Stoichiometric and Volumetric Calculations

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JEE Advanced 2021

The treatment of an aqueous solution of 3.74 g of $Cu(NO_{3})_{2}$ with excess KI results in a brown solution along with the formation of a precipitate. Passing $H_{2} S$ through this brown solution gives another precipitate X. The amount of X (in g) is ______. [Given : Atomic mass of H = 1, N = 14, O = 16, S = 32, K = 39, Cu = 63, I = 127]

JEE Advanced 2018

LEVELJEE Advanced

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl2.6H2O to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952g of NiCl2.6H2O are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is______. (Atomic weights in g mol–1: H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)

JEE Advanced 2020

LEVELJEE Main

5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the NaOH solution ?

JEE Advanced 2022

LEVELJEE Advanced

Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas Q. The amount of CuSO4 (in g) required to completely consume the gas Q is ______. [Given : Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]

JEE Advanced 2018

LEVELJEE Main

To measure the quantity of $MnCl_{2}$ dissolved in an aqueous solution, it was completely converted to $KMnO_{4}$ using the reaction, $MnCl_{2} + K_{2} S_{2} O_{8} + H_{2} O \to KMnO_{4} + H_{2} SO_{4} + HCl$ (equation not balanced). Few drops of concentrated $HCl$ were added to this solution and gently warmed. Further, oxalic acid ( $225 mg$ ) was added in portions till the colour of the permanganate ion disappeared. The quantity of $MnCl_{2}$ (in $mg$ ) present in the initial solution is ______. (Atomic weights in $g mol^{- 1}$ : $Mn = 55$ , $Cl = 35.5$ )

JEE Advanced 2020

LEVELJEE Main

Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of hydrogen gas in liters (L) produced at $300 K$ and $1.0 atm$ pressure, when $5.4 g$ of aluminium and $50.0 mL$ of $5.0 M$ sulfuric acid are combined for the reaction? (Use molar mass of aluminium as $27.0 g mol^{- 1}$ , $R = 0.082 atm L mol^{- 1} K^{- 1}$ )

JEE Main 2021

LEVELJEE Main

In the above reaction 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ……… % (Round off to the nearest integer). (Given, atomic mass C : 12.0 u, H : 1.0 u, O : 16.0 u, N : 14.0 u)

JEE Main 2020

LEVELJEE Main

While titrating dilute $HCl$ solution with aqueous $NaOH$ , which of the following will not be required?

(A)

Pipette and distilled water

(B)

Burette and porcelain tile

(C)

Bunsen burner and measuring cylinder

(D)

Clamp and phenolphthalein

JEE Main 2021

LEVELJEE Main

......... grams of 3-hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) ( $C_{3} H_{4} O$ ), if the percentage yield is 64 (Round off to the nearest integer). [Given : Atomic masses : C = 12.0 u, H = 1.0 u, O = 16.0 u]

JEE Main 2021

LEVELJEE Main

Consider the above reaction where $6.1 g$ of benzoic acid is used to get $7.8 g$ of m-bromo benzoic acid. The percentage yield of the product is ......... . (Round off to the nearest integer). [Given : Atomic masses : $C = 12.0 u, H = 1.0 u, O = 16.0 u, Br = 80.0 u$ ]

JEE Main 2019

LEVELJEE Main

50 mL of 0.5 M oxalic acid is needed to neutralise 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is

A $20.0 mL$ solution containing $0.2 g$ impure $H_{2} O_{2}$ reacts completely with $0.316 g$ of $KMnO_{4}$ in acid solution. The purity of $H_{2} O_{2}$ (in $%$ ) is ............. (molecular weight of $H_{2} O_{2} = 34$ ; molecular weight of $KMnO_{4} = 158$ ).

JEE Main 2021

LEVELJEE Main

Consider titration of NaOH solution versus $1.25 M$ oxalic acid solution. At the end point following burette readings were obtained. (i) $4.5 mL$ (ii) $4.5 mL$ (iii) $4.4 mL$ (iv) $4.4 mL$ (v) $4.4 mL$ If the volume of oxalic acid taken was $10.0 mL$ , then the molarity of the NaOH solution is ......... M. (Rounded off to the nearest integer)

JEE Main 2021

LEVELJEE Main

Methylation of $10 g$ of benzene gave $9.2 g$ of toluene. Calculate the percentage yield of toluene ......... . (Nearest integer)

JEE Main 2019

LEVELJEE Main

25 mL of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solution?

0.4 g mixture of NaOH, $Na_{2} CO_{3}$ and some inert impurities was first titrated with $\frac{N}{10}$ HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of $Na_{2} CO_{3}$ in the mixture is ............. (Rounded off to the nearest integer).

JEE Main 2021

LEVELJEE Main

When $10 mL$ of an aqueous solution of $KMnO_{4}$ was titrated in acidic medium, equal volume of $0.1 M$ of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of $KMnO_{4}$ in $g/L$ is ......... $\times 1 0^{- 2}$ . (Nearest integer) [Atomic mass of $K = 39$ , $Mn = 55$ , $O = 16$ ]

JEE Main 2021

LEVELJEE Main

$2 SO_{2} (g) + O_{2} (g) ⟶ 2 SO_{3} (g)$ The above reaction is carried out in a vessel starting with partial pressure $p_{SO_{2}} = 250 m bar$ , $p_{O_{2}} = 750 m bar$ and $p_{SO_{3}} = 0$ . When the reaction is complete, the total pressure in the reaction vessel is ............ m bar. (Round off of the nearest integer).

JEE Main 2015

LEVELJEE Main

The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8} H_{7} SO_{3} Na$ (mol. wt. = 206). What would be the maximum uptake of $Ca^{2 +}$ ions by the resin when expressed in mole per gram resin?

(A)

\frac{1}{103}

(B)

\frac{1}{206}

(C)

\frac{2}{309}

(D)

\frac{1}{412}

JEE Main 2019

LEVELJEE Main

25 g of an unknown hydrocarbon upon burning produces 88 g of $CO_{2}$ and 9 g of $H_{2} O$ . This unknown hydrocarbon contains

(A)

20 g of carbon and 5 g of hydrogen

(B)

22 g of carbon and 3 g of hydrogen

(C)

24 g of carbon and 1 g of hydrogen

(D)

18 g of carbon and 7 g of hydrogen

JEE Main 2020

LEVELJEE Main

$NaClO_{3}$ is used, even in spacecrafts, to produce $O_{2}$ . The daily consumption of pure $O_{2}$ by a person is $492 L$ at $1 atm$ , $300 K$ . How much amount of $NaClO_{3}$ , in grams, is required to produce $O_{2}$ for the daily consumption of a person at $1 atm$ , $300 K$ .......... ? $NaClO_{3} (s) + Fe (s) \to O_{2} (g) + NaCl (s) + FeO (s)$ $R = 0.082 L atm mol^{- 1} K^{- 1}$

JEE Main 2021

LEVELJEE Main

15 mL of aqueous solution of $Fe^{2 +}$ in acidic medium completely reacted with 20 mL of 0.03 M aqueous $Cr_{2} O_{7}^{2 -}$ . The molarity of the $Fe^{2 +}$ solution is ...... $\times 1 0^{- 2}$ M (Round off to the nearest integer).

JEE Main 2021

LEVELJEE Main

250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is $\dots \times 1 0^{21}$ . (Nearest integer) ( $N_{A} = 6.022 \times 1 0^{23}$ )

JEE Main 2020

LEVELJEE Advanced

The volume (in $mL$ ) of $0.125 M$ $AgNO_{3}$ required to quantitatively precipitate chloride ions in $0.3 g$ of $[Co (NH_{3})_{6}] Cl_{3}$ is ......... . $M_{[Co (NH_{3})_{6}] Cl_{3}} = 267.46 g/mol$ $M_{AgNO_{3}} = 169.87 g/mol$

Comprehension Passage

The value of x is ______.

The value of y is ______.

Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas Q. The amount of CuSO4 (in g) required to completely consume the gas Q is ______. [Given : Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]

In the above reaction 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ……… % (Round off to the nearest integer). (Given, atomic mass C : 12.0 u, H : 1.0 u, O : 16.0 u, N : 14.0 u)

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?

50 mL of 0.5 M oxalic acid is needed to neutralise 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene ......... . (Nearest integer)

25 mL of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solution?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } 25 g of an unknown hydrocarbon upon burning produces 88 g of CO2​ and 9 g of H2​O. This unknown hydrocarbon contains

While titrating dilute $HCl$ solution with aqueous $NaOH$ , which of the following will not be required?

Methylation of $10 g$ of benzene gave $9.2 g$ of toluene. Calculate the percentage yield of toluene ......... . (Nearest integer)

25 g of an unknown hydrocarbon upon burning produces 88 g of $CO_{2}$ and 9 g of $H_{2} O$ . This unknown hydrocarbon contains