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Chemistry

Chemistry
Litmus is obtained from

Lichen
An alga
A bacterium
A fungus

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Chemistry
The main buffer system of the human blood is

NH2CONH2 - NH2CONH+
H2CO3 - HCO3
CH3COOH - CH3COO-
H2CO3 - CO32-

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Chemistry
Poison used for killing rats is

Magnesium phosphide (Mg3P2)
Zinc phosphide (Zn3P2)
Magnesium nitride (Mg3N2)
Calcium phosphide (Ca3P2)

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Chemistry
Which of the following is not a gaseous air pollutant?

Smoke
Oxides of nitrogen
Hydrocarbon
Oxides of sulphur

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Chemistry
The minimum energy required for an effective collision is

Internal energy
Threshold energy
Free energy
Activation energy

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Chemistry
Which of the following statements are correct about chloroform? a. Liquid fuel b. Anaesthetic in nature c. Produces phosgene d. Fire extinguisher

A, b
B, c
D, a
A, c

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