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30 Chemistry Questions – Timed Quiz!

Get ready to challenge yourself with 30 multiple-choice Chemistry questions tailored for JAMB, WAEC, JUPEB, and Nursing students.

🕒 You have 15 minutes to complete this quiz
✅ Read each question carefully
🚀 Test your speed, accuracy, and understanding📘

The electronic configuration of an element is 1S2 2S2 2P6 3S2 3P3. How many unpaired electrons are there in the element?

A. 5

B. 4

C. 3

D. 2

None

Which of the following can be obtained by fractional distillation?

A. Nitrogen from liquid air

B. Sodium Chloride from sea water

C. Iodine from solution of Iodine in carbon tetrachloride

D. Sulphur from the solution of sulphur in carbon disulphide

None

Duralumin consists of aluminum, copper?

A. Zinc and Gold

B.Lead and Manganese

C.Nickel and Silver

D.Manganese and Magnesium

None

The number of atoms in 3.0 moles of oxygen molecules is:

A. 3.0 × 10²³

B. 6.02 × 10²³

C. 9.03 × 10²³

D. 3.61 × 10²⁴

None

Which of the following gases will diffuse fastest under the same conditions?

A. CO₂

B. O₂

C. CH₄

D. Cl₂

None

The oxidation number of sulfur in H₂SO₄ is:

A. +2

B. +4

C. +6

D. –2

None

Which of the following is a chemical change?

A. Dissolving sugar in water

B. Melting of ice

C. Rusting of iron

D. Breaking of glass

None

The valency of phosphorus in PCl₅ is:

A. 1

B. 3

C. 4

D. 5

None

The pH of 0.01 M HCl solution is approximately:

A. 1

B. 2

C. 3

D. 4

None

A compound contains 40% sulfur and 60% oxygen. Its empirical formula is:

A. SO

B. SO₂

C. S₂O₃

D. SO₃

None

Which of the following elements has the highest electronegativity?

A. Fluorine

B. Oxygen

C. Chlorine

D. Nitrogen

None

The gas responsible for the characteristic smell of rotten eggs is

A. SO₂

B. NH₃

C. H₂S

D. NO₂

None

The number of unpaired electrons in phosphorus atom (Z = 15) is:

A. 1

B. 2

C. 3

D. 4

None

The major product of complete combustion of ethanol is:

A. CO

B. CO₂ and H₂O

C. C and H₂O

D. CH₄ and CO₂

None

Which of the following is used as an antacid?

A. Na₂CO₃

B. CaO

C. Mg(OH)₂

D. H₂SO₄

None

Which of the following oxides is amphoteric?

A. Na₂O

B. CO₂

C. Al₂O₃

D. SO₃

None

Which of the following processes does not involve oxidation?

A. Rusting

B. Respiration

C. Photosynthesis

D. Combustion

None

The shape of NH₃ molecule is:

A. Tetrahedral

B. Linear

C. Trigonal pyramidal

D. Planar

None

The solubility of a gas in liquid increases with:

A. Increase in temperature

B. Decrease in pressure

C. Increase in pressure

D. None of the above

None

Which of these is not a member of the homologous series?

A. CH₄

B. C₂H₆

C. C₃H₈

D. CH₃OH

None

The process of removing hardness from water using washing soda is known as:

A. Chlorination

B. Precipitation

C. Ion exchange

D. Filtration

None

Which of these is a transition element?

A. Na

B. Ca

C. Fe

D. K

None

In the electrolysis of CuSO₄ solution using copper electrodes,

A. Cu dissolves at anode, deposited at cathode

B. Cu dissolves at cathode

C. Cu₂O forms at cathode

D. Oxygen forms at anode

None

The hybridization of carbon in ethyne (C₂H₂) is:

A. sp³

B. sp²

C. sp

D. None

None

The type of bond in NaCl is:

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

None

Which of these statements is true about catalysts?

A. They are consumed in reactions

B. They increase activation energy

C. They increase reaction rate without being used up

D. They change equilibrium position

None

The first element in period 3 that can form a covalent bond is:

A. Na

B. Mg

C. Al

D. Si

None

A solution turns red litmus blue. It is likely to contain:

A. HCl

B. NaOH

C. CH₃COOH

D. H₂SO₄

None

The molar volume of an ideal gas at STP is:

A. 11.2 dm³

B. 22.4 dm³

C. 44.8 dm³

D. 2.24 dm³

None

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Otobor Emmanuel is a certified Radiographer, Website Developer, and Digital Marketing Manager. Through Manny Spark, he supports students with reliable exam materials and past questions for JAMB, WAEC, NECO, JUPEB, IJMB, Pre-Degree, School of Nursing, Master’s, and PhD programs. He also provides quality tutorials for O’Level, A’Level, and pre-clinical medical classes.

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30 Chemistry Questions – Timed Quiz!

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