Page 2 - 2.PRACTICE WORKSHEET

DIRECTION:Each of these questions contains an Assertion followed by Reason. Read them
carefully and answer the question on the basis of following options. You have to select the one
that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.

(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
Q.5 Assertion: One atomic mass unit (amu) is mass of an atom equal to exactly one-
twelfth the mass of a carbon-12 atom.
Reason: Carbon-12 isotope was selected as standard.
Q.6 Assertion: Atom is electrically neutral.
Reason: A neutral particle, neutron is present in the nucleus of atom.
Q.7 Write the symbols of the following elements
a) Sodium
b) Aluminium
c) Gold
d) Silver
Q.8 Write the symbols of the following ions:

a) Aluminium
b) Sulphate

c) Cuprous
d) Acetate

Q.9 Write two points of difference between

a) Atoms and ions
b) Cations and anions

Q.10 Write the valencies of the following ions

a) Nitrite ion

b) Bicarbonate ion

c) Sulphite ion

d) Ferric ion