Some Chemical Reactions MCQs with Answers

The second step in the origin of life must have involved the formation of polypeptides from small organic molecules by _?

• A.Oxidation
• B.Condensation
• C.Hydrolysis
• D.Polymerization

The process of separation of an insoluble solid from a liquid by passing it through filter paper is called?

• A.Filtration
• B.Distillation
• C.Evaporation
• D.Decantation

If molar concentration of a reactant "A" is one, then rate of the reaction of "A" will be ?

• A.Equal to rate constant
• B.Half of the rate constant
• C.Double the rate constant
• D.Independent of rate constant

Which process is used for purifying a solid?

• A.Distillation
• B.Evaporation
• C.Filtration
• D.Sublimation

Boiling of dilute HCl acid does not increase its concentration beyond 22 percent because HCl acid:

• A.Reacts with water to form a different compound
• B.Decomposes at higher concentration
• C.Evaporates completely on heating
• D.Forms a constant boiling mixture

Alkyl halides react with Lithium dialkyl copper reagents to give _?

• A.Alkyl halides (same)
• B.Alkenes
• C.Alcohols
• D.Alkanes

Why is the oxygen-hydrogen absorption of CH3OH such a broad band in the infrared?

• A.Hydrogen bonding broadens the absorption
• B.Presence of a methyl group causes broadening
• C.Carbon-oxygen stretching overlaps the band
• D.Low molecular weight causes broadening

Arrhenius equation relates?

• A.ΔG, ΔH, ΔS
• B.P, V, n
• C.k, Ea, T
• D.q, m, c

In an acidic medium, bromophenol blue is yellow and in a basic medium, it is ?

• A.Red
• B.Green
• C.Blue
• D.Colourless

Which one of the following statements is false about dynamic equilibrium?

• A.The rate of forward reaction equals the rate of reverse reaction
• B.Equilibrium cannot be disturbed by any external stress
• C.The concentrations of reactants and products remain constant
• D.It can only be achieved in a closed system