Mole Concept & Stoichiometry · JEE Main previous year questions

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2021 10 questions

Q642021 · 1 Sept 2021 · Shift 2
In the following sequence of reactions a compound A, (molecular formula $C_{6} H_{12} O_{2}$ ) with a straight chain structure gives a $C_{4}$ carboxylic acid. A is : $A LiAl H_{4} H_{3} O^{+} B Oxidation C_{4} - carboxylic acid$
1. A. $C H_{3} - C H_{2} - COO - C H_{2} - C H_{2} - C H_{3}$
2. B. $C H_{3} - C H_{2} - CH (OH) - C H_{2} - O - CH = C H_{2}$
3. C. $C H_{3} - C H_{2} - C H_{2} - COO - C H_{2} - C H_{3}$
4. D. $C H_{3} - C H_{2} - C H_{2} - O - CH = CH - C H_{2} - OH$
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Answer: C
Q862021 · 26 Aug 2021 · Shift 2· Numerical answer
100 mL of $N a_{3} P O_{4}$ solution contains 3.45 g of sodium. The molarity of the solution is ___________ $\times 1 0^{- 2} mol L^{- 1}$ . (Nearest integer) [ $Atomic Masses - Na : 23.0 u$ , $O : 16.0 u$ , $P : 31.0 u$ ]
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Answer: 50
Q862021 · 27 Jul 2021 · Shift 2· Numerical answer
3 moles of metal complex with formula $Co (en)_{2} C l_{3}$ gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is __________. (Round off to the nearest integer)
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Answer: 6
Q822021 · 25 Jul 2021 · Shift 1· Numerical answer
Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula $CrC l_{3} .3N H_{3} .3 H_{2} O$ reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is ____.
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Answer: 0
Q872021 · 20 Jul 2021 · Shift 1· Numerical answer
To synthesize $1.0 mole$ of 2-methylpropan-2-ol from Ethylethanoate ________ equivalents of $CH_{3} MgBr$ Reagent will be required. (Integer value)
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Answer: 2
Q902021 · 20 Jul 2021 · Shift 1· Numerical answer
At $2 0^{\circ} C$ , the vapour pressure of benzene is $70 torr$ and that of methyl benzene is $20 torr$ . The mole fraction of benzene in the vapour phase at $2 0^{\circ} C$ above an equimolar mixture of benzene and methyl benzene is ________ $\times 1 0^{- 2}$ . (Nearest integer)
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Answer: 78
Q692021 · 18 Mar 2021 · Shift 1
Compound with molecular formula $C_{3} H_{6} O$ can show :
1. A.Positional isomerism
2. B.Both positional isomerism and metamerism
3. C.Metamerism
4. D.Functional group isomerism
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Answer: D
Q832021 · 16 Mar 2021 · Shift 1· Numerical answer
Complete combustion of 750 g of an organic compound provides 420 g of $C O_{2}$ and 210 g of $H_{2} O$ . The percentage composition of carbon and hydrogen in organic compound is 15.3 and _______ respectively. (Round off to the Nearest Integer).
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Answer: 3
Q862021 · 16 Mar 2021 · Shift 1· Numerical answer
A 6.50 molal solution of $KOH$ (aq.) has a density of $1.89 g cm^{- 3}$ . The molarity of the solution is _______ $mol dm^{- 3}$ . (Round off to the Nearest Integer). [Atomic masses : $K : 39.0 u$ ; $O : 16.0 u$ ; $H : 1.0 u$ ]
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Answer: 9
Q852021 · 25 Feb 2021 · Shift 2· Numerical answer
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)
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Answer: 6