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Science True-False [Che-1M]

Carbon and its Compounds · CBSE STD 10 (CBSE - English Medium). 6 questions.

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True-False [Che-1M]

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6 questions · timed · auto-graded

Question 11 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.
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Question 21 Mark
The IUPAC name of CH3-CH2-CH2-CH3 is pentane. [True/ False]
Answer
True.
Explanation:
IUPAC name  CH3-CH2-CH2-CH3  of this compound is n-pentane.
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Question 31 Mark
State whether the following statement is true or false:
The minimum number of carbon atoms in a ketone molecule is two.
Answer
False.
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Question 41 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.

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Question 51 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.
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Question 61 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.
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True-False [Che-1M] - Science STD 10 Questions - Vidyadip