General Knowledge Quiz: Chemistry Quiz

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Thursday, May 16, 2013

In which of the following process, a maximum increase in entropy is observed?

238. In which of the following process, a maximum increase in entropy is observed?

(A) dissolution of salt in water

(B) condensation of water

(D) melting of ice

Answer:: (C)

239. In which of the following, NH3 is not used?

(A) Group reagent for the analysis of IV group basic radical.

(B) Group reagent for the analysis of IIIgroup basic radical.

(D) Nessler's reagent

Answer:: (D)

240. In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273K?

(A) 0.071 g

(B) 0.0355 g

(D) 6.023 x 1021 molecules

Answer:: (B)

241. Which one of the following statements is true'?

(A) Drying of oil involves hydrolysis

(B) Saponification of oil yields a diol.

(D) Addition of antioxidant to oil minimizes rancidity

Answer:: (D)

242. IUPAC name of (CH3)3CCl

(A) 2 chloro 2 methyl propane

(B) t-butyl chloride

(D) 3-chloro butane

Answer:: (A)

243. Which one of the following statements is not true regarding (+) Lactose?

(A) (+) Lactose, C12H22O11 contains 8-OH groups

(B) On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose

galactose

(D) (+) Lactose is reducing sugar and does not exhibit mutarotation

Answer:: (D)

In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm) 17.45

231.In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm)

(A) 14.45

(B) 15.45

(D) 17.45

Answer:: (C)

232. In Kjeldahl's method, ammonia from 5 g of food neutralizes 30 cm3 of 0.1 N acid. The percentage of nitrogen in the food is ______.

(A) 8.4

(B) 0.84

(D) 16.8

Answer:: (B)

233. In order to increase the volume of a gas by 10%, the pressure of the gas should be

(A) increased by 10 %

(B) increased by 1 %

(D) decreased by 1 %

Answer:: (C)

234. In the brown ring test, the brown colour of the ring is due to

(A) ferrous nitrate

(B) ferric nitrate

(D) nitrosoferrous sulphate

Answer:: (D)

235. In the electrolytic refining of Zinc, ______.

(A) the impure metal is at the cathode.

(B) graphite is at the anode.

(D) the metal ion gets reduced at the anode.

Answer:: (C)

236. In the ionic equation - Bi + 6H+ + Xe- ¾¾® Bi3+ + 3H2O, the values of X is

(A) 3

(B) 4

(D) 6

Answer:: (C)

237. In the periodic table metals usually used as catalysts belong to

(A) s - block

(B) p - block

(D) f - block

Answer:: (C)

If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be 100 J mol–1 K–1

226. If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be

(A) 100 J mol–1 K–1

(B) 10 J mol–1 K–1

(D) 0.1 J mol–1 K–1

Answer:: (A)

227. If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

(A) = P ´ T

(B) =f(p) at constant T

(D) p = f(T) at constant

Answer:: (A)

228. In acetylene molecule, between the carbon atoms there are

(A) three sigma bonds

(B) two sigma and one pi bonds

(D) three pi bonds

Answer:: (C)

229. In alkaline medium, alanine exists predominantly as/in ______.

(A) zwitterion

(B) anion

(D) cation

Answer:: (B)

230. In chromite ore, the oxidation number of iron and chromium are respectively ______.

(A) +3, +6

(B) +3, +2

(D) +2, +6

Answer:: (C)

Hydrogen gas is not liberated when the following metal is added to dil. HCl Ag

219. Hydrogen gas is not liberated when the following metal is added to dil. HCl

(A) Ag

(B) Zn

(D) Sn

Answer:: (A)

220. Hydroxyl ion concentration of 1M HCl is

(A) 1 ´ 1014mol dm-3

(B) 1 ´ 10-1mol dm-3

(D) 1 ´ 101mol dm-3

Answer:: (A)

221. Identify the ore not containing iron

(A) chalcopyrites

(B) carnallite

(D) limonite

Answer:: (B)

222. Identify the reaction that does not take place in a blast furnace.

(A) CaCO3 ¾® CaO + CO2

(B) CaO + Si O2 ¾® Ca Si O2 ¾® Ca Si O3

(D) CO2 + C ¾® 2CO

Answer:: (C)

223. If n = 6, the correct sequence of filling of electrons will be

(A) ns ® np(n - 1)d ® (n - 2)f

(B) ns ® n(n - 2)f ® (n - 1)d ® np

(D) ns ® (n - 2)f ® np ® (n - 1)d

Answer:: (B)

224. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

(A) DH > Du

(B) DH = Du

(D) there is no relationship

Answer:: (C)

225. If the for a given reaction has a negative value, then which of the following gives the correct relationships for the values of DG° and Keq?

(A) DGo > 0; Keq < 1

(B) DGo > 0; Keq > 1

(D) DGo < 0; Keq < 1

Answer:: (A)

Hydrogen gas is not liberated when the following metal is added to dil. HCl

219. Hydrogen gas is not liberated when the following metal is added to dil. HCl

(A) Ag

(B) Zn

(D) Sn

Answer:: (A)

220. Hydroxyl ion concentration of 1M HCl is

(A) 1 ´ 1014mol dm-3

(B) 1 ´ 10-1mol dm-3

(D) 1 ´ 101mol dm-3

Answer:: (A)

221. Identify the ore not containing iron

(A) chalcopyrites

(B) carnallite

(D) limonite

Answer:: (B)

222. Identify the reaction that does not take place in a blast furnace.

(A) CaCO3 ¾® CaO + CO2

(B) CaO + Si O2 ¾® Ca Si O2 ¾® Ca Si O3

(D) CO2 + C ¾® 2CO

Answer:: (C)

223. If n = 6, the correct sequence of filling of electrons will be

(A) ns ® np(n - 1)d ® (n - 2)f

(B) ns ® n(n - 2)f ® (n - 1)d ® np

(D) ns ® (n - 2)f ® np ® (n - 1)d

Answer:: (B)

224. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

(A) DH > Du

(B) DH = Du

(D) there is no relationship

Answer:: (C)

225. If the for a given reaction has a negative value, then which of the following gives the correct relationships for the values of DG° and Keq?

(A) DGo > 0; Keq < 1

(B) DGo > 0; Keq > 1

(D) DGo < 0; Keq < 1

Answer:: (A)

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is Na and Mg

211. Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______.

(A) Na and Mg

(B) N and O

(D) Mg and Al

Answer:: (A)

212. Which one of these is NOT true for benzene?

(A) There are three carbon-carbon single bonds and three carbon-carbon double bonds.

(B) It forms only one type of monosubstituted product.

(D) The heat of hydrogenation of benzene is less than the theoretical value.

Answer:: (A)

213. Gram molecular volume of oxygen at STP is

(A) 11200 cm3

(B) 22400 cm3

(D) 3200 cm3

Answer:: (B)

214. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

(A) has molecules of variable molecular masses like polymers.

(B) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds.

(D) is an allotropic form of carbon.

Answer:: (B)

215. Helium is used in balloons in place of hydrogen because it is

(A) incombustible

(B) lighter than hydrogen

(D) more abundant than hydrogen

Answer:: (A)

216. Hofmann's bromamide reaction is to convert

(A) amine to amide

(B) amide to amine

(D) acid to alcohol

Answer:: (B)

217. How many chiral carbon atoms are present in 2, 3, 4 - trichloropentane?

(A) 3

(B) 2

(D) 4

Answer:: (B)

218. How many optically active stereomers are possible for butan-2, 3-diol?

(A) 1

(B) 2

(D) 4

Answer:: (B)

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is Na and Mg

211. Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______.

(A) Na and Mg

(B) N and O

(D) Mg and Al

Answer:: (A)

212. Which one of these is NOT true for benzene?

(A) There are three carbon-carbon single bonds and three carbon-carbon double bonds.

(B) It forms only one type of monosubstituted product.

(D) The heat of hydrogenation of benzene is less than the theoretical value.

Answer:: (A)

213. Gram molecular volume of oxygen at STP is

(A) 11200 cm3

(B) 22400 cm3

(D) 3200 cm3

Answer:: (B)

214. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

(A) has molecules of variable molecular masses like polymers.

(B) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds.

(D) is an allotropic form of carbon.

Answer:: (B)

215. Helium is used in balloons in place of hydrogen because it is

(A) incombustible

(B) lighter than hydrogen

(D) more abundant than hydrogen

Answer:: (A)

216. Hofmann's bromamide reaction is to convert

(A) amine to amide

(B) amide to amine

(D) acid to alcohol

Answer:: (B)

217. How many chiral carbon atoms are present in 2, 3, 4 - trichloropentane?

(A) 3

(B) 2

(D) 4

Answer:: (B)

218. How many optically active stereomers are possible for butan-2, 3-diol?

(A) 1

(B) 2

(D) 4

Answer:: (B)

For the reaction Fe2O3 + 3CO ¾® 2Fe + 3CO2 the volume of carbon monoxide required to reduce one mole of ferric oxide is 67.2 dm3

206. For the reaction Fe2O3 + 3CO ¾® 2Fe + 3CO2 the volume of carbon monoxide required to reduce one mole of ferric oxide is

(A) 22.4 dm3

(B) 44.8 dm3

(D) 11.2 dm3

Answer:: (C)

207. For the reaction H20 (l) Ý H2O(g) at 373 K and one atmospheric pressure

(A) DH = TDS

(B) DH = DE

(D) DE = 0

Answer:: (A)

208. For the reaction N2(g) + O2(g) Ý 2NO(g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO(g) + O2(g) Ý 2NO2(g). What is K for the reaction NO2(g) Ý N2(g) + O2(g)?

(A)

(B)

(C)

(D)

Answer:: (D)

209. For the reversible reaction A(s) +B(g) Ý C(g) + D(g): DG0 = -350kJ. Which one of the following statements is true?

(A) Equilibrium constant is greater than one.

(B) The entropy change is negative.

(D) The reaction should be instantaneous.

Answer:: (A)

210. Formation of coloured solution is possible when metal ion in the compound contains

(A) paired electrons

(B) unpaired electrons

(D) none of these

Answer:: (B)

For one mole of an ideal gas, increasing the temperature from 10°C to 20°C increases both the average kinetic energy and rms velocity, but not significantly.

201. For one mole of an ideal gas, increasing the temperature from 10°C to 20°C ______.

(A) increases the rms velocity by times.

(B) increases the average kinetic energy by two times.

(D) increases the rms velocity by two times.

Answer:: (C)

203. For the decomposition of a compound AB at 600 K, the following data were

obtained:

[AB] mol dm-3 Rate of decomposition of AB in mol dm-3 s-1

0.20 2.75 ´ 10-8

0.40 11.0 ´ 10-8

0.60 24.75 ´ 10-8

The order for the decomposition of AB is

(A) 1

(B) 2

(D) 0

Answer:: (B)

204. For the four successive trANSition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?

(A) Cr > Mn > Co > Fe

(B) Mn > Fe > Cr > Co

(D) Co > Mn > Fe > Cr

(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Answer:: (B)

205. For the reaction 2HI(g) Ý H2(g) + I2(g) - Q KJ , the equilibrium constant depends upon

(A) temperature

(B) pressure

(D) volume

Answer:: (A)

For a stable molecule the value of bond order must be positive

193. Enthalpy of vapourization of benzene is +35.3 kJ mol-1 at its boiling point of 80°C.The entropy change in the transition of the vapour to liquid at its boiling point

[in JK-1 mol-1] is ______.

(A) -100

(B) -441

(D) +441

Answer:: (A)

194. Entropy of the universe is

(A) continuously increasing

(B) continuously decreasing

(D) constant

Answer:: (A)

195. Excess of carbon dioxide is passed through 50 ml of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N Hydrochloric acid. The volume of Hydrochloric acid required is (At. mass of calcium = 40)

(A) 500 cm3

(B) 400 cm3

(D) 200 cm3

Answer:: (A)

196. Excess of PCl5 reacts with conc. H2SO4 giving

(A) chlorosulphonic acid

(B) thionyl chloride

(D) sulphurous acid

Answer:: (C)

197. For a chemical reaction A ® B, the rate of the reaction is 2 ´ 10-3 mol dm-3 s-1, when the initial concentration is 0.05 mol dm-3. The rate of the same reaction is 1.6 ´ 10-2 mol dm-3 s-1when the initial concentration is 0.1 mol dm-3. The order of the reaction is

(A) 3

(B) 1

(D) 0

Answer:: (A)

198. For a stable molecule the value of bond order must be

(A) negative

(B) positive

(D) there is no relationship between stability and bond order.

Answer:: (B)

200. For alkali metals, which one of the following trends is INCORRECT?

(A) Ionization energy: Li > Na > K > Rb

(B) Hydration energy: Li > Na > K > Rb

(D) Density: Li < Na < K < Rb

Answer:: (D)

An organic compound which produces a bluish green coloured flame on heating in presence of copper is chlorobenzene

188. An organic compound which produces a bluish green coloured flame on heating in presence of copper is

(A) chlorobenzene

(B) benzaldehyde

(D) benzoic acid

Answer:: (A)

189. During the formation of a chemical bond

(A) energy decreases

(B) energy increases

(D) electron-electron repulsion becomes more than the nucleus-electron attraction

Answer:: (A)

190. E1, E2 and E3 are the emf values of the three galvanic cells respectively.

a) Zn | || |Cu

b) Zn | || |Cu

c) Zn | || |Cu

Which one of the following is true?

(A) E3 > E2 > E1

(B) E2 > E3> E1

(D) E1 > E2> E3

Answer:: (A)

191. Ellingham diagram represents a graph of

(A) DG Vs T

(B) DG0 Vs T

(D) DG Vs P

Answer:: (B)

192. Enthalpy change for the reaction, 4H(g) ® 2H2(g) is –869.6 kJ. The dissociation energy of H – H bond is

(A) +217.4 kJ

(B) –434.8 kJ

(D) +434.8 kJ

Answer:: (D)

Denatured alcohol is Rectified spirit + methanol + naphtha

181. Denatured alcohol is

(A) Rectified spirit

(B) Undistilled ethanol

(D) Ethanol + methanol

Answer:: (C)

182. During the adsorption of krypton on activated charcoal at low temperature, ______.

(A) DH < 0 and DS < 0

(B) DH > 0 and DS < 0

(D) DH > 0 and DS > 0

Answer:: (A)

183. During the extraction of gold the following reactions take place

Au +CN- + H2O [X] [X] + Zn ¾® [Y] + Au X and Y are respectively

(A) [Au(CN)2]- and [ZN(CN)4]2-

(B) [Au(CN)4]3- and [ZN(CN)4]2-

(D) [Au(CN)2]- and [ZN(CN)6]4-

Answer:: (A)

184. A trANSition metal ion exists in its highest oxidation state. It is expected to behave as

(A) a chelating agent

(B) a central metal in a coordination compound

(D) a reducing agent

Answer:: (C)

185. Acrolcin test is positive for

(A) polysaccharides

(B) proteins

(D) reducing sugars

Answer:: (C)

186. Among the alkali metals cesium is the most reactive because

(A) its incomplete shell is nearest to the nucleus

(B) it has a single electron in the valence shell

(D) the outermost electron is more loosely bound than the outermost electron of the other alkali metals

Answer:: (D)

187. An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0) glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?

(A) Glutamic acid migrates to anode at pH 6. Arginine is present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution.

(B) Glutamic acid migrates to cathode and others remain uniformly distributed in solution.

(D) All three move to cathode

Answer:: (A)