1
JEE Main 2023 (Online) 12th April Morning Shift
MCQ (Single Correct Answer)
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Out of Syllabus
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In the given reaction cycle

JEE Main 2023 (Online) 12th April Morning Shift Chemistry - s-Block Elements Question 14 English

X, Y and Z respectively are :

A
$$ \begin{array}{lll} \mathrm{X} & \mathrm{Y} & \mathrm{Z} \\ \mathrm{CaCO}_3 & \mathrm{NaCl} & \mathrm{KCl} \end{array} $$
B
$$ \begin{array}{lcl} \mathrm{X} & \mathrm{Y} & \mathrm{Z} \\ \mathrm{CaO} & \mathrm{NaCl}+\mathrm{CO}_2 & \mathrm{NaCl} \end{array} $$
C
$$ \begin{array}{lll} \mathrm{X} & \mathrm{Y} & \mathrm{Z} \\ \mathrm{CaCO}_3 & \mathrm{NaCl} & \mathrm{HCl} \end{array} $$
D
$$ \begin{array}{ccc} \mathrm{X} & \mathrm{Y} & \mathrm{Z} \\ \mathrm{CaO} & \mathrm{NaCl}+\mathrm{CO}_2 & \mathrm{KCI} \end{array} $$
2
JEE Main 2023 (Online) 12th April Morning Shift
Numerical
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In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of $$\mathrm{sp}^{2}$$ hybridised carbons is __________.

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3
JEE Main 2023 (Online) 12th April Morning Shift
Numerical
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-1
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80 mole percent of $$\mathrm{MgCl}_{2}$$ is dissociated in aqueous solution. The vapour pressure of $$1.0 ~\mathrm{molal}$$ aqueous solution of $$\mathrm{MgCl}_{2}$$ at $$38^{\circ} \mathrm{C}$$ is ____________ $$\mathrm{mm} ~\mathrm{Hg.} ~\mathrm{(Nearest} ~\mathrm{integer)}$$

Given : Vapour pressure of water at $$38^{\circ} \mathrm{C}$$ is $$50 \mathrm{~mm} ~\mathrm{Hg}$$

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4
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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