Looking for the eleventh elegance Chemistry bankruptcy 2 Experimental Techniques in Chemistry notes? Here we've got shared the first 12th Chemistry Chapter 2 Short Questions Notes.
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| 1st-year Chemistry Chapter 2 Notes Short and Long Questions |
1st-year Chemistry Chapter 2 Notes Short Questions
01. Why is there a want to crystallize the crude product?
Insoluble impurities may be separated via way of means filtration and soluble impurities may be separated via way of means of crystallization.
02. A water-insoluble natural compound aspirin is ready via way of means of the response of salicylic acid, acetic acid, and acetic anhydride. How will you separate the product from the response combination?
The product is insoluble in water consequently it can without problems be separated via way of means of filtration. The response combination is delivered to bloodless water. Aspirin crystallize out which may be filtered without problems.
03. A stable natural compound is soluble in water in addition to chloroform. Describe a technique to gain it from this layer.
The solvent extraction method is used to split it. Take the response combination in a setting apart funnel. Add a few quantities of carbon tetrachloride in it and shake it well. Separate the carbon tetrachloride layer. Now evaporate the carbon tetrachloride to get the natural substance.
04. In the solvent extraction method, why is repeated extraction the use of a small quantity of solvent is greater green than the use of an unmarried extraction with a huge quantity of solvent?
Repeated extractions the use of small quantities of solvent are greater green due to the fact greater quantity of product is extracted. Actually, solvent extraction is a distribution manner and is managed via way of means of distribution law. A solute distributes itself among immiscible solvents that arise in a set ratio and is given via way of means of distribution coefficient:
KD = conc. of solute in a single-phase / conc. of solute in different phases
Small quantities of clean solvent have 0 Conc. of solute in it. The distribution co-green favors the solute Conc. withinside the clean solvent. Thus, repeated extraction the use of small quantities of the solvent is greater green.
05. How does a Gooch Crucible grow the fee of filtration?
Gooch Crucible is made from porcelain and has a perforated base protected with a clear paper or asbestos mat. The fee of filtration is extended via way of means of the suction filtering apparatus.
06. What is the most quantity of emission traces whilst the excited electron of a hydrogen atom in n = 6 drops to the floor country?
Answer:
The most no. of emission traces = n(n–1)2 = 6(6–1)2 =3 × five = 15
07. Question
(i) The strength related to the first orbit in a hydrogen atom is – 2.17 × 10-18 J atom-1. What is the strength related to the 5th orbit?
(ii) Calculate the radius of Bohr’s 5th orbit for the hydrogen atom.
Answer:
NCERT Solutions for Class eleven Chemistry Chapter 2 Structure of Atom Q16
(ii) For hydrogen atom ; rn = 0.529 x n2 Å
r5 = 0.529 x (five)2 = 13.225 Å = 1.3225 nm.
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