Chemistry in Everyday Life Discussion

Chemistry in Everyday Life Discussion
Chemistry in Everyday Life Discussion
1. A sample of ‘soft soap’ contains
[NDA 2019]
(a) caesium (b) potassium
(c) calcium (d) magnesium
2. Which one of the following is used in
the manufacture of soaps?
[BPSC (Pre) 2000]
(a) Vegetable oil (b) Mobil oil
(c) Kerosene oil (d) Cutting oil
3. When the fats are reacted with alkali,
they form ‘soaps’. The type of reaction
taking place in the formation of soaps is
called
(a) emulsification (b) saponification
(c) halogenation (d) oxidation
4. Soap solution used for cleaning purpose
appears cloudy. This is due to the fact
that soap micelles can [CDS 2019]
(a) refract light (b) scatter light
(c) diffract light (d) polarise light
5. Soap, removes grease by [BPSC 2016]
(a) coagulation
(b) absorption
(c) emulsification
(d) osmosis
6. Which one of the following substances
is most likely to be used as soap?
[NDA 2014]
(a) CH (CH ) COOCH 3 2 12 3
(b) CH (CH ) O(CH ) CH 3 2 5 2 5 3
(c) CH (CH ) COONa 3 2 12
(d) CH (CH ) CHCl 3 2 12 2
Chemistry in Everyday Life Discussion
7. Soap helps in better cleaning of clothes
because [NDA 2020]
(a) soap acts like catalyst.
(b) it reduces the surface tension of
solution.
(c) it gives strength to solution.
(d) it absorbs the dirt.
8. Which of the following statements is not
true for soap? [HPSC 2012]
(a) Soaps are bio-degradable.
(b) Soaps cannot be used in acidic
medium.
(c) Soaps form a white curdy precipitate
with hard water.
(d) Soaps are relatively stronger in their
cleaning action than synthetic
detergents.
9. Which of the following statements are
correct? [SSC (10 2) 2018]
I. The soap molecules form structures
called micelles.
II. Soap micelles cannot scatter light.
III. Only dirt gets collected in the centre of
the micelle.
(a) Both I and II (b) Both I and III
(c) Both II and III (d) All I, II and III
10. Consider the following statements.
I. Hard soaps (common bar soaps) are
the sodium salts of fatty acids.
II. Soft soaps are the potassium salts of
fatty acids and semi-solid in nature.
Which of the statement(s) given above
is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
11. What is detergent? [BPSC (Pre) 1995]
(a) Soap (b) Medicine
(c) Catalyst (d) Refining agent
12. Which one of the following is not a
synthetic detergent? [NDA 2019]
(a) CH (CH ) CH OSO Na 3 2 10 2 3
−
(b) [CH (CH ) N (CH ) ] Br 3 2 15 3 3   –
(c) CH (CH ) COO Na 3 2 16
–
(d) CH (CH ) COO(CH CH O) 3 2 16 2 2 n
CH CH OH 2 2
13. The advantage of detergents over
soaps is [SSC (10 2) 2012]
(a) detergents are soluble in water.
(b) detergents could not give much lather.
(c) detergents give lather even with hard
water.
(d) soaps give lather with only soft
water.
Chemistry in Everyday Life Discussion
14. Assertion (A) Synthetic detergents
can lather well in hard water.
Reason (R) Synthetic detergents form
soluble calcium and magnesium salts
with hard water.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not the
correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
15. Consider the following statements.
The purpose of adding sodium sulphate
and sodium silicate to the detergent in a
washing powder is
I. to keep to washing power dry.
II. to maintain the alkalinity of the powder.
Which of these statements is/are correct?
(a) Only I (b) Only II
(c) Both I and II (d) Neither I nor II
16. Consider the following statements.
[IAS (Pre) 2003]
Sodium silicate and sodium sulphate
are mixed as detergents in washing
powders so that
I. to maintain dryness of the powder.
II. to maintain the basicity of powder.
Which of the following statements is
correct?
(a) Only I (b) Only II
(c) Both I and II (d) None of these
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