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JEE Main 2023 (Online) 12th April Morning Shift
Numerical
+4
-1
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Values of work function (W$$_0$$) for a few metals are given below

Metal Li Na K Mg Cu Ag
W$$_0$$/eV 2.42 2.3 2.25 3.7 4.8 4.3

The number of metals which will show photoelectric effect when light of wavelength $$400 \mathrm{~nm}$$ falls on it is ___________

Given: $$\mathrm{h}=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$$

$$c=3 \times 10^{8} \mathrm{~ms}^{-1}$$

$$e=1.6 \times 10^{-19} \mathrm{C}$$

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2
JEE Main 2023 (Online) 12th April Morning Shift
Numerical
+4
-1
Out of Syllabus
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At $$600 \mathrm{~K}$$, the root mean square (rms) speed of gas $$\mathrm{X}$$ (molar mass $$=40$$ ) is equal to the most probable speed of gas $$\mathrm{Y}$$ at $$90 \mathrm{~K}$$. The molar mass of the gas $$\mathrm{Y}$$ is ___________ $$\mathrm{g} ~\mathrm{mol}^{-1}$$. (Nearest integer)

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3
JEE Main 2023 (Online) 12th April Morning Shift
Numerical
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Three organic compounds A, B and $$\mathrm{C}$$ were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The $$\mathrm{R}_{\mathrm{f}}$$ value of the most polar compound is ____________ $$\times 10^{-2}$$

JEE Main 2023 (Online) 12th April Morning Shift Chemistry - Basics of Organic Chemistry Question 41 English

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4
JEE Main 2023 (Online) 12th April Morning Shift
Numerical
+4
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JEE Main 2023 (Online) 12th April Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 22 English

The value of $$x$$ in compound 'D' is _________.

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