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Q: Which of the following group comprise of elements

A) Mercury Water Ammonia

B) Iodine Tin Iron

C) Copper Aluminum Methane

D) Coal Smoke Fog

Answer: B. Iodine Tin Iron

Q: Which one of the following can be broken down into simpler substances

A) Ammonia

B) Oxygen

C) Sulphur

D) Iron filling

Answer: A. Ammonia

Q: The gram molecular mass of HNO₃ is

A) 60

B) 100

C) 63

D) 98

Answer: C. 63

Q: Which of these molecules is not a compound

A) N₂O

B) N₂

C) NO

D) NO₂

Answer: B. N₂

Q: Which one of the following is equal to two moles of water H₂O

A) 1.084x10²⁵ molecules

B) 6.022x10²³ molecules

C) 1.204x10²⁴ molecules

D) 1.806x10²⁴ molecules

Answer: C. 1.204x10²⁴ molecules

Q: A compound contains

A) different kinds of atoms mixed together

B) the same kind of atoms mixed together

C) different kinds of atoms chemically combined together

D) the same kind of atoms chemically combined together

Answer: C. different kinds of atoms chemically combined together

Q: Which one of the following is an example of triatomic molecule

A) NH₃

B) O₂

C) CO₂

D) CH₄

Answer: C. CO₂

Q: Hydrogen gas is

A) a monoatomic gas

B) a mixture of hydrogen atoms

C) a diatomic gas with each molecule made up of two atoms

D) a diatomic atom made up of two molecules

Answer: C. a diatomic gas with each molecule made up of two atoms

Q: Which one of the following compounds has both empirical and molecular formula identical

A) benzene C₆H₆

B) hydrogen peroxide H₂O₂

C) water H₂O

D) glucose C₆H₁₂O₆

Answer: A. benzene C₆H₆

Q: Which one of the following is a homogeneous mixture

A) smoke

B) air

C) fog

D) smog

Answer: B. air

Q: Which of the following solution is more dilute

A) 1.0M

B) 0.5M

C) 0.05M

D) 0.005M

Answer: D. 0.005M

Q: Milk is an example of

A) Compound

B) Saturated solution

C) Colloidal solution

D) Suspension

Answer: C. Colloidal solution

Q: Water droplet in air is an example of solution

A) Gas in gas

B) Gas in liquid

C) Liquid in gas

D) Liquid in liquid

Answer: C. Liquid in gas

Q: When there is a low concentration of solute in a solution it is known as

A) Dilute solution

B) Saturated solution

C) Concentrated solution

D) Super saturated solution

Answer: A. Dilute solution

Q: What is the molarity of a NaNO₃ solution made by diluting 250.0 cm3 of a 1.60 M solution to a final volume of 400 cm3

A) 1.20 M

B) 1.00 M

C) 0.200 M

D) 0.160 M

Answer: A. 1.20 M

Q: What is the concentration in percent mass by volume m/v of a solution containing 15.0 g KCl in 600.0 cm3 solution

A) 5.00%

B) 2.00%

C) 0.200%

D) 2.50%

Answer: D. 2.50%

Q: When KCl dissolves in water the following will be produced

A) K and Cl

B) K⁺ and Cl

C) K⁺ and Cl⁻

D) K⁺ and Cl₂

Answer: C. K⁺ and Cl⁻

Q: 2 moles of Na₂SO₄ are dissolved in one dm³of solution Molarity of solution is

A) 1 M

B) 2 M

C) 3 M

D) 0.5 M

Answer: B. 2 M

Q: Molarity is the number of moles of solute dissolved in

A) 1 kg of solvent

B) 1 kg of solution

C) 1 dm³ of solvent

D) 1 dm³ of solution

Answer: D. 1 dm³ of solution

Q: The molarity of a NaOH solution by dissolving 4 g of it in 250 ml water is

A) 0.4 M

B) 0.8 M

C) 0.2 M

D) 0.1 M

Answer: A. 0.4 M