General Chemistry Quiz

The smallest particle into which an element can be divided and still be the same substance is called _____.

• Molecule

• Atom

• Electron

• Neutron

Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood

• (i) and (ii)

• (ii) and (iii)

• (iii) and (iv)

• (i) and (iv)

Match the following:

• i)-A, ii)-B, iii)-D, iv)-C

• i)-B, ii)-A, iii)-C, iv)-D

• i)-B, ii)-D, iii)-A, iv)-C

• i)-A, ii)-D, iii)-C, iv)-B

An element has mass number 39 and atomic number 19. What are the number of protons present in the element?

• 39

• 19

• 20

• None of the above

Inert gases have their valency=0.

• True

• False

In the equation:

3Fe + XH₂O ↔ Y + 4H₂

The values of X and Y are:

• 3 and Fe₂O₃

• 3 and Fe₃O₄

• 4 and Fe₂O₃

• 4 and Fe₃O₄

An atom of an element has two shells and both are completely filled, what would be the atomic number of that element?

• 10

• 14

• 20

• 16

The pH of a few common substances were measured and noted as above.

Which option lists the substances from least to most acidic?

• Battery acid, Soft drinks, Human saliva, Lime water

• Soft drinks, Human saliva, Battery acid, Lime water

• Lime water, Battery acid, Human saliva, Soft drinks

• Lime water, Human saliva, Soft drinks, Battery acid

When a piece of magnesium metal is added to dilute hydrochloric acid in a test tube, fizzing occurs and hydrogen gas is released from the mixture. What would happen to the burning splinter brought near the mouth of the test tube?

• Will get extinguished

• Will rekindle

• Will go off with a pop sound

• None of the above

Which of the following statements is true about A and B?

• A and B are isotopes

• A and B are isobars

• Both isotopes and isobars

• None of the above