ECAT Chemistry The Halogens and Noble Gases Test Online

1. Which of the following compounds of cement sets at the slowest rate?

2. Which shows maximum catenation property?

3. Which statement is correct?

4. The halogen that is most easily reduced is

5. When K₂O is added to water, the solution is basic because it contains a significant concentration of

6. Which of the following is the lifesaving mixture for an asthma patient?

7. Which of the following has highest dipole moment?

8. Sulphuric acid has great affinity for water because

9. Gradual addition of electronic shells in the noble gases causes a decrease in their

10. XeF₄ involves which hybridization

11. Among HCL, HBr and Hl, Hi shows highest B.P due to

12. To a clear solution of compound (X) a solution of BaCl₂ is added and a heavy white precipitate is formed which does not dissolve in dilute HCl. The compound X is

13. The metal used in the thermite process because of its activity is

14. Which of the following ion has the highest value of ionic radius?

15. Which one of the halogen acid is a liquid?

16. Which halogen is most electropositive?

17. Bromine is obtained on a commercial scale from

18. In the fractional distillation of liquid air, the gas that boils off last is

19. Hydrochloric acid at 25°C is

20. Which of the following statements is incorrect about halogens?

21. Which of the noble gas has highest polarizabilities?

22. The one which does not show variable valency is

23. The solubilities of carbonates decrease down the magnesium group due to a decrease in

24. Which molecule has a coordinate covalent bond in its structure?

25. Fluorine does not show positive oxidation states due to the absence of

26. An atom with high electro negativity has

27. Electron affinity of sulphur is

28. Chlorine acts as a bleaching agent only in the presence of

29. Which of the following is acidic?

30. If one liter of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

31. Solution of sodium metal in liquid ammonia in strongly reducing due to the presence in the solution of the following

32. Crystalline form of sulphur stale at room temperature is

33. Which is the strongest acid?

34. The colour of I₂ in CCI₄ is

35. A clathrate may be defined as a

36. Plaster of Paris is used

37. Sea divers go deep in the sea water with a mixture of which of the following gases?

38. Identify the incorrect statement with respect to ozone.

39. Mark the compound which does not exist

40. The lowest boiling point of helium is due to its

41. Mark the incorrect statement about the conductance semi-conductors in photoelectric cells and solar batteries. Semi conductors show

42. In view of their low ionization energies, the alkali metals are

43. The element which has a simple cubic lattice in solid state is

44. How does the ionization energy of 1st group elements vary?

45. Which of the following is a man made element?

46. Sulphuric acid reacts with PCl₅ to give

47. Among noble gases xenon gives compounds due to

48. One which is not dissolved by dilute hydrochloric acid is

49. The spectrum of helium is expected to be similar to that of

50. The correct order of electron affinity among the following is

51. What is the atomic number (Z) of the noble gas that reacts with fluorine?

52. Which of the following is true for magnesium?

53. Which of the following compounds is explosive in nature?

54. In Solvay ammonia process, sodium bicarbonate is precipitated due to

55. The ionization potential is lowest for the

56. Point out the property which is not characteristic of alkali metals

57. Which one is the weakest oxyacid of chlorine?

58. Presence of which of the following salt increases the rate of setting of plaster of Paris.

59. The most stable +2 oxidation state is exhibited by

60. Who reported first noble gas?

61. Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

62. Which element react directly with Kr, Xe and Rn?

63. Vander Waals forces are stronger in

64. In which of the following groups, when he is placed, its all properties are satisfied?

65. Select the gas which is used in electrical discharge lights

66. The process associated with sodium carbonate manufacture is known as

67. In the modern long form of the periodic table, elements are arranged in the increasing order of

68. Sodium chloride when heated with conc. H₂SO₄ and solid potassium dichromate gives

69. Mark the element which shows only one oxidation state is its compounds

70. The noble gases consist of

71. Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon?

72. Limestone is not used in which of the following manufacturing processes?

73. Permonosulphuric acid is known as

74. The element with highest electron affinity among the halogen is

75. Bleaching powder loses its power on keeping for a long time because

76. Bromine can be liberated from KBr solution by the action of

77. The solubility of carbonates decrease down the Mg group due to decrease in

78. Neon glows in discharge tube as

79. Phosphide ion has the electronic structure similar to that of

80. Which one is hygroscopic in nature?

81. Which one of the following properties of alkali metals increases in magnitude as the atomic number rises?

82. White enamel of our teeth is

83. The atomic numbers of four elements are given below. Which one is an alkaline earth metal?

84. Which one of the elements reacts directly with nitrogen to form nitride?

85. Which of the following belongs to the halogen family?

86. What causes nitrogen to be chemically inert?

87. Which of the following is an electron management of a noble gas?

88. When one mole of bleaching powder is completely decomposed, then the mass of chlorine gas that is liberated will be

89. The percentage of lead in lead pencil is

90. Aqueous NaCl solution is electrolyzed using platinum electrodes. What is the product formed at cathode?

91. Which of the following statements is not correct for a noble gas?

92. Common oxidation state of boron are

93. XeF₄ on partial hydrolysis produces

94. The bleaching action of chlorine is due to

95. On heating quick lime with coke in an electric furnace, we get

96. Freon-12 is used as a

97. Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

98. Calcium is obtained by

99. Which halogen have most corrosive action on skin?

100. Which of the following halogen does not exhibit positive oxidation state in its compounds?

101. All the following decompose easily on heating to give oxygen except

102. Which of the halogen can displace other three elements?

103. Mark the correct statement

104. The noble gas He was discovered by

105. 6NaOH + Cl₂ → 5Nacl + Naclo₃ in this reaction chlorine is

106. Mg is an important component of which biomolecule occurring extensively in living world?

107. Which one of the following is a correct set for SiO₂?

108. The oxyacids of phosphorus in which phosphorus has the lowest oxidization state is

109. LiF is insoluble in water, while NaF and KF are soluble. This is due to

110. NaOH is prepared by the method

111. Molten sodium chloride conducts electricity due to the presence of

112. Gradual addition of electronic shells in the noble gases causes a decrease in their

113. Fluorides of Ca, Mg, Ba and Sr are

114. The halogen which has only one oxidation state is

115. Mark the smallest atom

116. Mark the nitrate which decomposes differently on heating

117. Which of the following phosphorus is most reactive?

118. Oxygen shows oxidation states

119. Lithium is strongest reducing agent among alkali metals due to which of the following factor?

120. Fluorine is a better oxidizing agent than Br₂. It is due to

121. Which noble gas is used in infilament bulbs to stop the filament burning out too quickly?

122. The electronic configuration of metal M is 1s², 2s², 2p⁶, 3s¹. The formula of its oxide would be

123. The most abundant inert gas in the atmosphere is

124. Which one has highest electron affinity?

125. SO3 is not dissolve directly in H2O because

126. Among the alkaline earth metals the element forming predominantly covalent compound is

127. In the Hoop’s process for refining of Al the fused materials form three different layers and they remain separated during electrolysis also. This is because

128. Which is the symbol of element whose atoms have the outermost configuration 2S²2P³ is

129. Keeping in view the uses of Al, mark the incorrect statement. Al is used

130. Which one of these is most reactive?

131. Nitrolim is

132. Keeping in view the uses of sodium silicate, select the incorrect statement:

133. The name of CaSO₄. ½ H₂O is

134. The oxidizing power of halogens depends upon various factors. Which are not the correct reasons?

135. Which of the following halogens does not form its oxy acids?

136. When NaOH is made, the gas released at the cathode is

137. The atomic radius increases as we move down a group because

138. Variable valency is characteristic of

139. Fluorine differs from other halogens due to

140. The shape of gaseous SnCl₂ is

141. The oxide of which of the following elements will be acidic in character

142. Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

143. Which one of them is monoatomic?

144. Which one halogen is radioactive?

145. Which is the strongest acid

146. In which form boron exist mostly in nature

147. Sea weeds are important source of

148. A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

149. The halogen having highest electron affinity is

150. Hypo is used in photography for

151. The metal used for making radiation shield is

152. A 500 g toothpaste sample has 0.2 g fluoride concentration. What is the concentration of F¯ ions in terms of ppm level?

153. In curing cement plasters, water is sprinkled from time to time. This helps is

154. Which halogen acid is a liquid no room temperature?

155. Among noble gases (from He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon

156. Inert pair effect plays an important role in case of

157. Which of the following halogens dose not form oxy acid?

158. Electropositive character increase down the group due to

159. Which of the following is most electronegative?

160. NaoH is named as caustic soda because

161. Which is valence shell configuration of halogens?

162. Polyanion formation is maximum in

163. Which is the gas among the following that reacts with H₂ is darkness?

164. Which of the following has the least ionization potential?

165. Action of caustic soda on aluminum hydroxide gives a compound having formula

166. Match List I with List II and select the answer using the codes given below:

Code	List I	Code	List II
a	XeF₄	1	Distorted octahedral
b	XeF₆	2	Tetrahedral
c	XeO₃	3	Square planar
d	XeO₄	4	Trigonal pyramidal

167. Mark the element which shows greatness inert pair effect

168. A metal is burnt in air and the ash on moistening smells of ammonia. The metal is

169. Pyrex glass is a mixture of

170. Which one is the biggest ion?

171. Alkaline earth metals comes under

172. Which noble gas is used in labors?

173. The correct sequence of elements in the decreasing order of first ionization energy is

174. An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is

175. The noble gases are

176. Which of the following is most volatile?

177. Which is the most volatile compound?

178. On heating sodium metal in a current of dry ammonia, the compound formed is

179. The type of hybridization of born in diborane is

180. Which one of the following properties is not correct for ozone?

181. Which of the following does not exhibit the periodicity in properties of the elements?

182. Mark the correct statement

183. Bond angle is minimum for

184. The last orbit of argon would have electrons

185. Which among the following species has the highest ionization energy?

186. Number of elements present in 5th period is

187. Which one has least dissociation energy?

188. The properties of lithium are similar to those of Mg this is because

189. When a colourless gas is passed through bromine water only decolourisation takes place the gas is

190. Which of the following substance is used for drying gases?

191. Which of the following is an inert gas?

192. Which one among the following form maximum number of compounds?

193. Electrolysis of fused anhydrous KCl.MgCl₂.6H₂O gives

194. Strongest reducing agent is

195. Alkali metals are generally extracted by

196. The variety of glass used in making lenses and prisms of

197. Which halogen has application in medicines mostly?

198. Indicate the correct statement

199. The number of electrons that are paired in oxygen molecule are

200. Because of its small size and due to restriction of its valence shell to an octet fluorine differs from other halogens, which behavior of fluorine is incorrect?

201. Fluorine differs from other halogens due to its small size and restriction of its valence shell to an octet. Mark the correct behavior of fluorine

202. The important ore of lead is

203. Fluorine is a stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except.

204. Aluminum is most abundant in earth’s crust, yet it is obtained from bauxite because

205. Mark the incorrect statement about ‘Li’

206. In the periodic table, the element with atomic number 16 will be placed in the group

207. All the elements of oxygen family are

208. Choose the correct statement about heat of vapourization of noble gases

209. The metal with highest electrical resistance at room temperature is

210. Epsom salt is the hydrate of one of the following

211. The following has zero valency

212. The difference of water molecules in gypsum and plaster of Paris is

213. Identify the correct statement

214. Which of the following will liberate hydrogen by its reaction with hydrochloric acid?

215. Which noble gas is used earth quake prediction?

216. When ammonia is heated with cupric oxide, a molecule of ammonia will

217. Which of the following species has maximum number of unpaired electrons?

218. The atoms with high values of first ionization potential values always have

219. An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of

220. Which is true about the electro negativity order of the following?

221. The correct formula of Plaster of Paris is

222. Heavy water is obtained by

223. I₂ is solid at room temperature because

224. Alkaline earth metals show standard electrode potential values which are very similar to their alkali metals due to

225. Which element forms an ion with charge +3?

226. AlCl₃ flumes in moist air because

227. Halogens exist in the form of

228. Which one of the following reacts with hemoglobin to form carboxuhaemoglobin?

229. Hydrogen fluorine is a lipid unlike other hydrogen halides because

230. Which of the following hydrogen halide is the weakest acid in solution?

231. Electron affinity depends on

232. Which gas can support combustion?

233. Orthophosphoric acid is

234. Air is not a commercial source of which noble gas

235. Which of the following on heating at 125°C gives plaster of Paris?

236. Which one boric acid is stable one?

237. Which of the following noble gas is not present in atmosphere?

238. Which of the following element has the maximum electron affinity?

239. Select the weakest acid among the following

240. Which of the following metal is present in chlorophyll?

241. In the electrolytic extraction of aluminum fused cryolite is added

242. Which of the following is not isoelectronic?

243. Which of the following noble gases does not have an octet of electrons in its outermost shell?

244. Which of the following is correct?

245. Which element has strongest attraction for its valence electrons?

246. What is more true about alkali metals?

247. Compared with the alkaline earth metals, the alkali metals exhibit

248. The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.

249. Which one of the following elements belongs to halogen family?

250. Elements of which of the following groups will from anions most readily?

251. Which member of the halogen family (X₂) does not show positive oxidation sate (X⁺₂)?

252. Which statement is true about IV A group

253. The structure of XeF₆

254. Which of the following alkaline earth metals is the strongest reducing agent?

255. Which of the following statement about fluorine is not correct?

256. Which of the following is most electronegative?

257. Which reason best accounts for the use of helium in modern airships?

258. Beryllium is placed above magnesium in the second group. Beryllium dust, therefore, when added to MgCl₂ solution will

259. Which of the halogen has highest electronegativity?

260. In certain respects, lithium differs from other alkali metals. The main reason for this is

261. Calico printing means

262. Which of the following species has the highest ionization potential?

263. Which statement is correct about halogens?

264. Which gives green colour in fireworks?

265. Which of the following oxides is peroxide?

266. The metal extracted by electrolysis of its fused salt is

267. P₂O₅ is heated with water to give

268. Eka-aluminum and Eka-silicon are known as

269. HNO₂ acts as an/a

270. The increase of Van der Waal’s forces in halogens is in the order of

271. The noble gas forming the maximum number of compounds

272. Which of the following has highest first ionization potential?