The inexpensive and commonly used variety of glass is called soda glass. It is called so because

36. The inexpensive and commonly used variety of glass is called soda glass. It is called so because

A.            was used initially for making bottles of soda(carbonated drink)

B.            is made using soda(sodium carbonate)

C.            was initially used for storing sodium carbonate

D.            is made using soda lime

Answer: Option B

37. The gas used in the manufacture of vanaspati from vegetable oil is

A.            hydrogen            B.            oxygen

C.            nitrogen               D.            carbon dioxide

Answer: Option A

38. The ionic radii of N3-, O2-, F- and Na+ follows the order

A.            N3- > O2- > F- > Na+

B.            N3- > Na+ > O2- > F-

C.            Na+ > O2- > N3- > F-

D.            O2- > F- > Na+ > N3-

Answer: Option A

39. The graphite rods in the nuclear reactor

A.            react with U to release energy

B.            produce neutrons

C.            undergo combustion which triggers the nuclear fission

D.            convert fast moving neutrons into thermal neutrons

Answer: Option D

40.The first metal used by man was

A.            iron        B.            copper

C.            gold       D.            bronze

Answer: Option B

41.The hydronium ion is

A.            H+

B.            HO -

C.            H2+

D.            H3O+

Answer: Option D

42. The most electropositive elements among the following is

A.            Na          B.            Ca

C             K             D.            Cs

Answer: Option D

43. The method that cannot be used for removing permanent hardness of water is

A.            adding sodium carbonate

B.            distillation

C.            adding caustic soda

D.            boiling

Answer: Option D