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Chemistry MCQs for NEET — Practice Questions with Answers

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How will you separate a solution of benzene and chloroform ?

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Explanation

To separate a solution of benzene and chloroform, distillation is the most appropriate method. Benzene and chloroform have different boiling points (benzene boils at 80.1°C, while chloroform boils at 61.2°C). Distillation allows them to be separated based on these differences in boiling points.

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When 32.25 gm ehtyl chloride dehydrohalogenated it gives 50% alkene. What is the mass of product ?

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Which method can be used to separate a mixture of KCl and $ KClO_ 3$ ?

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Explanation

Fractional Crystallisation is the method used to separate a mixture of KCl and $KClO_3$. This technique is based on the different solubilities of KCl and $KClO_3$ in water. By carefully controlling the temperature, one can selectively crystallise one component from the mixture, leaving the other in solution.

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Middleton’s test is used to detect

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Explanation

Middleton’s test is used to detect Sulfur (S). This test involves converting sulfur compounds into sulfur dioxide ($SO_2$) and then using barium chloride to detect the presence of sulfur dioxide by forming a white precipitate of barium sulfate.

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An organic compound weighing 4.337mg yielded 10.35mg of $ CO_2 and 3.42mg of H_2O$ on oxidation with CuO. Calculate the empirical formula of the compound.

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An organic compound contains 69% C and 4.8% H, the remainder being oxygen. Calculate the masses of $ CO_2 and H_2O $ produced when 0.2gm of this substance is completely combusted.

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In the estimation of sulphur by Carius method, 0.468gm of organic compound gave 0.668gm $ BaSO_4 $ . Calculate % of S.

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In each of the following questions, a statement (A) is given followed by Reason (R). Give your answers as A: Vapour density and density both are same R: Molecular weight is twice the density

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In each of the following questions, a statement (A) is given followed by Reason (R). Give your answers as A: Lassaigne’s test is shown by diazonium salts. R: Diazonium salts are volatile.

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Explanation

Diazonium salts do not show Lassaigne’s test because Lassaigne’s test is used to detect nitrogen, sulfur, and halogens in organic compounds. Diazonium salts, on the other hand, decompose to release nitrogen gas, and therefore the test is not applicable. Additionally, diazonium salts are generally not volatile; they are typically stable only at low temperatures and can decompose explosively when heated. Thus, both the assertion (A) and reason (R) are false.

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In each of the following questions, a statement (A) is given followed by Reason (R). Give your answers as A: Sulphur present in organic compound can be estimated quantitavely by Carius method. R: Sulphur is separated easily from other atoms in the molecules and gets precipitated as light yellow solid.

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