incorrect Correct answer

dissolves in water to form solution of pH < 7
Correct Incorrect Correct answer

does not decompose on heating
Correct Incorrect Correct answer

is insoluble in water
Correct Incorrect Correct answer

Correct

Incorrect
Question 34 of 50

34. Question

Ethane of volume 400 cm $^{3}$ was completely burnt in excess oxygen according to the following equation:

Calculate the volume of steam that would be produced.

200cm^3
Correct Incorrect Correct answer

400cm^3
Correct Incorrect Correct answer

600cm^3
Correct Incorrect Correct answer

1200cm^3
Correct Incorrect Correct answer

Correct

Incorrect
Question 35 of 50

35. Question

An atom of an element in the ground state contains 8 valence electrons. The element is considered as a

metal
Correct Incorrect Correct answer

semi-metal
Correct Incorrect Correct answer

noble gas
Correct Incorrect Correct answer

halogen
Correct Incorrect Correct answer

Correct

Incorrect
Question 36 of 50

36. Question

Ethanedioic acid is an organic solid that can be purified by

decantation
Correct Incorrect Correct answer

distillation
Correct Incorrect Correct answer

crystallization
Correct Incorrect Correct answer

filtration
Correct Incorrect Correct answer

Correct

Incorrect
Question 37 of 50

37. Question

A saturated solution at 30 celsius will normally produce crystals at a temperature of

50 C
Correct Incorrect Correct answer

40 C
Correct Incorrect Correct answer

35 C
Correct Incorrect Correct answer

20 C
Correct Incorrect Correct answer

Correct

Incorrect
Question 38 of 50

38. Question

The main function of limestone in the blast furnace during the extraction of iron is to

act as catalyst
Correct Incorrect Correct answer

remove impurities
Correct Incorrect Correct answer

act as a reducing agent
Correct Incorrect Correct answer

supply Carbon(IV) oxide
Correct Incorrect Correct answer

Correct

Incorrect
Question 39 of 50

39. Question

Which of the following functional groups is present in alkanoic acid?

-COOH
Correct Incorrect Correct answer

-OH
Correct Incorrect Correct answer

-COOR
Correct Incorrect Correct answer

-CHO
Correct Incorrect Correct answer

Correct

Incorrect
Question 40 of 50

40. Question

The following organic compounds are polymers except

rubber
Correct Incorrect Correct answer

starch
Correct Incorrect Correct answer

proteins
Correct Incorrect Correct answer

fats
Correct Incorrect Correct answer

Correct

Incorrect
Question 41 of 50

41. Question

Which of the following is a monomer of polythene?

Ethanol
Correct Incorrect Correct answer

Vinyl chloride
Correct Incorrect Correct answer

Ethene
Correct Incorrect Correct answer

Ethane
Correct Incorrect Correct answer

Correct

Incorrect
Question 42 of 50

42. Question

In ethanol, the attractive forces between adjacent molecules are

covalent bonds only
Correct Incorrect Correct answer

hydrogen bonds only
Correct Incorrect Correct answer

hydrogen bonding and Van der Waal's forces
Correct Incorrect Correct answer

Van der Waal's forces only
Correct Incorrect Correct answer

Correct

Incorrect
Question 43 of 50

43. Question

According to the collision theory of reaction rates, which of the following conditions is not required for two molecules to react? The molecules must

come into contact without loss of energy on colliding with each other
Correct Incorrect Correct answer

collide with enough energy to overcome the activation energy barrier
Correct Incorrect Correct answer

collide in an orientation that makes formation of product possible
Correct Incorrect Correct answer

possess enough speed to overcome intermolecular forces of attraction
Correct Incorrect Correct answer

Correct

Incorrect
Question 44 of 50

44. Question

Which of the following compounds is formed by the oxidation of ethanol?

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct Incorrect Correct answer

Correct

Incorrect
Question 45 of 50

45. Question

At 25 degrees , the saturated solution of a salt in water was found to contain 0.24g of the salt in 100cm^ $^{3}$ . What is the solubility of the salt in gdm^ $^{- 1}$ ?

0.024
Correct Incorrect Correct answer

0.240
Correct Incorrect Correct answer

2.40
Correct Incorrect Correct answer

24.0
Correct Incorrect Correct answer

Correct

Incorrect
Question 46 of 50

46. Question

A weak acid is one which

is not corrosive
Correct Incorrect Correct answer

completely ionizes in water
Correct Incorrect Correct answer

does not produce salt with alkali
Correct Incorrect Correct answer

slightly ionizes in water
Correct Incorrect Correct answer

Correct

Incorrect
Question 47 of 50

47. Question

Tetraoxosulphate (VI) acid is considered as a heavy chemical because

its relative molecular mass is high
Correct Incorrect Correct answer

a high tonnage is produced every year
Correct Incorrect Correct answer

it is an inorganic chemical
Correct Incorrect Correct answer

it is used to manufacture heavy chemicals
Correct Incorrect Correct answer

Correct

Incorrect
Question 48 of 50

48. Question

Ni2+ ions are oxidized and Fe acts as a oxidizing agent
Correct Incorrect Correct answer

Ni2+ ions are oxidized and Fe acts as a reducing agent
Correct Incorrect Correct answer

Ni2+ ions are reduced and Fe acts as an oxidizing agent
Correct Incorrect Correct answer

Ni2+ ions are reduced and Fe acts as a reducing agent.
Correct Incorrect Correct answer

Correct

Incorrect
Question 49 of 50

49. Question

Which of the following conditions are necessary for the preparation of alkanoates from alkanols and alkanoic acid?

Water and NaOH
Correct Incorrect Correct answer

Conc. H2SO4 and heat
Correct Incorrect Correct answer

NaOH and heat
Correct Incorrect Correct answer

water and aqueous HCl
Correct Incorrect Correct answer

Correct

Incorrect
Question 50 of 50

50. Question

How many isomers can be formed from a compound with molecular formula C5H12? $_{5}$

one
Correct Incorrect Correct answer

two
Correct Incorrect Correct answer

three
Correct Incorrect Correct answer

four
Correct Incorrect Correct answer

Correct

Incorrect

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