Number of free electron(s) in each carbon of graphite is

(a)

one

(b)

Two

(c)

Three

(d)

Four

Carbon forms large number of organic compounds due to

(a)

Allotropy

(b)

Isomerism

(c)

Tetravalency

(d)

Catenation

Which of the following does not contain double bond

(a)

CO₂

(b)

C₂H₄

(c)

HCl

(d)

O₂

Raagav brings his lunch every day to school in a plastic container which has resin code number 5. The container is made of

(a)

Polystyrene

(b)

PVC

(c)

Polypropylene

(d)

LDPE

Which of the following plastic items are banned by the Government of Tamil Nadu as of 1st January 2019?

(a)

Plastic sheets

(b)

Plastic tea cups

(c)

Plastic water packets

(d)

All the above

The lead pencil contains

(a)

Graphite

(b)

Diamond

(c)

Lead

(d)

Charcoal

Plastic resin codes are shown as three chasing arrows in a ______________ with a number in the middle or letters (an acronym of that plastic type).

(a)

Logo

(b)

Recycling symbol

(c)

Square

(d)

Triangle

Hydrocarbons on burning in the air give CO₂ and _____________.

(a)

Water and heat

(b)

CO and Heat

(c)

Water and CO

(d)

Water and Sulphur dioxide

In a covalent bond formation

(a)

transfer of electrons takes place

(b)

equal sharing of electrons between two atoms takes place.

(c)

electrons are shared by one atom only.

(d)

electrons are donated by one atom and shared by both atoms.

The thinnest and strongest allotrope of carbon is ______________.

(a)

Graphite

(b)

Fullerene

(c)

Graphene

(d)

Diamond