JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The number of atoms in \(8\, \mathrm{~g}\) of sodium is \(\mathrm{x} \times 10^{23}.\) The value of \(\mathrm{x}\) is ...... .(Nearest integer) \(\left[\right.\) Given \(: \mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23}\, \mathrm{~mol}^{-1}\), Atomic mass of \(\mathrm{Na}=23.0\, \mathrm{u}]\)
- A \(6\)
- B \(8\)
- C \(2\)
- D \(34\)
Answer & Solution
Correct Answer
(C) \(2\)
Step-by-step Solution
Detailed explanation
\(\text { No. of atoms }=\frac{8}{23} \times 6.02 \times 10^{23}= 2.09 \times 10^{23}\) \(\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\simeq 2 \times 10^{23}\)…
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
- A mixture containing the following four compounds is extracted with \(1 \,M\, HCl\). The compound that goes to aqueous layer is
JEE Mains 2017 Hard - The ionic radii of \(\mathrm{F}^{-}\) and \(O^{2-}\) respectively are \(1.33\, A^o\) and \(1.4\, A^o\), while the covalent radius of \(\mathrm{N}\) is \(0.74\,A^o\) The correct statement for the ionic radius of \(\mathrm{N}^{3-}\) from the following is :JEE Mains 2021 Hard
- The number of \(2-\) centre \(-2-\) electron and \(3-\) centre \(-2-\) electron bonds in \(B_2H_6\), respectively, areJEE Mains 2019 Hard
- Which of the following complexes will show geometrical isomerism?JEE Mains 2018 Hard
- In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass \( 32 \, g \, mol^{-1} \)). Molar mass of barium sulphate is \( 233 \, g \, mol^{-1} \).JEE Mains 2026 Easy
- The value of Rydberg constant \(\left(R_H\right)\) is \(2.18 \times 10^{-18} \mathrm{~J}\). The velocity of electron having mass \(9.1 \times 10^{-31} \mathrm{~kg}\) in Bohr's first orbit of hydrogen atom = _______ \(\times 10^5 \mathrm{~ms}^{-1}\) (nearest integer)JEE Mains 2024 Medium
More PYQs from JEE Mains
- A uniform disc with mass \(M=4\,kg\) and radius \(R=\) \(10\,cm\) is mounted on a fixed horizontal axle as shown in figure. A block with mass \(m =2\,kg\) hangs from a massless cord that is wrapped around the rim of the disc. During the fall of the block, the cord does not slip and there is no friction at the axle. The tension in the cord is_______ \(N\) \(\left(\right.\) Take \(\left.g =10\,ms ^{-2}\right)\)
JEE Mains 2022 Hard - A tennis ball (treated as hollow spherical shell) starting from \(O\) rolls down a hill. At point \(A\) the ball becomes air borne leaving at an angle of \(30^o\) with the horizontal. The ball strikes the ground at \(B\). What is the value of the distance \(AB\) ? (Moment of inertia of a spherical shell of mass \(m\) and radius \(R\) about its diameter .......... \(m\). \(= \frac {2}{3}\,mR^2\))
JEE Mains 2013 Hard - The slope of normal at any point \((x, y), x > 0, y > 0\) on the curve \(y=y(x)\) is given by \(\frac{x^{2}}{x y-x^{2} y^{2}-1}\) If the curve passes through the point \((1,1)\), then e. \(y(e)\) is equal toJEE Mains 2022 Hard
- Number of compounds from the following which cannot undergo Friedel-Crafts reactions is _______.
[toluene, nitrobenzene, xylene, cumene, anline, chlorobenzene, \(m\)-nitroaniline, \(m\)-dinitrobenzene]JEE Mains 2024 Medium - If the domain of the function
\(f(x)=\log _e\left(\frac{2 x-3}{5+4 x}\right)+\sin ^{-1}\left(\frac{4+3 x}{2-x}\right) \quad \text { is } \quad[\alpha, \beta)\)
then \(\alpha^2+4 \beta\) is equal toJEE Mains 2025 Medium - If the sum of the deviations of \(50\) observations from \(30\) is \(50\), then the mean of these observations isJEE Mains 2019 Hard