41.

Which of the following compounds forms an addition compound with CH₃MgBr₂ which on hydrolysis produce a secondary alcohol ?

• HCHO

• CH₃CHO

• CH₃OCH₃

• CH₃COCH₃

Which of the following compounds on treatment first with NaNO₂/ HCl and then coupled with phenol produces p-hydroxyazobenzene ?

• Nitrobenzene

• Aniline

• Azobenzene

• Phenol

Initial setting of cement is mainly due to :

• hydration and gel formation

• dehydration and gel formation

• hydration and hydrolysis

• dehydration and dehydrolysis

Consider the following compounds :

1. Sulphur dioxide

2. Hydrogen peroxide

3. Ozone 

Among these compounds identify those that can act as bleaching agent :

• 1 and 3

• 2 and 3

• 1 and 2

• 1, 2 and 3

Which one of the following statement is wrong?

• The IUPAC name of [Co(NH₃)₆Cl₃] is hexamine cobalt (III) chloride

• Dibenzol peroxide is a catalyst in the polymerization of PVC

• Borosilicate glass is heat resistant

• Concentrated HNO₃ can be safely transported in aluminium containers

Which of the following is not a thermoplastic?

• Polystyrene

• Teflon

• Novalac

• Polyvinyl chloride

Which set is the correct pairing set (or contains complementary pairs) responsible for the structure of DNA ? (A-adenine, G-guanine, C-cytosine, T-thymine, U-uracil)

• A-T, G-C

• A-C, G-T

• A-G, C-T

• A-U, G-C

Barbituric acid and its derivatives are well known as:

• tranquilizers

• antiseptics

• analgesics

• antipyretics