Question

(iv) The chemical formula of aluminium sulphate is –

(a) 4

(b) (4)3

(c) 2(4)3

(d) 34

(v) The long form of the periodic table is bases on –

(a) molecular masses (b) atomic mass

(b) atomic numbers (d) mass numbers

(c) a) Define the following terms - (2)

i) Ionisation potential

ii) Electron affinity

b) An element has the atomic number 16. State (3)

i) The period to which its belongs.

ii) The number of valence electrons in its atom.

iii) Whether it is a metal or non-metal.

(d) Give reasons for the following :- (5)

i) Ionisation potential of the element increases across a period.

ii) Alkali metals are good reducing agent.

(e) Match the Column A with Column B – (5)

Column A Column B

i) Sodium Chloride (a) Increases

ii) Ammonium ion (b) Covalent bond

iii) Electro negativity across (c) Ionic bond

the period

iv) Non-Metallic character (d) Covalent and Coordinate

down the group bond.

v) Carbon tetra chloride (e) Decrease.

Answer as follows.

i) Correct item from B Matching Sodium Chloride

ii) Correct item from B matching ammonium ion and so on.

(f) Name an acid used - (5)

a) to flavour and preserve food​

Answer 1

Answer:

The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn).