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Chemistry

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

Gold
Copper
Silver
Sodium

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Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Sommerfeld
Thomson
Hund
Rutherford

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Chemistry
What is 'milk of magnesia' chemically?

Magnesium carbonate
Magnesium hydroxide
Sodium bicarbonate
Calcium hydroxide

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Chemistry
Vinegar is ________ .

Glacial formic acid
Glacial acetic acid
Diluted acetic acid
Diluted formic acid

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Chemistry
The lowest layer of earth's atmosphere is

Ionosphere
Stratosphere
Mesosphere
Troposphere

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Chemistry
Which of the following is not present in German-silver?

Zinc
Silver
Copper
Nickel

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