41. Antiseptics are the chemicals which either ________ or ________ the growth of microorganisms and are applied to the ________.
A
kill, prevent, living tissues
B
kill, prevent, non-living objects
C
increase, decrease, living tissues
D
kill, increase, non-living tissues
Answer :
kill, prevent, living tissues
42. An antioxidant which is added to butter to increase its shelf life from months to years is
A
sodium benzoate
B
butylated hydroxy anisole
C
sulphur dioxide
D
all of these
Answer :
butylated hydroxy anisole
43. Glycerol is added to soap. It functions _________.
A
as a filler
B
to increase lathering
C
to prevent rapid drying
D
to make soap granules
Answer :
to prevent rapid drying
44.
Examples of three detergents are given below. Mark the correct statement following the examples.
A
I and II are non-biodegradable detergents and III is biodegradable.
B
I and II are biodegradable detergents and III is non-biodegradable.
C
I, II and III are non-biodegradable detergents.
D
I is biodegradable and II, III are non-biodegradable.
Answer :
I and II are biodegradable detergents and III is non-biodegradable.
45. Which is not true for a detergent molecule?
A
It has a non-polar organic part and a polar group.
B
It is not easily biodegraded.
C
It is a sodium salt of fatty acid.
D
It is a surface active reagent.
Answer :
It is a sodium salt of fatty acid.
46. Which of the following will not enhance nutritional value of food?
A
Minerals
B
Artificial sweeteners
C
Vitamins
D
Amino acids
Answer :
Artificial sweeteners
47. Which of the following statements is not correct?
A
Some disinfectants can be used as antiseptic at low concentration.
B
Aspirin is analgesic and antipyretic.
C
Norethindrone is an antihistamine.
D
Chloramphenicol is a broad spectrum antibiotic.
Answer :
Norethindrone is an antihistamine.
48. Which one of the following statements regarding photochemical smog is not correct?
A
Carbon monoxide does not play any role in photochemical smog formation
B
Photochemical smog is an oxidising agent in character
C
Photochemical smog is formed through photochemical reaction involving solar energy
D
Photochemical smog does not cause irritation in eyes and throat
Answer :
Photochemical smog does not cause irritation in eyes and throat
49.
For the preparation of a detergent $$'P'$$ from benzene, the following steps are involved :
\[\begin{align}
& \left( \text{i} \right)\xrightarrow[HE,\text{ Friedel-Crafts reaction}]{RCH=C{{H}_{2}}} \\
& \left( \text{ii} \right)\xrightarrow{{{{H}_{2}}S{{O}_{4}}}/{S{{O}_{3}}}} \\
\end{align}\]
\[\left( \text{iii} \right)\xrightarrow{NaOH}\] 
These steps should be in sequence of
A
(i), (ii), (iii)
B
(ii), (i), (iii)
C
(ii), (iii), (i)
D
(i), (iii), (ii)
Answer :
(i), (ii), (iii)
50. Various phenol derivatives, tincture of iodine $$\left( {2 - 3\% } \right){I_2}$$ in (water / alcohol) and some dyes like methylene blue are
A
antiseptics
B
disinfectants
C
analgesics
D
antipyretics
Answer :
antiseptics