Question

The strengths of $5.6$ volume hydrogen peroxide (of density $1 \mathrm{g}/\mathrm{mL}$ ) in terms of mass percentage and molarity$\left(\mathrm{M}\right)$  respectively, are: (Take molar mass of hydrogen peroxide as $34 \mathrm{g}/\mathrm{mol}$)

JEE Main 2020 (03 Sep Shift 2)

Options

• A: 1.7 and 0.5
• B: 0.85 and 0.25
• C: 1.7 and 0.25
• D: 0.85 and 0.5

Question

A solution of two components containing ${\mathrm{n}}_1$ moles of the $1^{\text{st }}$ component and ${\mathrm{n}}_2$moles of the $2^{\text{nd }}$ component is prepared. ${\mathrm{M}}_1$ and ${\mathrm{M}}_2$ are the molecular weights of component 1 and 2 respectively. If $\mathrm{d}$ is the density of the solution in ${\mathrm{gmI}}^{-1}, {\mathrm{C}}_2$ is the molarity and ${\mathrm{x}}_2$ is the mole fraction of the $2^{\text{nd }}$ component, then ${\mathrm{C}}_2$ can be expressed as :

JEE Main 2020 (06 Sep Shift 1)

Options

• A: ${\mathrm{C}}_2=\frac{1000x_2}{{\mathrm{M}}_1+{\mathrm{x}}_2\left({\mathrm{M}}_2-{\mathrm{M}}_1\right)}$
• B: ${\mathrm{C}}_2=\frac{{\mathrm{dx}}_2}{{\mathrm{M}}_1+{\mathrm{x}}_2\left({\mathrm{M}}_2-{\mathrm{M}}_1\right)}$
• C: ${\mathrm{C}}_2=\frac{1000{\mathrm{dx}}_2}{{\mathrm{M}}_1+{\mathrm{x}}_2\left({\mathrm{M}}_2-{\mathrm{M}}_1\right)}$
• D: ${\mathrm{C}}_2=\frac{{\mathrm{dx}}_1}{{\mathrm{M}}_2+{\mathrm{x}}_2\left({\mathrm{M}}_2-{\mathrm{M}}_1\right)}$

Question

$0.023\times {10}^{22}$ molecules are present in $10\mathrm{g}$of a substance ${}^{\text{'}}\mathrm{x}^{\text{'}}.$ The molarity of a solution containing $5\mathrm{g}$ of substance 'x' in 2 L solution is $\_\_\_\_\_\_\_\_\_\times {10}^{-3}$
 

JEE Main 2020 (03 Sep Shift 2)

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Question

Complete combustion of $750 \mathrm{g}$ of an organic compound provides $420 \mathrm{g}$ of ${\mathrm{CO}}_2$ and $210 \mathrm{g}$ of ${\mathrm{H}}_2\mathrm{O}$. The percentage composition of carbon and hydrogen in organic compound is $15.3$ and ______ respectively. (Round off to the Nearest Integer)

JEE Main 2021 (16 Mar Shift 1)

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Question

In the above reaction, $3.9 \mathrm{g}$ of benzene on nitration gives $4.92 \mathrm{g}$ of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is _________ $\%$. (Round off to the Nearest Integer).

(Given atomic mass : $\mathrm{C} :12.0 \mathrm{u}, \mathrm{H} :1.0 \mathrm{u}$$\mathrm{O} :16.0 \mathrm{u},\mathrm{N} :14.0 \mathrm{u}$)

JEE Main 2021 (17 Mar Shift 1)

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Question

$4.5 \mathrm{g}$ of compound $\mathrm{A}\left(\mathrm{M}.\mathrm{W}.=90\right)$ was used to make $250 \mathrm{mL}$ of its aqueous solution. The molarity of the solution in $\mathrm{M}$ is $\mathrm{x}\times {10}^{-1}.$ The value of $\mathrm{x}$ is_____ (Rounded off to the nearest integer)

JEE Main 2021 (24 Feb Shift 1)

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Question

The ${\mathrm{NaNO}}_3$ weighed out to make $50 \mathrm{mL}$ of an aqueous solution containing $70.0 \mathrm{mg} {\mathrm{Na}}^{+}$ per $\mathrm{mL}$ is_ $\mathrm{g}$. (Rounded off to the nearest integer) [Given : Atomic weight in ${\mathrm{gmol}}^{-1}-\mathrm{Na} : 23; \mathrm{N} : 14; \mathrm{O} : 16$]

JEE Main 2021 (26 Feb Shift 2)

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Question

If a rocket runs on a fuel $\left({\mathrm{C}}_{15}{\mathrm{H}}_{30}\right)$ and liquid oxygen, the weight of oxygen required and ${\mathrm{CO}}_2$ released for every litre of fuel respectively are :
(Given : density of the fuel is $0.756 \mathrm{g}/\mathrm{mL}$)

JEE Main 2022 (24 Jun Shift 1)

Options

• A: $1188 \mathrm{g}$ and $1296 \mathrm{g}$
• B: $2376 \mathrm{g}$ and $2592 \mathrm{g}$
• C: $2592 \mathrm{g}$ and $2376 \mathrm{g}$
• D: $3429 \mathrm{g}$ and $3142 \mathrm{g}$

Question

Hemoglobin contains $0.34\%$ of iron by mass. The number of $\mathrm{Fe}$ atoms in $3.3 \mathrm{g}$ of hemoglobin is (Given : Atomic mass of Fe is $56\mathrm{u},{\mathrm{N}}_{\mathrm{A}}$ in$6.022\times {10}^{23}{ \mathrm{mol}}^{-1}$)

JEE Main 2022 (26 Jul Shift 2)

Options

• A: $1.21\times {10}^5$
• B: $12.0\times {10}^{16}$
• C: $1.21\times {10}^{20}$
• D: $3.4\times {10}^{22}$

Question

A commercially sold conc. $\mathrm{HCl}$ is $35\% \mathrm{HCl}$ by mass. If the density of this commercial acid is $1.46 \mathrm{g}/\mathrm{mL}$, the molarity of this solution is : (Atomic mass : $\mathrm{Cl}=35.5\mathrm{amu},\mathrm{H}=1\mathrm{amu}$)

JEE Main 2022 (26 Jun Shift 1)

Options

• A: $10.2 \mathrm{M}$
• B: $14.0 \mathrm{M}$
• C: $12.5 \mathrm{M}$
• D: $18.2 \mathrm{M}$

Question

$250 \mathrm{g}$ solution of $\mathrm{D}$-glucose in water contains $10.8\%$ of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are $\mathrm{H}=1\mathrm{u}; \mathrm{C}=12 \mathrm{u}; \mathrm{O}=16 \mathrm{u}$)

JEE Main 2022 (27 Jul Shift 1)

Options

• A: $1.03$
• B: $2.06$
• C: $3.09$
• D: $5.40$

Question

Consider the reaction

$4{\mathrm{HNO}}_3\left(\mathrm{l}\right)+3\mathrm{KCl}\left(\mathrm{s}\right)\to {\mathrm{Cl}}_2\left(\mathrm{g}\right)+\mathrm{NOCl}\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)+3{\mathrm{KNO}}_3\left(\mathrm{s}\right)$

The amount of ${\mathrm{HNO}}_3$ required to produce$110.0 \mathrm{g}$ of ${\mathrm{KNO}}_3$ is

(Given : Atomic masses of $\mathrm{H},\mathrm{O},\mathrm{N}$ and $\mathrm{K}$ are $1,16,14$ and $39$, respectively.)

JEE Main 2022 (29 Jul Shift 2)

Options

• A: $32.2 \mathrm{g}$
• B: $69.4 \mathrm{g}$
• C: $91.5 \mathrm{g}$
• D: $162.5 \mathrm{g}$

Question

$\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+400 \mathrm{kJ}$

$\mathrm{C}\left(\mathrm{s}\right)+\frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right)\to \mathrm{CO}\left(\mathrm{g}\right)+100 \mathrm{kJ}$

When coal of purity $60\%$ is allowed to burn in presence of insufficient oxygen, $60\%$ of carbon is converted into ' $\mathrm{CO}$' and the remaining is converted into '${\mathrm{CO}}_2$'.

The heat generated when $0.6 \mathrm{kg}$ of coal is burnt is

JEE Main 2022 (29 Jul Shift 2)

Options

• A: $1600 \mathrm{kJ}$
• B: $3200 \mathrm{kJ}$
• C: $4400 \mathrm{kJ}$
• D: $6600 \mathrm{kJ}$

Question

Production of iron in blast furnace follows the following equation

${\mathrm{Fe}}_3{\mathrm{O}}_4\left(\mathrm{s}\right)+4\mathrm{CO}\left(\mathrm{g}\right)\to 3\mathrm{Fe}\left(\mathrm{l}\right)+4{\mathrm{CO}}_2\left(\mathrm{g}\right)$

when $4.640\mathrm{kg}$ of ${\mathrm{Fe}}_3{\mathrm{O}}_4$ and $2.520\mathrm{kg}$ of $\mathrm{CO}$ are allowed to react then the amount of iror (in $\mathrm{g}$) produced is :

[Given: Molar Atomic mass $\left({\mathrm{gmol}}^{-1}\right):\mathrm{Fe}=56$

Molar Atomic mass $\left({\mathrm{gmolm}}^{-1}\right):\mathrm{O}=16$

Molar Atomic mass $\left({\mathrm{gmolm}}^{-1}\right):\mathrm{C}=12$]

JEE Main 2022 (29 Jun Shift 1)

Options

• A: $1400$
• B: $2200$
• C: $3360$
• D: $4200$

Question

$56.0 \mathrm{L}$ of nitrogen gas is mixed with excess of hydrogen gas and it is found that $20 \mathrm{L}$ of ammonia gas is produced, The volume of unused nitrogen gas is found to be_____ $\mathrm{L}$.

JEE Main 2022 (25 Jul Shift 2)

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Question

In the given reaction,

$\mathrm{X}+\mathrm{Y}+3\mathrm{Z}\rightleftarrows {\mathrm{XYZ}}_3$

if one mole of each of $\mathrm{X}$ and $\mathrm{Y}$ with $0.05 \mathrm{mol}$ of $\mathrm{Z}$ gives compound ${\mathrm{XYZ}}_3$. (Given : Atomic masses of $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$ are 10,20 and $30\mathrm{amu}$, respectively). The yield of ${\mathrm{XYZ}}_3$ is____$\mathrm{g}$.

JEE Main 2022 (28 Jul Shift 1)

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Question

The density of ' \(x\) ' \(\mathrm{M}\) solution (' \(X\) ' molar) of \(\mathrm{NaOH}\) is \(1.12 \mathrm{~g} \mathrm{~mL}^{-1}\), while in molality, the concentration of the solution is \(3 \mathrm{~m}(3 \mathrm{molal})\). Then \(x\) is (Given : Molar mass of \(\mathrm{NaOH}\) is \(40 \mathrm{~g} / \mathrm{mol}\) )

JEE Main 2024 (06 Apr Shift 1)

Options

• A: 3.5
• B: 3.8
• C: 2.8
• D: 3.0

Question

Molarity \((\mathrm{M})\) of an aqueous solution containing \(x \mathrm{~g}\) of anhyd. \(\mathrm{CuSO}_4\) in \(500 \mathrm{~mL}\) solution at \(32{ }^{\circ} \mathrm{C}\) is \(2 \times 10^{-1} \mathrm{M}\). Its molality will be ______ \(\times 10^{-3} \mathrm{~m}\). (nearest integer). [Given density of the solution \(=1.25 \mathrm{~g} / \mathrm{mL}\)]

JEE Main 2024 (09 Apr Shift 1)

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Question

The molarity of $1\mathrm{L}$ orthophosphoric acid $\left({\mathrm{H}}_3{\mathrm{PO}}_4\right)$ having $70\%$ purity by weight (specific gravity $1.54\mathrm{g} {\mathrm{cm}}^{-3}$) is ______ $\mathrm{M}$. (Molar mass of ${\mathrm{H}}_3{\mathrm{PO}}_4=98 \mathrm{g} {\mathrm{mol}}^{-1}$)

JEE Main 2024 (31 Jan Shift 2)

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Question

$10 \mathrm{mL}$ of gaseous hydrocarbon on combustion gives $40 \mathrm{mL}$ of ${\mathrm{CO}}_2\left(\mathrm{g}\right)$ and $50 \mathrm{mL}$ of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is _______.

JEE Main 2024 (01 Feb Shift 2)

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