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Question
Consider the following chemicals
(a) Benzene
(b) Carbon tetrachloride
(c) Sodium carbonate
(d) Trichloroethylene
Which of the above is/are used as dry cleaning chemical?
Options:
A .  (a) only
B .  (b) only
C .  (a), (b) and (d) only
D .  (a), (b), (c) and (d)
Answer: Option C
:
C
Option:(c)

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