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Chemistry

Chemistry
Vinegar made by fermentation from cane sugar contains

Lactic acid
Acetic acid
Citric acid
Palmitic acid

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Chemistry
Soap helps in better cleaning of clothes because

It absorbs the dirt
It gives strength to solution
Soap acts like catalyst
It reduces the surface tension of solution

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Chemistry
Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium

A and C
B, D and E
A, C and E
A, B, C, D and E

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Chemistry
Which of the following chemicals is used in photography ?

Potassium nitrate
Silver bromide
Sodium chloride
Aluminium hydroxide

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Chemistry
What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper ?

There is a violent explosion.
The paper ignites
There is no reaction.
There is a crackling sound

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Chemistry
The green colour seen in firework displays is due to the chloride salt of :

Sodium
Strontium
Barium
Calcium

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