Some Basic Concepts Of Chemistry - Physical Chemistry - Chemistry Previous Year Questions

The mass of \(\mathrm{AgCl}\) precipitated when a solution containing \(11.70 \mathrm{~g}\) of \(\mathrm{NaCl}\) is added to a solution containing \(3.4 \mathrm{~g}\) of \(\mathrm{AgNO}_3\) is [Atomic mass of \(\mathrm{Ag}=108\), Atomic mass of \(\mathrm{Na}=23\)]

A metal exists as an oxide with formula \(M_{0.96}\) O. Metal, \(M\) can exist as \(M^{2+}\) and \(M^{3+}\) in its oxide \(M_{0.96} \mathrm{O}\). The percentage of \(\mathrm{M}^{3+}\) in the oxide is nearly

A gas mixture contains \(25 \% \mathrm{~He}\) and \(75 \% \mathrm{~CH}_4\) by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately _________.

\(0.4 \mathrm{~g}\) of dihydrogen is made to react with \(7.4 \mathrm{~g}\) of dichlorine to form hydrogen chloride. The volume of hydrogen chloride formed at \(273 \mathrm{~K}\) and \(1 \mathrm{~bar}\) pressure is

A pure compound contains \(2.4 \mathrm{~g}\) of \(\mathrm{C}, 1.2 \times 10^{23}\) atoms of \(\mathrm{H}, 0.2\) moles of oxygen atoms. Its empirical formula is

An aqueous solution of alcohol contains \(18 \mathrm{~g}\) of water and \(414 \mathrm{~g}\) of ethyl alcohol. The mole fraction of water is

0.48 g of an organic compound on complete combustion produced 0.22 g of $\mathrm{CO}_2$. The percentage of C in the given organic compound is

Select the INCORRECT statement/s from the following:

(a) 22 books have infinite significant figures

(b) In the answer of calculation $2.5 \times 1.25$ has four significant figures,.

(c) Zero's preceding to first non-zero digit are significant

(d) In the answer of calculation $12.11+18.0+1.012$ has three significant figures

Which of the following methods of expressing concentration are unitless?