Five Year Integrated M.Tech Course in Cosmetic Technology
(Semester (CBCS) Examination December-2018
COSMETIC CHEMISTRY I
Time: 2 ½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right indicate full marks.
Answer to all questions are to be written in one answer book only.
All questions carry equal marks.
Draw neat labeled diagram wherever necessary.
Use of calculator and log table is allowed.
Q.1 Select the most correct alternative and rewrite the answer: 14
pH of distilled water is
6 7
8 9
H2SO4 is?
Acid Base
Neutral None of these
pH of acid is
Below 7 Above 7
7 None of these
Addition of electron is known as
Oxidation reaction Reduction reaction
Redox reaction None of these
Limit test of Arsenic is based on the reaction of arsenic gas with hydrogen
ion to form
Yellow stain Red stain
Violet stain None of these
Which one of the following is a heavy metal?
Ag Au
Hg Cu
Following is the weak acid
H2SO4 HCl
HNO3 AlCl3
Arsenic is known as
Al Ag
As None of these
Phenolphthalein changes color in
Acids Alkalis
Water Salt solutions
10) Litmus is used to test either substance is
Acidic or alkaline Aqueous or pure liquid
Moist gas or dry gas Semi-solid or solid
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SLR-CW-1
11) Which of the following step is not part of qualitative analysis
Cation tests Heat tests
Melting point tests Solubility
12) All of the following salts are soluble except
Lead nitrate Sodium carbonate
Magnesium chloride Barium Sulfate
13) Pure water contains
Water molecules only
Hydronium ions only
Hydroxide ions only
Water molecules, hydronium ions, and hydroxide ions
14) pH scale in general uses ranges from
0-1
0-7 0-14
Q.2 Answer the following. (Any four) 08
Define Acid.
Define pH.
What do you mean by buffer?
Name any two acid base indicators.
Name any two heavy metals.
Write notes on. (Any two) 06
Define oxidation and reduction.
Discuss uses of Acids and bases.
What do you mean by limit tests?
Q.3 Answer the following. (Any two) 08
What kinds of impurities are found in cosmetics? Give their sources.
Write a note on Acid Base titrations.
Discuss the amphoteric nature of water.
Answer the following. (Any one) 06
How to prepare the buffer solution and discuss their properties.
Give the details of limit tests for heavy metals.
Q.4 Answer the following. (Any two) 10
How to control the impurities in cosmetics.
Discuss the difference between qualitative and quantitative analysis.
Define weak acid and weak base. Discuss their properties.
Answer the following. (Any one) 04
Discuss the limit tests for chlorides and sulfates.
Discuss the structure of Phenolphthalein indicator.
Q.5 Answer the following. (Any two) 14
Write a note on cosmetic raw materials.
Discuss in details Lowry-Bronsted acid base concept.
Explain in detail Lewis acid base concept.