Dense soda ash used in the manufacture of glass, is chemically represented by
Na2CO3
Na2CO3.10H2O
Na2CO3.H2O
Na2HCO3
Correct Answer :
C. Na2CO3.H2O
Related Questions
Flash point of most vegetable oils is about __________ °C.
50
100
200
300
Phenol formaldehyde resin is used as an adhesive in making
Laminates
Card boxes
Furniture
Books
Fluorescent dyes are added in detergents to
Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
Attain distinctiveness from other brands
Act as tarnish inhibitor for metals like German silver
None of these
Frasch process is for
Making oxygen
Producing helium
Mining sulphur
Making nitrogen
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
L.D. converter
Blast furnace
Rotary kiln
Recuperator
Dacron (or Terylene) fibres as compared to nylon fibres have
Better heat & acid resistant properties
Poorer resistance to alkalis
Poorer dyeability
All (A), (B) and (C)
Inversion of sucrose produces
Fructose
Glucose
Both (A) & (B)
Neither (A) nor (B)
Carboxymethyl cellulose (CMC) is added in detergents to
Prevent redeposition of soil on cleaned surface
Act as optical brightening agent
Inhibit corrosion in washing machines made of aluminium
None of these
Higher viscosity index of a lubricating oil denotes
Less changes in fluidity of oil with temperature
Substantially high change in fluidity of oil with temperature
Its unsuitability under varying temperature conditions
None of these
Thermosetting plastic materials
Can be repeatedly melted
Is useful for melt casting
Cannot be melted after forming
Is useful for spinning
Zeigler process
Produces high density polyethylene
Produces low density polyethylene
Uses no catalyst
Employs very high pressure
Starting material for the commercial production of ethyl alcohol in India is
Rice
Molasses
Fruit of Mahua tree
Maize
Main constituents of natural rubber is
Polystyrene
Polyisoprene
Polybutadiene
Polychlorophrene
Which of the following is an organometallic compound?
Isopropyl alcohol
Tetra-ethyl lead
Zeolite
Cumene
Pick out the wrong statement.
Pasteurisation of milk involves moderate heating followed by cooling
Bakeries and breweries make use of yeasts
Enzyme is a complex nitrogenous compound
Oils and fats are alkaloids
Pick out the wrong statement.
Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively
Protein catalysts are called enzymes
The rate of chemical reaction is independent of the concentration of reactants at high concentration of enzymes
Total sugar content in molasses is about 10%
Vegetable oils and fats basically differ in their
Density ranges
Physical state
Chemical composition
Chemical properties
Wax is a
Mixture of glycerides
Mixture of esters of polyhydric alcohols excepting glycerine
Liquid at room temperature
Mixture of glycerides of fatty acids
Oleum produces fumes of
SO2
H2SO4
SO3
SO2 + H2SO4
Varnish does not contain
Thinner
Pigment
Both (A) & (B)
Neither (A) nor (B)
Percentage of glycerine present in the spent lye obtained during soap manufacture is about
0.5
5
20
35
The most widely used coagulant for removing suspended impurities from water is
Bleaching powder
Chlorine
Calcium sulphate
Alum
__________ is an ore of lead.
Quartz
Galena
Siderite
Chalcopyrite
Sulphur removal by heating of pyrite ore in presence of air is called its
Reduction
Roasting
Calcination
Smelting
In the manufacture of viscose rayon, the raw material used industrially is
Eucalyptus wood
Bamboo
Bagasse
Fine teak wood
Fermentator temperature during production of alcohol from molasses is around __________ °C.
5
30
130
300
Refractory bricks burnt at very high temperature have got
Greater resistance to corrosion by slags
Less resistance to corrosion by slags
High spalling tendency
None of these
Fermentation is adversely affected by the
Presence of air
Absence of air
High concentration
Presence of ammonium salts
Which of the following sugars is the sweetest?
Glucose
Fructose
Sucrose
Lactose
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
Cationic
Anionic
Amphoteric
Semi polar