MolSynapsequestion bank

MolSynapse / Question bank / Qualitative Analysis: Anions / Dry tests: heating, flame and borax bead tests

JEE Main levelSingle correct optionDifficulty 2 of 3qa118

Anhydrous copper(II) nitrate is heated until only a black solid remains. Assume every product other than the black solid is a gas. The moles of gaseous products formed per mole of $Cu (NO X_{3}) X_{2}$ decomposed is:

A $1.5$
B $3.0$
C $2.5$
D $2.0$

Answer: C

2 Cu (NO X_{3}) X_{2} 2 CuO + 4 NO X_{2} + O X_{2}

: 2 mol salt gives 4 mol

NO X_{2}

and 1 mol

O X_{2}

, i.e. 5 mol gas. Per mole of salt this is

5/2 = 2.5

mol.

Practice Qualitative Analysis: Anions More on Dry tests: heating, flame and borax bead tests

Previous questionNext question

More questions on Dry tests: heating, flame and borax bead tests