DDT stands for___________________?

Related Mcqs:

1. Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at _____________ °C ?

   A. 15-30
   B. 90-100
   C. 250-300
   D. < 0

2. The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is _________________?

   A. Dilute H2SO4
   B. Oleum
   C. Ultraviolet light
   D. None of these

3. Dichloro diphenyl ________________ is the full form of DDT (an insecticide) ?

   A. Tetrachloroethane
   B. Trichloroethane
   C. Tetrachloromethane
   D. Trichloromethane

4. DDT should not be allowed to come in contact with iron (during its manufacture) to _______________?

   A. Avoid its decomposition
   B. Prevent sulphonation of the monochlorobenzene by the acid catalyst
   C. Achieve non-hygroscopic property
   D. None of these

5. High temperature carbonisation of coal takes place at __________________ °C?

   A. 2000
   B. 700
   C. 1100
   D. < 500

6. The purpose of tanning in leather industry is to____________________?

   A. Stiffen the leather
   B. Smoothen the leather
   C. Make it flexible
   D. Impart water resistance

7. ____________________ process is used for producing soda ash?

   A. Chamber
   B. Chance
   C. Tromp
   D. Solvay

8. Basic oxide is absent in ___________________ glass?

   A. Flint
   B. Pyrex
   C. Quartz
   D. All A, B. & C

9. Plasticisers are added to paints to______________________?

   A. Make it corrosion resistant
   B. Make glossy surface
   C. Give elasticity & prevent cracking of the film
   D. Increase atmospheric oxidation

10. Resistance to fusion of the refractory under a steady rising temperature condition is called ____________________ ?

    A. Spalling
    B. Refractoriness
    C. Both A. & B.
    D. Neither A. nor B.