JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The number of molecules and moles in \(2.8375\) litres of \(O _2\) at STP are respectively
- A \(7.527 \times 10^{22}\) and \(0.250\,mol\)
- B \(1.505 \times 10^{23}\) and \(0.250\,mol\)
- C \(7.527 \times 10^{23}\) and \(0.125\,mol\)
- D \(7.527 \times 10^{22}\) and \(0.125\,mol\)
Answer & Solution
Correct Answer
(D) \(7.527 \times 10^{22}\) and \(0.125\,mol\)
Step-by-step Solution
Detailed explanation
Number of moles of \(O _2=\frac{2.8375}{22.7}=0.125\) Number of molecules \(=0.125\,N _{ A }\) \(=7.525 \times 10^{22}\)
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
- In the following sequence of reactions the maximum number of atoms present in molecule '\(C\)' in one plane is \(A \xrightarrow[ { Cu\; tube }]{\text { Redhot }}\mathrm{B} \xrightarrow[ Anhydrous AlCl_3]{\mathrm{CH}_{3} \mathrm{Cl}(1 \mathrm{eq}} \mathrm{C}\) (\(A\) is a lowest molecular weight alkyne)JEE Mains 2020 Hard
- Consider the following sequence of reactions.
Total number of \(\mathrm{sp}^3\) hybridised carbon atoms in the major product C formed is ________.JEE Mains 2025 Hard - In an acid -base titration, \(0.1\, M\, HCl\) solution was added to the \(NaOH\) solution of unknown strength. Which of the following correctly shows the change of \(pH\) of the titration mixture in this experiment?
JEE Mains 2019 Medium - In the presence of peroxide, \(HCl\) and \(HI\) do not give anti-Markownikoff's addition of alkenes becauseJEE Mains 2014 Hard
- A \(10\,g\) effervescent tablet containing sodium bicarbonate and oxalic acid releases \(0.25\,ml\) of \(CO_2\) at \(T = 298.15\,K\) and \(p = 1\,bar\). If molar volume of \(CO_2\) is \(25.0\,L\) under such condition, what is the percentage of sodium bicarbonate in each tablet? [Molar mass of \(NaHCO_3 = 84\,g\,mol^{-1}\) ]JEE Mains 2019 Hard
- The correct order of ionic radii for the ions, \(\mathrm{P}^{3-}, \mathrm{S}^{2-}\) \(\mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Cl}^{-}\)is :JEE Mains 2021 Easy
More PYQs from JEE Mains
- Xg of benzoic acid on reaction with aq \(\mathrm{NaHCO}_3\) released \(\mathrm{CO}_2\) that occupied 11.2 L volume at STP.
X is _____ g.JEE Mains 2025 Easy - Let one end of a focal chord of the parabola \( y^{2}=16x \) be (16, 16). If \( P(\alpha,\beta) \) divides this focal chord internally in the ratio 5 : 2 then the minimum value of \( \alpha+\beta \) is equal to :JEE Mains 2026 Medium
- The angle of elevation of the summit of a mountain from a point on the ground is \(45^{\circ}\). After climding up one \(km\) towards the summit at an inclination of \(30^{\circ}\) from the ground, the angle of elevation of the summit is found to be \(60^{\circ} .\) Then the height (in \(km\) ) of the summit from the ground isJEE Mains 2020 Hard
- The number of \(f\) electrons in the ground state electronic configuration of \(\mathrm{Np}(\mathrm{Z}=93)\) is ....... .JEE Mains 2021 Easy
- What would be the electrode potential for the given half cell reaction at \(pH = 5\) ? ........... \(\mathrm{V}\) \(2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{\oplus}+4 \mathrm{e}^{-} ; \mathrm{E}_{\mathrm{red}}^{0}=1.23 \mathrm{V}\) \((\mathrm{R}=8.314 \;\mathrm{J} \mathrm{mol}^{-1} \mathrm{K}^{-1} ; \text { Temperature }=298 \;\mathrm{K} ;\) oxygen under std. atm. pressure of \(1 \;bar\))JEE Mains 2020 Hard
- The equivalent capacitance between points \(A\) and \(B\) in below shown figure will be..........\(\mu F\).
JEE Mains 2022 Hard