Refractory bricks having high thermal conductivity is desirable, when it is to be used in the _________________?
(A) L.D. converter
(B) Blast furnace
(C) Rotary kiln
(D) Recuperator
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on ____________________?
(A) Slaked lime
(B) Soda lime
(C) Calcium perchlorate
(D) None of these
Enamels______________________?
(A) Give good glossy finish
(B) Are same as varnish
(C) Are prepared from non-drying oil
(D) Do not contain pigment
Permanent hardness of water can be removed by_________________?
(A) Addition of soda ash to it
(B) Treating it with zeolites
(C) Passing it through sodium hexametaphosphate
(D) All A , B, and
Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called___________________?
(A) Polyurethane
(B) Silicone
(C) Teflon
(D) Epoxy resin
CaCl(OCl) is the chemical formula of___________________?
(A) Hypo
(B) Bleaching powder
(C) Plaster of Paris
(D) Aqua regia
Bio-degradable detergents ___________________?
(A) Can be readily oxidised
(B) Pose problem in sewerage plant
(C) Have an isoparaffinic structure
(D) Should not be used as it spoils the cloth
Laboratory glass wares which reacts with hydrofluoric acid, are made of the ______________ glass?
(A) Lead
(B) Borosilicate
(C) Soda lime
(D) Alkali silicate
Polymethyl methacrylate (PMMA) is known as ____________________?
(A) Bakelite
(B) Teflon
(C) Perspex
(D) Nylon-6
Function of thinner in a paint is to ______________________ ?
(A) Accelerate the oxidation of oil
(B) Prevent gelling of the paint
(C) Suspend pigments & dissolve film forming materials
(D) Form a protective film