(B) Concentration in $ppm = \frac{\text{Mass of solute (in } g)}{\text{Volume of solution (in } mL)} \times 10^{6}$.Given $ppm = 48$,Volume $= 2 \, L

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(B) Concentration in $ppm = \frac{\text{Mass of solute (in } g)}{\text{Volume of solution (in } mL)} \times 10^{6}$.Given $ppm = 48$,Volume $= 2 \, L = 2000 \, mL$.Mass of $Mg = \frac{48 \times 2000}{10^{6}} = 96 \times 10^{-3} \, g = 0.096 \, g$.Moles of $Mg = \frac{\text{Mass}}{\text{Atomic mass}} = \frac{0.096}{24} = 0.004 \, mol = 4 \times 10^{-3} \, mol$.Number of $Mg$ atoms $= \text{Moles} \times N_{A} = 4 \times 10^{-3} \times 6.02 \times 10^{23} = 24.08 \times 10^{20}$.Comparing with $x \times 10^{20}$,we get $x = 24.08$.The nearest integer value of $x$ is $24$.

Class 11 Chemistry Some Basic Concepts of Chemistry Mix Examples of Some Basic Concept of Chemistry

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Chlorophyll extracted from the crushed green leaves was dissolved in water to make $2 \, L$ solution of $Mg$ of concentration $48 \, ppm$. The number of atoms of $Mg$ in this solution is $x \times 10^{20}$ atoms. The value of $x$ is (Nearest Integer) (Given : Atomic mass of $Mg$ is $24 \, g \, mol^{-1}$,$N_{A} = 6.02 \times 10^{23} \, mol^{-1}$)

JEE MAIN 2022 All JEE MAIN

A
$22$
B
$24$
C
$23$
D
$20$

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Some Basic Concepts of Chemistry

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Mix Examples of Some Basic Concept of Chemistry

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$2AgF + MgCl_2 \longrightarrow MgF_2 \downarrow + 2AgCl \downarrow$

Medium

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Fill in the blanks given below:
$(i)$ The mass of $1$ mole of a substance expressed in grams is called its .........
$(ii)$ The amount of solute dissolved in $1$ $kg$ of solvent is called its .........
$(iii)$ The Fahrenheit scale in a thermometer is marked between .........
$(iv)$ In $NaCl$,each $Na^{+}$ ion is surrounded by ......... $Cl^{-}$ ions.

Medium

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Lattice enthalpy and enthalpy of solution of $NaCl$ are $788 \ kJ \ mol^{-1}$ and $4 \ kJ \ mol^{-1}$ respectively. The hydration enthalpy of $NaCl$ is ....... $kJ \ mol^{-1}$

MediumJEE MAIN 2020

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Assign $A, B, C, D$ from the given type of reaction.
$Pb(NO_3)_2 + 2 KI \longrightarrow PbI_2 \downarrow + 2 KNO_3$

Medium

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Identify the compound formed from elements $X, Y, Z$ having oxidation states $+2, +5, -2$ respectively.

MediumMHT CET 2021

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.$2AgF + MgCl_2 \longrightarrow MgF_2 \downarrow + 2AgCl \downarrow$

Lattice enthalpy and enthalpy of solution of $NaCl$ are $788 \ kJ \ mol^{-1}$ and $4 \ kJ \ mol^{-1}$ respectively. The hydration enthalpy of $NaCl$ is ....... $kJ \ mol^{-1}$

Assign $A, B, C, D$ from the given type of reaction.$Pb(NO_3)_2 + 2 KI \longrightarrow PbI_2 \downarrow + 2 KNO_3$

Identify the compound formed from elements $X, Y, Z$ having oxidation states $+2, +5, -2$ respectively.

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$2AgF + MgCl_2 \longrightarrow MgF_2 \downarrow + 2AgCl \downarrow$

Assign $A, B, C, D$ from the given type of reaction.
$Pb(NO_3)_2 + 2 KI \longrightarrow PbI_2 \downarrow + 2 KNO_3$