Chemistry - Study Mode

[#851] The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
Correct Answer

(C) levigation

Explanation

Solution: Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

[#852] The inert gases are ____ in water.
Correct Answer

(A) sparingly soluble

Explanation

Solution: The inert gases are sparingly soluble in water.

[#853] The molecular formula of phosphorous is
Correct Answer

(D) P 4

Explanation

Solution: The molecular formula of phosphorous is P 4 .

[#854] The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
Correct Answer

(C) periodic table of contents

Explanation

Solution: They are associated with the development of periodic table of elements. Newland gave the Newland's law of octaves. Mendeleev gave the period law based on atomic mass. Moseley gave the modern period law based on atomic number.

[#855] The chief constituent of vinegar is
Correct Answer

(B) Acetic acid

Explanation

Solution: The main constituent of Vinegar is acetic acid. It consists of about 5–20% acetic acid (CH 3 COOH), water, and other trace chemicals.