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51. What is the mass of pure ethanoic acid required to neutralize 280 mL of 0.5 molar pure lime water completely? (NTSE Delhi, Stage-I, 2016-17)
60.4 g
30.2 g
16.8g
8.4 g
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52. Out of the following, which is the incorrect statement? (NTSE Delhi, Stage-I, 2016-17)
Adsorption is always an exothermic process
The soap solution is not a colloidal solution below its CMC
'Argyrol" used in eye-lotion is a colloidal solution
Gold number is the number of moles of gold formed in anode mud during copper refining
53. Which of the following is not used as a food preservative? (NTSE Delhi, Stage-I, 2016-17)
Alitame
BHA
BHT
Na2S03
54. The substance which is known as "dry ice". (NTSE Telangana, Stage-I, 2015-16)
Potassium permanganate
Copper sulphate
Sulpher dioxide
Solid carbon dioxide
55. M(2, 8, 2) combines with N(2, 8, 7) to form a compound. The formula of the compound so formed is (NTSE Tamil Nadu, Stage-I, 2015-16)
MN
M2N
M2N3
MN2
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