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Question-1
A ________ bond is formed by the sharing of a pair of electrons.

(A) Single	(B) Double
(C) Triple	(D) Quartet

Question-2
The bonds which are formed by the sharing of an electron pair between two atoms are known as ________ bonds.

(A) Ionic	(B) Covalent
(C) Electrovalent	(D) Co-ordinate

Question-3
Which of the following has the weakest carbon-carbon strength?

(A) C₂H₂	(B) C₂H₄
(C) C₂H₆	(D) all have the same bond strength

Question-4
Saturated hydrocarbons will generally give ________.

(A) Yellow flame	(B) Green flame
(C) Clean flame	(D) Red flame

Question-5
The number of valence electrons in the nitrogen atom is ________.

(A) 1	(B) 3
(C) 5	(D) 7

Question-6
The weak attractive forces present in graphite are called

(A) Gravitational forces	(B) van der Waals forces
(C) Coulombic forces	(D) Repulsive forces

Question-7
COOH group is a __________ functional group.

(A) Aldehyde	(B) Alcohol
(C) Acid	(D) Ketones

Question-8
_________ are most commonly formed by the reaction of an acid and an alcohol.

(A) Esters	(B) Aldehydes
(C) Ketones	(D) Alkanes

Question-9
________ is the first member in the homologous series of alkenes.

(A) Methane	(B) Ethane
(C) Ethene	(D) Ethyne

Question-10
Among the various allotropes of carbon:

(A) Diamond is the hardest and graphite is the softest.	(B) Diamond is the hardest and coke is the softest.
(C) Diamond is the hardest and lamp black is the softest.	(D) Coke is the hardest and graphite is the softest.

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Std 10

CBSE

Practice in Related Chapters
Acids, Bases and Salts
Metals and Non-metals
Periodic Classification of Elements
Carbon and its Compounds
Chemical Reactions and Equations