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JEE Main 2024 (Online) 5th April Morning Shift
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The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is _________

JEE Main 2024 (Online) 5th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 22 English

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2
JEE Main 2024 (Online) 5th April Morning Shift
Numerical
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An artificial cell is made by encapsulating $$0.2 \mathrm{~M}$$ glucose solution within a semipermeable membrane. The osmotic pressure developed when the artificial cell is placed within a $$0.05 \mathrm{~M}$$ solution of $$\mathrm{NaCl}$$ at $$300 \mathrm{~K}$$ is ________ $$\times 10^{-1}$$ bar. (nearest integer).

[Given : $$\mathrm{R}=0.083 \mathrm{~L} \mathrm{~bar} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$ ]

Assume complete dissociation of $$\mathrm{NaCl}$$

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3
JEE Main 2024 (Online) 5th April Morning Shift
Numerical
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In the lewis dot structure for $$\mathrm{NO}_2^{-}$$, total number of valence electrons around nitrogen is _________.

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4
JEE Main 2024 (Online) 5th April Morning Shift
Numerical
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The value of Rydberg constant $$(R_H)$$ 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).

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