Chemistry : General Knowledge Questions and Answers

Q71. An element which is preserved under water is 

[A] red phosphorus

[B] white phosphorus

[C] sodium

[D] sulphur

Q72. Which of the following is not a property of water?

[A] Low specific heat

[B] Low heat of vaporisation

[C] Low density

[D] All of the above

Q73. A pure substance can only be

[A] an element or a compound

[B] Compound

[C] a heterogeneous mixture

[D] an element

Q74. Orlon is a polymer of

[A] Acrylonitrile

[B] Dacron

[C] Polyamide Nylon

[D] None of the above

Q75. Systematic name for (CuI)s ?

[A] Ferrous Oxide

[B] Copper Iodide

[C] Cobalt Fluoride

[D] All of the above

Q76. What is the conjugate base of H2O?

[A] OH-

[B] NH3+

[C] H2O

[D] All the above

Q77. Name the Scientist who stated that matter can be converted into energy

[A] Einstein

[B] Avogadro

[C] Lavoisier

[D] Boyle

Q78. The process of change from liquid to gas is called

[A] Decantation

[B] Condensation

[C] Vaporisation

[D] Precipitation

Q79. Blue litmus paper turns ____________ on contact with an acidic solution.

[A] red

[B] brown

[C] yellow

[D] green

Q80. Who is the father of modern chemistry?

[A] Lavoisier

[B] Dalton

[C] Mendeleeff

[D] Priestley