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JEE Main 2024 (Online) 9th April Evening Shift
Which of the following compound can give positive iodoform test when treated with aqueous $$\mathrm{KOH}$$ solution followed by potassium hypoiodite....
JEE Main 2024 (Online) 9th April Evening Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2024 (Online) 9th April Morning Shift
Identify the incorrect statements regarding primary standard of titrimetric analysis. (A) It should be purely available in dry form. (B) It should not...
JEE Main 2024 (Online) 8th April Evening Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2024 (Online) 8th April Morning Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2024 (Online) 6th April Evening Shift
During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $$\mathrm{NH}_4 \mathrm{...
JEE Main 2024 (Online) 6th April Evening Shift
The correct statement among the following, for a "chromatography" purification method is :
JEE Main 2024 (Online) 6th April Morning Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2024 (Online) 6th April Morning Shift
Which of the following statements are correct? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. An...
JEE Main 2024 (Online) 4th April Morning Shift
In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :
JEE Main 2024 (Online) 1st February Morning Shift
In Kjeldahl's method for estimation of nitrogen, $\mathrm{CuSO}_4$ acts as :
JEE Main 2024 (Online) 1st February Morning Shift
Given below are two statements : Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. ...
JEE Main 2024 (Online) 31st January Evening Shift
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water...
JEE Main 2024 (Online) 29th January Evening Shift
Chromatographic technique/s based on the principle of differential adsorption is / are A. Column chromatography B. Thin layer chromatography C. Paper ...
JEE Main 2024 (Online) 29th January Morning Shift
In chromyl chloride test for confirmation of $$\mathrm{Cl}^{-}$$ ion, a yellow solution is obtained. Acidification of the solution and addition of amy...
JEE Main 2024 (Online) 29th January Morning Shift
Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $$\mathrm{FeSO}_4$$ in presence of concentrated ...
JEE Main 2024 (Online) 27th January Evening Shift
The technique used for purification of steam volatile water immiscible substances is :
JEE Main 2023 (Online) 13th April Evening Shift
In the wet tests for detection of various cations by precipitation, $$\mathrm{Ba}^{2+}$$ cations are detected by obtaining precipitate of
JEE Main 2023 (Online) 11th April Morning Shift
When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was forme...
JEE Main 2023 (Online) 10th April Evening Shift
In Carius tube, an organic compound '$$\mathrm{X}$$' is treated with sodium peroxide to form a mineral acid 'Y'. The solution of $$\mathrm{BaCl}_{2}$$...
JEE Main 2023 (Online) 10th April Morning Shift
Given below are two statements: Statement I : Aqueous solution of K$$_2$$Cr$$_2$$O$$_7$$ is preferred as a primary standard in volumetric analysis ove...
JEE Main 2023 (Online) 8th April Evening Shift
A compound '$$\mathrm{X}$$' when treated with phthalic anhydride in presence of concentrated $$\mathrm{H}_{2} \mathrm{SO}_{4}$$ yields '$$\mathrm{Y}$$...
JEE Main 2023 (Online) 8th April Evening Shift
Given below are two statements: Statement I : Methyl orange is a weak acid. Statement II : The benzenoid form of methyl orange is more intense/deeply ...
JEE Main 2023 (Online) 6th April Evening Shift
Formation of which complex, among the following, is not a confirmatory test of $$\mathrm{Pb}^{2+}$$ ions :
JEE Main 2023 (Online) 6th April Morning Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2023 (Online) 1st February Evening Shift
Given below are two statements : Statement I : Sulphanilic acid gives esterification test for carboxyl group. Statement II : Sulphanilic acid gives re...
JEE Main 2023 (Online) 31st January Evening Shift
In Dumas method for the estimation of $\mathrm{N}_{2}$, the sample is heated with copper oxide and the gas evolved is passed over :
JEE Main 2023 (Online) 30th January Morning Shift
In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative ino...
JEE Main 2023 (Online) 29th January Morning Shift
Compound that will give positive Lassaigne's test for both nitrogen and halogen is :
JEE Main 2023 (Online) 25th January Morning Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2023 (Online) 25th January Morning Shift
Match the List-I with List-II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-...
JEE Main 2022 (Online) 25th July Evening Shift
In base vs. acid titration, at the end point methyl orange is present as
JEE Main 2022 (Online) 30th June Morning Shift
The reagent neutral ferric chloride is used to detect the presence of ______________
JEE Main 2022 (Online) 29th June Evening Shift
A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released w...
JEE Main 2022 (Online) 28th June Morning Shift
The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is :
JEE Main 2022 (Online) 26th June Morning Shift
Given below are two statements : Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocy...
JEE Main 2022 (Online) 25th June Evening Shift
During halogen test, sodium fusion extract is boiled with concentrated HNO3 to
JEE Main 2022 (Online) 24th June Evening Shift
In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?
JEE Main 2022 (Online) 24th June Morning Shift
During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. Th...
JEE Main 2021 (Online) 27th August Evening Shift
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?
JEE Main 2021 (Online) 27th August Morning Shift
Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :
JEE Main 2021 (Online) 26th August Morning Shift
Which one of the following complexes is violet in colour?
JEE Main 2021 (Online) 27th July Evening Shift
To an aqueous solution containing ions such as Al3+, Zn2+, Ca2+, Fe3+, Ni2+, Ba2+ and Cu2+ was added conc. HCl, followed by H2S.The total number of ca...
JEE Main 2021 (Online) 22th July Evening Shift
When silver nitrate solution is added to potassium iodide solution then the sol produced is :
JEE Main 2021 (Online) 20th July Evening Shift
Cu2+ salt reacts with potassium iodide to give
JEE Main 2021 (Online) 20th July Morning Shift
An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H...
JEE Main 2021 (Online) 18th March Morning Shift
Reagent, 1-napthylamine and sulphanilic acid in acetic acid is used for the detection of
JEE Main 2021 (Online) 16th March Evening Shift
Match List - I with List - II : List - I Test/Reagents/Observation(s) List - II Species detected (a) Lassaigne's...
JEE Main 2021 (Online) 26th February Evening Shift
Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.
JEE Main 2021 (Online) 26th February Morning Shift
Which of the following is 'a' FALSE statement ?
JEE Main 2021 (Online) 25th February Evening Shift
Given below are two statements :Statement I : The identification of Ni2+ is carried out by dimethyl glyoxime in the presence of NH4OH. Statement II : ...
JEE Main 2021 (Online) 25th February Evening Shift
Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?
JEE Main 2020 (Online) 6th September Evening Slot
Match the following : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Ari...
JEE Main 2020 (Online) 2nd September Evening Slot
If you spill a chemical toilet cleaning liquid on your hand, your first aid would be
JEE Main 2020 (Online) 2nd September Morning Slot
In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structur...
JEE Main 2020 (Online) 9th January Evening Slot
A, B and C are three biomolecules. The results of the tests performed on them are given below: $$ \begin{array}{|l|l|l|l|} \hline & \begin{array}{l} \...
JEE Main 2020 (Online) 7th January Morning Slot
A solution of m-chloronailimne, m-chlorophenol and m-chlorobenzoic acid in ethyal acetate was extracted initially with a saturated solution of NaHCO3 ...
JEE Main 2019 (Online) 12th April Morning Slot
An organic compound 'A' is oxidizod with Na2O2 followed by boiling with HNO3. The resultant solution is then treated with ammonium molybdate to yield ...
JEE Main 2019 (Online) 9th April Morning Slot
The organic compound that gives following qualitative analysis is : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-family:Ar...
JEE Main 2019 (Online) 8th April Morning Slot
An organic compound 'X' showing the following solubility profile is : ...
JEE Main 2019 (Online) 8th April Morning Slot
An organic compound neither reacts with neutral ferric chloride solution nor with fehling solution. it however, reacts with Grignard reagent and gives...
JEE Main 2019 (Online) 10th January Evening Slot
The correct match between item 'I' and item 'II' is : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-family:Arial, sans-ser...
JEE Main 2019 (Online) 9th January Evening Slot
The tests performed on compound X and their inferences are : .tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial, sans-serif;...
JEE Main 2019 (Online) 9th January Morning Slot
The correct match between Item-I and Item-II is : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Arial, sans-serif...
JEE Main 2018 (Online) 16th April Morning Slot
For standardizing NaOH solution, which of the following is used as a primary standard ?
JEE Main 2018 (Online) 16th April Morning Slot
In a complexometric titration of metal ion with ligand M(Metal ion) + L(Ligand) $$ \to $$ C(Complex) end point is estimated spectrophoto - metricall...
JEE Main 2018 (Offline)
Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?
JEE Main 2017 (Online) 8th April Morning Slot
A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate wit...
JEE Main 2016 (Online) 10th April Morning Slot
Sodium extract is heated with concentrated HNO3 before testing for halogens because :
AIEEE 2011
Which of the following reagents may be used to distinguish between phenol and benzoic acid ?
AIEEE 2010
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1 M ...
AIEEE 2004
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

Numerical

JEE Main 2024 (Online) 9th April Evening Shift
In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively. $$\mathrm{R}_{\mathrm{f}}$$ value o...
JEE Main 2024 (Online) 1st February Evening Shift
Following Kjeldahl's method, $1 \mathrm{~g}$ of organic compound released ammonia, that neutralised $10 \mathrm{~mL}$ of $2 \mathrm{M} ~\mathrm{H}_2 \...
JEE Main 2024 (Online) 30th January Morning Shift
On a thin layer chromatographic plate, an organic compound moved by $$3.5 \mathrm{~cm}$$, while the solvent moved by $$5 \mathrm{~cm}$$. The retardati...
JEE Main 2023 (Online) 13th April Evening Shift
$$0.400 \mathrm{~g}$$ of an organic compound $$(\mathrm{X})$$ gave $$0.376 \mathrm{~g}$$ of $$\mathrm{AgBr}$$ in Carius method for estimation of bromi...
JEE Main 2023 (Online) 13th April Morning Shift
$$\mathrm{KMnO}_{4}$$ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute $$\mathrm{H}_{2} \mathrm{SO}_{4}$$. Number of water...
JEE Main 2022 (Online) 29th July Morning Shift
In bromination of Propyne, with Bromine, 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2-tetrabromopropane obtained fr...
JEE Main 2022 (Online) 28th July Evening Shift
A sample of $$0.125 \mathrm{~g}$$ of an organic compound when analyzed by Duma's method yields $$22.78 \mathrm{~mL}$$ of nitrogen gas collected over $...
JEE Main 2022 (Online) 27th July Evening Shift
In the above reaction, $$5 \mathrm{~g}$$ of toluene is converted into benzaldehyde with $$92 \%$$ yield. The amount of benzaldehyde produced is _____...
JEE Main 2022 (Online) 25th July Morning Shift
While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from $$0.25 \mathrm{~g}$$ of the compound neutr...
JEE Main 2022 (Online) 30th June Morning Shift
An organic compound with 51.6% sulfur is heated in a Carius tube. The amount of this compound which will form 0.752 g of barium sulphate is __________...
JEE Main 2022 (Online) 29th June Morning Shift
Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL ...
JEE Main 2022 (Online) 28th June Morning Shift
A 2.0 g sample containing MnO2 is treated with HCl liberating Cl2. The Cl2 gas is passed into a solution of KI and 60.0 mL of 0.1 M Na2S2O3 is require...
JEE Main 2022 (Online) 28th June Morning Shift
In the estimation of bromine, 0.5 g of an organic compound gave 0.40 g of silver bromide. The percentage of bromine in the given compound is _________...
JEE Main 2022 (Online) 27th June Evening Shift
0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compo...
JEE Main 2022 (Online) 24th June Evening Shift
0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of N2 evolved (at STP) was found to be 22.400 mL....
JEE Main 2021 (Online) 31st August Evening Shift
The transformation occurring in Duma's method is given below :$${C_2}{H_7}N + \left( {2x + {y \over 2}} \right)CuO \to xC{O_2} + {y \over 2}{H_2}O + {...
JEE Main 2021 (Online) 27th August Morning Shift
The number of moles of CuO, that will be utilized in Dumas method for estimation nitrogen in a sample of 57.5 g of N, N-dimethylaminopentane is ______...
JEE Main 2021 (Online) 27th August Morning Shift
When 10 mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was require...
JEE Main 2021 (Online) 26th August Evening Shift
In the sulphur estimation, 0.471 g of an organic compound gave 1.44 g of barium sulphate. The percentage of sulphur in the compound is ____________%. ...
JEE Main 2021 (Online) 27th July Morning Shift
An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO3 [Carius Met...
JEE Main 2021 (Online) 25th July Evening Shift
0.8 g of an organic compound was analyzed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found...
JEE Main 2021 (Online) 22th July Evening Shift
Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene __________. (Nearest integer)
JEE Main 2021 (Online) 17th March Morning Shift
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 _____...
JEE Main 2021 (Online) 16th March Evening Shift
In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg pressure. The p...
JEE Main 2021 (Online) 25th February Evening Shift
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 m...
JEE Main 2020 (Online) 6th September Morning Slot
In an estimation of bromine by Carius method, 1.6 g of an organic compound gave 1.88 g of AgBr. The mass percentage of bromine in the compound is ____...
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