Which of the following pairs of elements cannot form an alloy ?

• Zn, Cu

• Fe, Hg

• Fe, C

• Hg, Na

Alum is a water purifier because it

• coagulates the impurities

• softens hard water

• gives taste

• destroys the pathogenic bacteria

Ethyl chloride on heating with AgCN forms a compound X. The functional isomer of X is

• C₂H₅NC

• C₂H₅NH₂

• C₂H₅CN

• None of these

20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will

• be neutra

• be basic

• turn phenolphthalein solution pink

• turn methyl orange red

A commercial sample of hydrogen peroxide is labelled as is volume. Its percentage strength is nearly

• 1%

• 3%

• 10%

• 90%

Activated charcoal is used to remove colouring matter from pure substances. It works by

• oxidation

• reduction 

• bleaching

• adsorption

A gas decolourised by KMnO₄ solution but gives no precipitate with ammoniacal cuprous chloride is

• ethane

• methane

• ethene

• acetylene

H₃C-C(Cl) = CH - CH(CH₃) - CH₃

• 2-chloro-4-methyl-2pentene

• 4-chloro-2-methyl-3-pentene

• 4-methyl-2-chloro-2-pentene

• 2-chloro-4,4-dimethyl-2-butene

Amongst the following the compound that can most readily get sulphonated is

• benzene

• toluene

• nitrobenzene

• chlorobenzene

30.

Household gaseous fuel (LPG) mainly contains

• CH₄

• C₂H₂

• C₂H₄

• C₄H₁₀