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Chemistry

Chemistry
Interveinal necrotic spots on leaves appear due to

HF injury
O3injury
SO2injury
NO2injury

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Chemistry
The most electropositive elements among the following is

Cs
Na
Ca
K

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Chemistry
24 carat of diamond is equal to

91% gold
95% mg
200 mg
200 g

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Chemistry
Which one of the following elements exhibits the greatest tendency to lose electrons ?

Zinc
Lithium
Fluorine
Oxygen

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Chemistry
An emulsifier is an agent which

Accelerates the dispersion
Homogenises an emulsion
Stabilises an emulsion
Aids the flocculation of an emulsion

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Chemistry
Among the following, which is always found in free-state in nature?

Silver
Sodium
Gold
Copper

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