NEET Chemistry Questions: Purification and Characteristics of Organic Compounds

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Which of the following is a technique of purification of organic compound ?




Distillation is a technique of purification of organic compounds. It involves heating a liquid to create vapor and then condensing the vapor back into a liquid. This method is commonly used to separate mixtures based on differences in their boiling points.
Which of the following is/are method (s) of checking the purity of organic compound ?




Both chromatography and spectroscopy are methods used to check the purity of organic compounds. Chromatography separates components of a mixture based on their movement through a stationary phase, while spectroscopy analyzes the interaction of light with the sample to identify and quantify the compounds present.
The formula representing a simple ratio of atoms of different elements present in a molecule of the substance is called




The empirical formula represents the simplest whole-number ratio of atoms of different elements in a molecule. For example, the empirical formula of hydrogen peroxide (H₂O₂) is HO, which indicates the simplest ratio of hydrogen to oxygen is 1:1.
What is called the purification technique based on difference in the solubilities of the compound and the impurities in a given solvent ?




Crystallization is a purification technique based on the difference in the solubilities of the compound and the impurities in a given solvent. During crystallization, the desired compound forms solid crystals from a solution, leaving impurities in the solution.
Empirical formula of a compound is $ CH_2O $ and its vapour density is 30. What is the molecular formula of compound ?




No explanation available.
An organic compound contains C = 36%, H = 6%. What is the empirical formula of compound ?




No explanation available.
What should be the property of solvent used in crystallisation ?




For effective crystallization, the solvent should exhibit two main properties: the impure compound should be sparingly soluble in it at room temperature and appreciably soluble at higher temperatures. This ensures that upon cooling, the pure compound crystallizes out, leaving impurities in the solution.
Which method of purification of organic compound is useful to separate liquids having sufficient difference in their boiling point ?




Distillation is useful for separating liquids with a significant difference in their boiling points. This method relies on heating the mixture to vaporize the more volatile component, which is then condensed back into a liquid in a separate container.
An organic compound on analysis gave C = 48gm, H = 8gm and N = 56gm. Volume of 1.0 gm of the compound was found to be 200 ml at STP. What is the molecular formula of the compound ?




200ml of compound = 1 gm $ \therefore $ 22400 ml of compound = 112 gm
Which of the following method can be empolyed to separate a mixture of Chloroform (b.p334k) and aniline (b.p 457k) ?




To separate a mixture of chloroform (b.p 334K) and aniline (b.p 457K), distillation can be used. The substantial difference in boiling points allows for effective separation by selectively boiling and condensing each component.
Insulin contains 3.4% Sulphur. The minimum molecular weight of insulin is




To find the minimum molecular weight of insulin, we use the percentage of sulfur present. Given that insulin contains 3.4% sulfur, we assume the presence of one sulfur atom in the smallest unit of insulin. The atomic weight of sulfur is approximately 32 g/mol. Let's denote the minimum molecular weight of insulin as M. The percentage of sulfur can be expressed as (32/M) * 100% = 3.4%. Solving for M, we have M = (32 * 100) / 3.4 = 941.18. Since 941.18 is closest to option 940, the minimum molecular weight of insulin is approximately 940.
Which element is estimated by Carius method ?




The Carius method is used for the quantitative determination of halogens (chlorine, bromine, and iodine), sulfur, and phosphorus in organic compounds. The organic compound is heated with fuming nitric acid in a sealed tube, resulting in the formation of silver halide (if halogens are present) which can be weighted. Therefore, the element estimated by the Carius method is Halogen.

What is relation between the following pairs 





No explanation available.
Distillation under reduced pressure is used when ...




Distillation under reduced pressure is used when a liquid has a very high boiling point and decomposes at or below its boiling point. The reduced pressure lowers the boiling point of the liquid, allowing it to be distilled without decomposition.
In Carius method, 0.099 g compound gave 0.287 gm AgCl. What is the % of Cl ?




$ \% Cl = { 35.5 \over 143.5 } \times { 0.287 \over 0.099} \times 100 $