Chemistry - Study Mode

[#441] The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
Correct Answer

(B) 6.023 x 10 19

Explanation

Solution: The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is 6.023 x 10 19 .

[#442] The most malleable metal is
Correct Answer

(D) gold

Explanation

Solution: The most malleable metal is gold.

[#443] Galvanised iron is made by coating iron with
Correct Answer

(A) Zinc

Explanation

Solution: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

[#444] Slag is a name given for
Correct Answer

(C) Molten alumina

Explanation

Solution: Slag is a partially vitreous by-product of the process of smelting ore, which separates the desired metal fraction from the unwanted fraction. A good example is steelmaking slag: quicklime and magnesite are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.

[#445] Solder is an alloy of
Correct Answer

(C) Tin, lead
(E) Tin and lead

Explanation

Solution: Solder is an alloy of Tin and Lead.