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(D) The molecular mass of organic compounds can be determined by various methods: $1$. $Silver \ salt \ method$: Used for determining the equivalent m

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(D) The molecular mass of organic compounds can be determined by various methods: $1$. $Silver \ salt \ method$: Used for determining the equivalent mass of organic acids. $2$. $Chloroplatinate \ salt \ method$: Used for determining the molecular mass of organic bases. $3$. $Mass \ spectrometry$: $A$ powerful analytical technique used to measure the mass-to-charge ratio of ions to determine the molecular mass of a compound. Therefore,all the given methods are used for determining the molecular mass of organic compounds.

Column $-I$	Column $-II$
$(i).$ Lassaigne's test	$(a).$ By sodium peroxide
$(ii).$ Test for nitrogen	$(b).$ Acidify with acetic acid
$(iii).$ Test for sulphur	$(c).$ Acidify with conc. sulphuric acid
$(iv).$ Test for phosphorus	$(d).$ Fusion with sodium

Name the methods used for determining the molecular mass of organic compounds.

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