Rehearsal Examination Chemistry Gr 12

What is your full name?

What is your father name?

Admission number?

Class and Section

Why the density of K is unusually low?

• because it is alkaline earth metal

• because it is not a metal

• it is more reactive

• because of its unusual increase of atomic size

A metal is thrown in water and picture is showing its reaction with water. This metal should be ____________.

• Al

• Pb

• Na

• Ni

Which of the following metal is metalloid?

• Carbon

• Germanium

• Tin

• Lead

The electronic configuration of an element is given below,

[Ar] 4s² 3d²

Which set of variable oxidation state it can posses?

• 1, 2

• 2, 3

• 2, 3, 4

• 3, 4, 5

What is the color of precipitates formed when NaOH is added to Fe⁺² solution.

• Yellow

• White

• Green

• Brown

This structure of functional group represents _____________ molecules.

• Amine

• Nitrile

• Nitro

• Arene