Select the correct answer from the choice in brackets
The isomer of pentane which has '1' C atom attached to '4' other C atoms [n- / iso- / neo-1 pentane]. 

Select the correct answer from the choice in brackets The IUPAC name of methyl acetylene. [1-butyne / propyne / ethyne]

Select the correct answer from the choice in brackets The functional group in ethanoic acid. [aldehydic / carboxyl/ hydroxyl]

Select the correct answer from the choice in brackets The vapour density of the fifth member of the homologous series of alkanes. [22/36/29]

Select the correct answer from the choice in bracket to complete each sentence. A change in which matter undergoes a change but the total mass of substance is unaltered is a - [physical/ chemical] change.

Select the correct answer from the choice in bracket to complete each sentence. Matter is added or removed during a - [chemical/physical] change

Select the correct answer from the choice given in brackets : The solution which contains both molecules & ions on dissociation of the same. (sodium nitrate, sodium carbonate, sodium hydroxide]

Select the correct answer from the choice in bracket to complete each sentence: The gas which has now replaced hydrogen in air balloons is _____________[argon, helium, neon].

Select the correct answer from the choice in bracket to complete each sentence:- An element 'X' has six electrons in its outer or valence shell. Its valency is _________ [+2/-2/-1].

Select the correct answer from the choice in bracket to complete each sentence. A change in which a substance retains its identity is a — [physical/chemical] change

Select the correct answer from the choice in bracket to complete each sentence: The reactive element from the two monoatomic elements is _______ [neon/silicon].