Chemistry Quiz 27 (20 MCQs)

Quiz Instructions

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1. Two or more elements that combine chemically.

Correct Answer: C) Compound.

2. An atom has 23 protons and 29 neutrons. Which is the correct isotope for this atom?

Correct Answer: D) Vanadium-52.

3. Which pair of formulas represents two compounds that are electrolytes?

Correct Answer: B) HCl and KOH.

4. What subatomic particle has a negative charge?

Correct Answer: C) Electron.

5. A mole of Lithium is ..... to a mole of Carbon.

Correct Answer: B) Equal to.

6. A substance that is made up for one type of atom is called an

Correct Answer: B) Element.

7. The gas used for artificial ripening of green fruit is?

Correct Answer: B) Ethylene.

8. It is a number of protons inside the nucleus of an atom.

Correct Answer: C) Atomic number.

9. The ability of a metal to allow heat or electricity to pass through it.

Correct Answer: A) Conductivity.

10. Which of the following elements behave chemically both as a metal and a non metal?

Correct Answer: A) Boron.

11. Mass of 2 Moles of H2O is

Correct Answer: C) 36g.

12. Positively charged particles found in the nucleus of an atom

Correct Answer: B) Proton.

13. What word describes when a molecule is not attracted to water?

Correct Answer: A) Hydrophobic.

14. How many formula units (molecules) are in 1 mole of NaCl?

Correct Answer: A) 6.02 x 1023.

15. Bleaching action of chlorine is by

Correct Answer: D) Decomposition.

16. Discovered the Electrons .....

Correct Answer: C) JJ Thompson.

17. To get salt out of a solution, we could use .....

Correct Answer: B) Distillation.

18. Rate of chemical reaction means

Correct Answer: B) Speed of reaction.

19. Which pH indicates an alkaline solution?

Correct Answer: A) 10.

20. It cannot be simplied

Correct Answer: D) Elements.