In the lime kiln, the reaction CaCO3(s) → CaO(s) + CO2 (g) goes to completion because:
of high temperature
CaO is more stable than CaCO3
CO2 escapes simultaneously
CO2 is a gaseous product
The rate of a reaction is doubled for every 10° rise in temperature. The increase in reaction rate as a result of temperature rise from 10° to 100° is :
112
512
400
614
When a beam of light is passed through a colloidal solution it :
is reflected
is scattered
transmitted
absorbed
The electron affinity values for the halogens show the following trend :
F < Cl > Br >I
F < Cl< Br< I
F > Cl > Br > I
F < Cl > Br < I
When H2S gas is passed through nitric acid, the product is:
prismatic S (colloidal)
amorphous S
monoclinic S
plastic S
Atoms in a P4 molecule of white phosphorus are arranged regularly in space in which of the following way ?
At the comers of tetrahedron
At the comers of a cube
At the comers of a four membered ring
At the centre and comers of a equivalent triangle
The catalytic activity of the transition metals and their compounds is described to :
their chemical reactivity
their magnetic behaviour
their unfilled d-orbitals
their ability to adopt multiple oxidation states and their complexing ability
D.
their ability to adopt multiple oxidation states and their complexing ability
The catalytic activity of the transition metals and their compounds is ascribed to their ability to adopt multiple oxidation states and their complexing ability.
The compound ZnFe2O4 is:
a normal spinel compound
a inverse spinel compound
interstitial compound
covalent compound
High purity Si and Ge for semiconductor properties can be obtained by :
calcination
roasting
zone refining
thermic process
Name of the alloy of aluminium which is used in aeroplane is :
duralumin
bell metal
aluminium bronze
alumina