211 Q) "Assertion (A) The natural rubber is the polymer of m-isoprene.
Reason (R) Poly-rram-isoprene is called Gutta-percha."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
212 Q) In the modern food processing industries, the foodstuffs are found to be preserved in the brine solution. What is the brine solution?
(a)Saturated solution of MgCl2
(b)Saturated solution of carbonic acid
(c)Saturated solution of NaCl
(d)Saturated solution of FeCl3
213 Q) Which one of the following is associated with the formation of brown air in traffic congested cities?
(a)Sulphur dioxide
(b) Nitrogen oxide
(c)Carbon dioxide
(d)Carbon monoxide
214 Q) What is the process by which a lipid mass is converted into a number of small droplets?
(a) Saponification
(b)Emulsification
(c) Oxidation
(d)Dehydrogenation
215 Q) Which one of the following alkali metals is the lightest?
(a) Na
(b) Cs
(c) K
(d) Rb
216 Q) "Which one of the following consists only the ores of magnesium?
"
(a) Magnesite, carnallite, cassiterite, dolomite, epsom salt
(b) Magnesite, carnallite, dolomite, kieserite, epsom salt
(c) Magnesite, carnallite, dolomite, galena, malachite
(d) Magnesite, cassiterite, kieserite, galena, malachite
217 Q) " Assertion (A) A covalent bond is formed by the sharing of pairs of electrons between atoms.
Reason (R) Covalency is greatest between atoms of different electronegativities."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
218 Q) What is called as Jeweller's rouge?
(a) Ferric carbonate
(b)Ferrous carbonate
(c) Ferrous oxide
(d) Ferric oxide
219 Q) Which one among the following metal ions is essential for erythropoesis in human beings?
(a) Ca2+ ion
(b) Mg2+ ion
(c) Cu2+ ion
(d) Fe2+ ion
220 Q) "Which of the following gases in the atmosphere is/are responsible for acid rains?.
1.Oxides of sulphur
2.Oxides of nitrogen
3.Oxides of carbon
Select the correct answer using the codes given below"
(a)1 and 2
(b) 1 and 3
(c) Only 2
(d) 1, 2 and 3
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