Soap cannot be used with hard water, because _________________?
(A) Hard water contains sulphate
(B) They form insoluble calcium soaps which precipitate
(C) They attract back the removed dirt
(D) None of these
The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about ________________ cm2/gm?
(A) 800
(B) 1600
(C) 4000
(D) 8500
Phenolic antiseptics are added in the __________________ soap?
(A) Shaving
(B) Medicated
(C) Metallic
(D) Transparent
Baking soda is chemically represented by__________________?
(A) Na2CO3
(B) NaHCO3
(C) Na2CO3.H2O
(D) Na2CO3.10H2O
20% oleum means that in 100 kg oleum, there are 20 kg of_____________________?
(A) SO3 and 80kg of H2SO4
(B) H2SO4 and 80kg of SO3
(C) SO3 for each 100 kg of H2SO4
(D) None of these
Penicillin is made employing _______________ fermentation process?
(A) Continuous
(B) Aerobic batch
(C) Anaerobic batch
(D) None of these
Fermentation is adversely affected by the____________________?
(A) Presence of air
(B) Absence of air
(C) High concentration
(D) Presence of ammonium salts
In the Solvay process, the product from the calciner is___________________?
(A) Light soda ash
(B) Dense soda ash
(C) Sodium bicarbonate
(D) Dehydrated soda ash
Naphthols are derivatives of________________?
(A) Methyl amine
(B) Naphthalene
(C) Phenol
(D) Xylene
Which one of the following is not an elastomer ?
(A) Polyisoprene
(B) Neoprene
(C) Nitrile-butadiene
(D) None of these