Which is the most economical method of removing solid matter from water?
(A) Using deactivated carbon
(B) Electrolysis
(C) Distillation
(D) Sedimentation
A biochemical compound is :
(A) a mineral based compound found in living things
(B) sulfur based compound found in living things
(C) a carbon based compound found in living things
(D) Hydrogen based compound found in living things
Which of the given metals cannot be extracted using smelting?
(A) Fe
(B) Al
(C) Zn
(D) Pb
Fe has 26 protons in its nucleus. What are the number of electrons in Fe2+ (II) ion?
(A) 24
(B) 26
(C) 28
(D) 13
Terylene is a condensation polymer of ethylene glycol and which acid?
(A) Benzoic acid
(B) Salicylic Acid
(C) Thalic acid
(D) Terephthalic acid
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