JEE Mains · Chemistry · STD 11 - 9. Hydricarbon
Number of hydrogen atoms per molecule of a hydrocarbon A having \(85.8 \%\) carbon is \(...............\).(Given : Molar mass of \(A =84\,g\,mol ^{-1}\) )
- A \(13\)
- B \(14\)
- C \(15\)
- D \(12\)
Answer & Solution
Correct Answer
(D) \(12\)
Step-by-step Solution
Detailed explanation
Element Percentage Mole Mole ratio \(C\) \(85.8\) \(\frac{85.8}{12}=7.15\) \(1\) \(H\) \(14.2\) \(\frac{14.2}{1}=14.2\) \(2\) Empirical formula \(\left( CH _2\right)\) \(14 \times n=84\) \(n =6\) \(\therefore\) Molecular formula \(C _6 H _{12}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- The enthalpy of combustion of propane, graphite and dihydrogen at \(298\,K\) are: \(-2220.0\,kJ\,mol ^{-1}\), \(393.5\,kJ mol ^{-1}\) and \(-285.8\,kJ\,mol ^{-1}\) respectively. The magnitude enthalpy of formation of propane \(\left( C _{3} H _{8}\right)\) is......... \(kJ\,mol\,{ }^{-1}\). (Nearest integer)JEE Mains 2022 Medium
- Production of iron in blast furnace follows the following equation \(Fe _{3} O _{4}( s )+4 CO ( g ) \rightarrow 3 Fe ( l )+4 CO _{2}( g )\) when \(4.640 \,kg\) of \(Fe _{3} O _{4}\) and \(2.520 \,kg\) of \(CO\) are allowed to react then the amount of iron (in \(g\) ) produced is \(....\) [Given : Molar Atomic mass \(\left( g\, mol ^{-1}\right): Fe =56\) Molar Atomic mass \(\left( g \,mol ^{-1}\right): 0=16\) Molar Atomic mass \(\left( g\, mol ^{-1}\right):= C =12\)JEE Mains 2022 Hard
- A sample of \(4.5\,mg\) of an unknown monohydric alcohol, \(R - OH\) was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be \(3.1\,mL\). The molecular weight of the unknown alcohol is \(g / mol\). [Nearest integer]JEE Mains 2022 Hard
- Which of the following statements about \(Na_2O_2\) is not correctJEE Mains 2014 Medium
- The volume of \(0.1\, N\) dibasic acid sufficient to neutralize \(1\, g\) of a base that furnishes \(0.04\, mole\) of \(OH^-\) in aqueous solution is ............ \(\mathrm{mL}\)JEE Mains 2016 Hard
- The cell potential for the following cell \(Pt \left| H _{2}( g )\right| H ^{+}( aq ) \| Cu ^{2+}(0.01 M ) \mid Cu ( s )\) is \(0.576 \,V\) at \(298\, K\). The \(pH\) of the solution is \(......\,.\) (Nearest integer)JEE Mains 2022 Medium
More PYQs from JEE Mains
- 7.9 MeV \( \alpha \)-particle scatters from a target material of atomic number 79. From the given data the estimated diameter of nuclei of the target material is (approximately) __________m.
\(\left[\frac{1}{4 \pi \epsilon_0}=9 \times 10^9 Nm ^2 / C ^2\right.\) and electron charge \(\left.=1.6 \times 10^{-19} C \right]\)JEE Mains 2026 Medium - Among \((a) - (d)\) the complexes that can display geometrical isomerism are \((a)\) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right]^{+}\) \((b)\) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{5}\right]^{-}\) \((c)\) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]\) \((d)\) \(\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{ClBr}\right]^{2+}\)JEE Mains 2020 Hard
- When an electric current is passes through acidified water, \(112\,mL\) of hydrogen gas at \(N. T.P\). was collected at the cathode in \(965\,seconds\). The current passed, in ampere, isJEE Mains 2018 Hard
- The \(IUPAC\) name of the following compound is
JEE Mains 2019 Hard - A compressive force, \(F\) is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temperature increases by \(\Delta T\). The net change in its length is zero. Let \(l\) be the length of the rod, \(A\) its area of cross- section, \(Y\) its Young's modulus, and \(\alpha \) its coefficient of linear expansion. Then, \(F\) is equal toJEE Mains 2017 Medium
- A satellite is launched into a circular orbit of radius ' R ' around the earth. A second satellite is launched into an orbit of radius 1.03 R . The time period of revolution of the second satellite is larger than the first one approximately byJEE Mains 2025 Medium