True-False

Question 11 Mark

State whether the following statement is true or false:
The minimum number of carbon atoms in a ketone molecule is two.

Answer

False.

Question 21 Mark

Ethanol turns blue litmus red. [True/ False]

Answer

False.
Explanation:
Ethanol is an aliphatic alcohol and its pH is almost equal to 7 so it can not turn blue litmus to red.

View full question & answer→

Question 31 Mark

State whether the following statement is true or false:Diamond and graphite are the covalent compounds of carbon element (C).

Answer

False.Explanation:
Diamond and graphite are the allotropic forms of carbon (C) with covalent bonding between different carbon atoms.

View full question & answer→

Question 41 Mark

The IUPAC name of $CH_3-CH_2-CH_2-CH_3$ is pentane. [True/ False]

Answer

True.
Explanation:
IUPAC name $CH_3-CH_2-CH_2-CH_3$ of this compound is n-pentane.

View full question & answer→

Question 51 Mark

Carbon and its compounds are used as fuels because they burn in air releasing a lot of heat energy. [True/ False]

Answer

True.
Explanation:
A Carbon and its compounds are used as fuels because most of the carbon compounds produce lot of heat and energy when burnt in air i.e. they have high calorific value.

View full question & answer→

Question 61 Mark

The solid and liquid fuels which do not vaporise on heating, burn without producing a flame. [True/ False]

Answer

True.
Explanation:
When the oxygen supply is insufficient, then the fuels burn incompletely producing mainly a yellow flame. Those solid and liquid fuels which do not vaporise on heating, burn without producing a flame. For e.g. Coal, Charcoal.

View full question & answer→

Science True-False

Test yourself on this topic