ChemQuest 2025

In which bond are electrons transferred?

• Double bond

• Covalent bond

• Ionic

• None

• What is the process of a substance changing directly from a solid to a gas called?

• Fusion

• Sublimation

• Vaporization

• Condensation

Total number of naturally occurring elements

• 74

• 108

• 118

• 94

Most of the deodorants contain aluminium salts because

they

• act as antiperspirants

• act as anti-bacterial agents

• mask body odour

• All the these

Which of the following elements behave as semiconductors as pure elements ?

1) Silicone 2) Germanium 3) Gallium

• both 2 and 3

• both 1 and 2

• only 3

• only 2

The equivalent weight of KMnO4

in acidic and neutral

medium respectively are:

• M/5 and M/3

• M/3 and M/5

• M/5 and M/2

• M/2 and M/3

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4

solution in the presence of H2SO4.

The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

• gets oxidised by oxalic acid to chlorine

• furnishes H+

  ions in addition to those from oxalic acid

• Oxidises oxalic acid to carbon dioxide and water

• reduces permanganate to

  Mn2+

MgSO4 on reaction with NH4OH and Na2HPO4 forms a white crystalline precipitate. What is the formula?

• Mg(NH4)PO4

• Mg3(PO4)2

• MgCl2, MgSO4

• MgSO4

Which of the following is used in Paints?

• Terylene

• Nylon

• Glyptal

• Chloroprene

Cod Liver oil is

• fat dispersed in water

• water dispersed in fat

• water dispersed in oil

• fat dispersed in fat