section 7 Flashcards
Which of the following contains least amount of
N2?
a. Coke oven gas
b. Blast furnace gas
c. Producer gas
d. Water gas (blue gas).
a
Calcination of limestone is not done in a__________ kiln for producing lime.
a. vertical shaft
b. rotary
c. fluidised bed
d. fixed bed
d
Neoprene is a
a. monomer
b. synthetic rubber
c. polyester
d. none of these
b
Saponification value/number of an oil or fat is a measure of its
a. fatty acid content.
b. degree of unsaturation of the fatty acids
present in it.
c. average molecular weight.
d. insoluble fatty acid content.
c
Ethyl alcohol cannot be produced
a. from waste sulphite substrate of papermills.
b. by esterification and hydroloysis of ethylene.
c. from molasses.
d. none of these.
d
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
a
Cement mainly contains
a. CaO, SiO2, Al2O3
b. MgO, SiO2, K2O
c. Al2O3, MgO, Fe2O3
d. CaO, MgO, K2O
a
Sand and __________ is fused at 1300°C, to produce sodium silicate.
a. limestone
b. soda ash
c. coke
b
Coke used for the production of calcium carbide
should have
a. low ash content.
b. low ignition temperature.
c. high electrical resistivity.
d. all (a), (b) and (c).
d
Sucrose is a disaccharide consisting of
a. glucose and glucose
b. glucose and fructose
c. glucose and galactose
d. fructose and galactose
b
Function of sodium thiosulphate (hypo) in
development of photographic film/plate is to
a. brighten the faint images.
b. remove metallic silver.
c. convert silver chloride to silver.
d. remove unexposed silver halide.
d
High temperature carbonisation of coal takes
place at __________ °C.
a. 2000
b. 700
c. 1100
d. < 500
c
White phosphorous is stored under water, because
a. it does not react with water.
b. it is poisonous.
c. its kindling temperature in dry air is very low.
d. it is unstable.
c
__________ is not a constituent of gun powder.
a. Carbon
b. Charcoal
c. Sulphur
d. Potassium nitrate
a
Hydrophilic group of a soap or detergent solution is
a. water hating
b. soil loving
c. water loving
d. none of these
c
Rotary kiln is not involved in the production of
a. cement
b. lime from limestone
c. slaked lime from quick lime
d. none of these
c
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is
__________ °C.
a. 25
b. 60-70
c. 150-200
d. 250-300
b
Vanillin is a type of
a. anti-pyretic drug
b. food preservative
c. flavour
d. Dye
c
Temporary hardness of water can be removed by
a. addition of alum (a coagulant).
b. boiling.
c. filtration (through gravity sand filter).
d. addition of lime.
b
More than 100 percent of __________ is present in oleum.
a. SO3
b. H2SO4
c. H2SO3
d. SO2
b