General Science Chemistry- 15

253.  Number of naturally occurring elements:

(a) 90                                                  (b) 91

(c) 92                                                     (d) 93

Answer: (c)

254. Number of periods in the periodic table:

(a) 5                                                       (b) 7

(c) 18                                                     (d) 9

Answer: (b)

255. Number of groups in the periodic table:

(a) 18                                                     (b) 19

(c) 16                                                     (d) 15

Answer: (a)

256. Number of blocks in the periodic table:

(a) 4                                                      (b) 5

(c) 6                                                        (d) 7

Answer: (a)

257. Alakaline earth metals belong to ......group.

(a) Fourth                                           (b) Third

(c) Second                                            (d) First

Answer: (c)

258. Alkali metals belong to ...... group.

(a) First                                                  (b) Third

(c) Fourth                                                (d) Fifth

Answer: (a)

259. 13th group is called ........ group or Boron group:

(a) Aluminium                                      (b) Nitrogen

(c) Oxygen                                              (d) Halogen

Answer: (a)

260. 14th group is called ....... group:

(a) Carbon                                           (b) Nitrogen

(c) Halogen                                         (d) Oxygen

Answer: (a)

261. 15th group is called ....... group:

(a) Carbon                                            (b) Halogen

(c) Nitrogen                                          (d) Oxygen

Answer: (c)

262. Halogens belong to ....... group.

(a) 15^th                                                  (b) 16^th

(c) 17^th                                                   (d) 18^th

Answer: (c)

263. Compound that does not form a clear solutton with cold water is 
Answer: Benezoic Acid 

264. The lightest noble gas is
Answer: Helium 

265. Light emitted during chemical reaction is called
Answer: chemiluminescence 

266. Amber colour is imparted to glass by adding 
Answer: carbon

267. Simpson and Harrison are associated with the invention of
Answer: Chloroform 

268. Epsom salt is
Answer: hydrated magnesium sulphate 

269. Penicillin was invented by Fleming in the year 
Answer:1929 

270. The salt known as 'Pearl ash' is- 
Answer: Potassium carbonate 

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