(a) formic acid
(b) oxallic acid
(c) citric acid
(d) acetic acid
Ans: (b)
220. Itching due to insect bite is caused by- [CDS 2010]
(a) Formic acid
(b) Acetic acid
(c) Lactic acid
(d) Maleic acid
Ans: (b)
221. Which of the following is chemical formula of urea:
(a) NH4Cl
(b) NH2CONH4
(c) NH2CONH2
(d) NH3
Ans: (c)
222. In urea, nitrogen is to be found in the form of :
(a) nitrate
(b) nitrite
(c) ammonium
(d) amide
Ans: (d)
223. The percentage amount of nitrogen present in urea is :
(a) 26%
(b) 36%
(c) 46%
(d) 60%
Ans: (c)
224. The first synthesis of urea in the laboratory was done by :
(a) Williamson
(b) Kolbe
(c) Wohler
(d) Bertholet
Ans: (c)
225. A woman intends a chemical wash of her ornaments without any quantity loss, then which of the following
chemicals will be suitable for the wash? [NDA 2010]
(a) aquaregia
(b) conc H2SO4
(c) conc NaOH
(d) solution of NaS2O7
Ans: (d)
226. Which of the following is used in Dry Cleaning:
(a) benzene
(b) nitrobenzene
(c) chlorobenzene
(d) hydroxic benzene
Ans: (a)
227. Which of the following is obtained by the reaction of benzene and chlorine in the presence of a catalyst? [CDS
2002]
(a) benzene hexachloride
(b) benzyle chloride
(c) chloro benzene
(d) benzoyl chloride
Ans: (c)
228. Trinitro Toluene (TNT) is a / an :
(a) pesticide
(b) insecticide
(c) explosive
(d) germicide
Ans: (c)
351