LATEST

Thursday 10 November 2016

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) 15th                                                  (b) 16th
(c) 17th                                                   (d) 18th
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 
<Next Page>< 0102,...1011121314, 15, 16171819>



* SCERT KERALA TEXT BOOKS FOR CLASS II, IV, VI, VIII, IX, X, XII – FREE DOWNLOAD ---> Click here
* NCERT & CBSE TEXT BOOKS FOR ALL CLASSES – FREE DOWNLOAD ---> Click here
* NCERT & CBSE TEXT BOOKS SOLUTIONS FOR ALL CLASSES ---> Click here

No comments:

Post a Comment