Noble gases belong to group ___________

(a)

14

(b)

15

(c)

17

(d)

18

Arrange the following in the increasing order of the size. Cl^-, Cl, Cl⁺

(a)

Cl^- < Cl⁺ < Cl

(b)

Cl₄ < Cl^- < Cl⁺

(c)

Cl⁺ < Cl < Cl^-

(d)

Cl⁺ < Cl < Cl^-

Electronegativity values are based on ______________

(a)

bond energy

(b)

electron affinity

(c)

ionisation energy

(d)

all the above

Slag is.

(a)

Metal + Ore

(b)

Ore + Gangue

(c)

Flux + Gangue

(d)

Ore + Flux

The chemical formula of sodium meta aluminate is ___________

(a)

NaAlO₂

(b)

Na₂AlO₂

(c)

NaAl₂O₂

(d)

Na₂Al₂O₃

Define atomic radius.

Define metallic radius.

What does the term "ion" mean?

Define the term Ionic Radii.

Explain the salient features of periods in the modern periodic table.

Explain the salient features of groups in the modern periodic table.

How is Bauxite ore concentrated?

Explain the types of corrosion.

Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A, B and C with reactions. (or) Metal belongs to 3rd period and 13th group in the modern periodic table of elements. A reacts with steam in red hot condition to form compound B. A also reacts with strong alkali (NaOH) to form conpound C. Find A, B and C. Write appropriate balance chemical equations.

Name the acid that renders aluminium passive. Why?

a) Identify the bond between H and F in HF molecule.
b) What property forms the basis of identification?
c) How does the property vary in periods and in groups?