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Chemistry Past Questions

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38 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

38 questions

Question 1 of 18 38 total questions

Question 11

waec 2010

The minimum amount of energy required for effective collisions between reacting particles is known as

Aactivation energy

Bbond energy

Ckinetic energy

Dpotential energy

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Question 12

waec 2010

The determination of heat of combustion is carried out with

Aa thermometer

Ba bomb calorimeter

Can evaporating dish

Da boiling tube

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Question 13

waec 2010

Which of the following gases contains the highest number of atoms at s.t.p?

A6 moles of neon

B3 moles of oxygen

C2 moles of chlorine

D1 mole of ethane

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Question 14

waec 2010

A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]

A5.8 seconds

B6.8 seconds

C9.4 seconds

D11.0 seconds

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Question 15

waec 2010

Which of the following apparatus can be used to measure accurately a specific volume of a liquid?

ABeaker

BConical flask

CMeasuring cylinder

DPipette

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Question 16

waec 2010

What is the volume occupied by 2 moles of ammonia at s.t.p?

A44.8 dm^-3

B22.4 dm^-3

C11.2 dm^-3

D5.6 dm^-3

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Question 17

waec 2010

A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm³ of solution. Calculate the concentration of the solution. [Na₂CO₃ = 106.0]

A0.4 mol dm^-3

B1.0 mol dm^-3

C10.6 mol dm^-3

D25.0 mol dm^-3

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Question 18

waec 2010

Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is

A2:2

B2:1

C1:2

D1:1

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Question 19

waec 2010

The bonds in crystaline ammonium chloride are?

Acovalent and dative

Bionic and covalent

Cionic covalent and dative

Dionic covalent and hydrogen bond

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Question 20

waec 2010

Which of the following molecules has a triple bond in its structure?

ACH₄

BNH₃

CN₂

DO ₂

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Question 21

waec 2010

Which of the following molecules has a linear shape?

ACH₄

BCO ₂

CH₂S

DNH ₃

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Question 22

waec 2010

A solid substance with high melting and boiling points is likely to be a/an

Acovalent compound

Bdative covalent compound

Celectrovalent compound

Dnon-metal

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Question 23

waec 2010

Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?

A₁₀M ³⁺

B₁₀M ^3-

C₁₃M ³⁺

D₁₃M ^3-

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Question 24

waec 2010

If X is a group lll element, its oxide would be represented as

AX₃O₂

BX₃O

CX₂O₃

DXO₃

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Question 25

waec 2010

Which of the following statements about chlorine and iodine at room temperature is correct?

AChlorine is gas and iodine is solid

BChlorine is liquid and iodine is gas

CChlorine and iodine are gases

DChlorine is solid and iodine is liquid

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Question 26

waec 2010

Which of the following elements is a d-block element?

ACalcium

Blron

CLithium

DSilicon

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Question 27

waec 2010

The energy change which accompanies the addition of an electron to a gaseous atom is

Aatomization

Belectron affinity

Celectronegativity

Dionization

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Question 28

waec 2010

Which of the following equations represents beta decay?

A\(\frac{14}{7}\)N + \(\frac{4}{2}\)He → \(\frac{8}{17}\)O + \(\frac{1}{1}\)H

B\(\frac{8238}{92}\)U → \(\frac{234}{90}\)Th + \(\frac{4}{2}\)He

C\(\frac{8238}{92}\)U → \(\frac{239}{93}\)Np + \(\frac{0}{-1}\)e

D\(\frac{13}{7}\)N + \(\frac{4}{2}\)He → \(\frac{16}{8}\)O + \(\frac{1}{1}\)H

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