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Class VII >> Science >> Acids, Bases and Salts >> A1

Q1	Litmus is extracted from __________.
A	Lichens
B	Fungi
C	Algae
D	Bryophyta

Q2	In neutralization reaction __________.
A	Heat is not Evolved
B	Heat is Evolved
C	Heat is Absorbed
D	Neither Heat is Evolved nor Released.

Q3	Ant sting is __________ in nature.
A	Acidic
B	Basic
C	Neutral
D	Salt

Q4	Acids that occur naturally in plants and animal material are called __________.
A	Dilute Acids
B	Concentrated Acids
C	Organic Acids
D	Mineral Acids

Q5	What is the colour change of the litmus in Acidic Solution?
A	Blue to Red
B	Red To Blue
C	Yellow to Reddish Brown
D	Light Pink to Magenta

Q6	Which acid is present in tomato?
A	Tartaric Acid
B	Oxalic Acid
C	Acetic Acid
D	Hydrochloric Acid

Q7	The characteristics of acid are __________.
A	Sour in Taste
B	Bitter in Taste
C	Turns Blue Litmus Paper into Red
D	Both (A) and (C)

Q8	Sodium chloride turns __________.
A	No Change in Colour of Litmus
B	Methyl Orange to Yellow
C	Blue Litmus to Red
D	Red Litmus To Blue

Q9	__________ is a dye that changes colour with an acid or a base.
A	Salt
B	An Indicator
C	Baking Powder
D	A Hydrated Salt

Q10	Substances which are bitter in taste, feel soapy on touching are known as __________.
A	Acids
B	Bases
C	Indicators
D	Neutral solution

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