1
Q:

# In addition to nitric acid, another acid which may render iron passive is

 A) acetic acid B) oxalic acid C) chromic acid D) citric acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide $\inline Fe_{3}O_{4}$on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.

Subject: Chemistry
Q:

Which one of the following is a natural colloid ?

 A) Cane sugar solution B) Blood C) Sodium chloride solution D) Urea solution

Explanation:

Filed Under: Chemistry
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1 3
Q:

All of the following are constituents of RNA molecule except _____

 A) Thymine B) Adenine C) Uracil D) Guanine

Explanation:

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Exam Prep: AIEEE

7 87
Q:

ATP stands for -

 A) Adenosine triphosphate B) Alanine triphosphate C) Adrenalin triphosphate D) Asparagine triphosphate

Explanation:

Adenosine triphosphate (ATP) is a nucleotide which is also called as nucleoside triphosphate is a small molecule used in cells as a coenzyme. It is often referred to as the "molecular unit of currency" of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. Most of the cellular functions need energy in order to be carried out such as synthesis of proteins, synthesis of membranes, movement of the cell, cellular division, transport of various solutes etc. The ATP is the molecule that carries energy to the place where the energy is needed. When ATP breaks into ADP (adenosine diphosphate) and Pi (phosphate), the breakdown of the last covalent link of phosphate liberates energy that is used in reactions where it is needed.

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13 185
Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

 A) Hydrogen sulphide B) Oxygen C) Nitrogen D) Carbon dioxide

Explanation:

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8 410
Q:

Which of the following is a non metal that remains liquid at room temperature  ?

 A) Chlorine B) Phosphorous C) Bromine D) Helium