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Chapter 8: Problem 28
Hardened steel on heating in the range of \(220^{\circ} \mathrm{C}\) to \(330^{\circ} \mathrm{C}\) and on slow cooling gives (a) hard steel (b) brittle steel (c) hard and brittle steel (d) hard and tough steel
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An organic compound contains \(40 \%\) carbon and \(6.67 \%\) hydrogen by mass. Which of the following represents the empirical formula of the compound? (a) \(\mathrm{CH}_{2}\) (b) \(\mathrm{CH}_{2} \mathrm{O}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}\) (d) \(\mathrm{CH}_{3} \mathrm{O}\)
A volume of \(10 \mathrm{ml}\) of an oxide of nitrogen was taken in a eudiometer tube and mixed with hydrogen until the volume was \(28 \mathrm{ml} .\) On sparking, the resulting mixture occupied \(18 \mathrm{ml}\). To this mixture, oxygen was added when the volume came to \(27 \mathrm{ml}\) and on explosion again, the volume fall to \(15 \mathrm{ml}\). Find the molecular weight of the oxide of nitrogen originally taken in eudiometer tube. All measurements were made at STP.
The explosion of a mixture consisting of one volume of a gas being studied and one volume of \(\mathrm{H}_{2}\) yielded one volume water vapour and one volume of \(\mathrm{N}_{2}\). The formula of gas being studied, is (a) NO (b) \(\mathrm{NO}_{2}\) (c) \(\mathrm{N}_{2} \mathrm{O}\) (d) \(\mathrm{N}_{2} \mathrm{O}_{3}\)
One mole of a mixture of \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\) requires exactly \(20 \mathrm{~g}\) of \(\mathrm{NaOH}\) in solution for complete conversion of all the \(\mathrm{CO}_{2}\) into \(\mathrm{Na}_{2} \mathrm{CO}_{3} .\) How many grams more of \(\mathrm{NaOH}\) would it require for conversion into \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) if the mixture (one mole) is completely oxidized to \(\mathrm{CO}_{2} ?\) (a) \(60 \mathrm{~g}\) (b) \(80 \mathrm{~g}\) (c) \(40 \mathrm{~g}\) (d) \(20 \mathrm{~g}\)
At room temperature, the molar volume of hydrogen fluoride gas has a mass of about \(50 \mathrm{~g}\). The formula weight of hydrogen fluoride is 20 . Gaseous hydrogen fluoride at room temperature is therefore, probably a mixture of (a) \(\mathrm{H}_{2}\) and \(\mathrm{F}_{2}\) (b) \(\mathrm{HF}\) and \(\mathrm{H}_{2} \mathrm{~F}_{2}\) (c) \(\mathrm{HF}\) and \(\mathrm{H}_{2, s} \mathrm{~F}_{2.5}\) (d) \(\mathrm{H}_{2} \mathrm{~F}_{2}\) and \(\mathrm{H}_{3} \mathrm{~F}_{3}\)
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