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Bragg’s law is given by equation
n? = 1/2 d sin ?
n ? = 2 d sin ?
2n? = d sin ?
n ? = 2 ? sin ?
If NA is Avogadro’s number then number of valence electrons in 4.2 g of nitride ions N3- is
4.2
2.4 NA
1.6
3.2
When KCIO3 is heated it decomposes into KCI and O2 if some MnO2 is added the reaction goes much faster because
MnO2 acts as a catalyst
MnO2 decomposes to give O2
Better contact is provided by MnO2
MnO2 provides heat by reacting
The weight of 11.2 liters of CO2 at S.T.P. would be
22 g
88 g
44 g
32 g
An endothermic reaction is one in which
Heat is converted into mechanical work
Heat is evolved
Heat is converted into electricity
Heat is obsorbed
Formic acid is obtained when
Calcium acetate is heated with conc.H2SO4
Acetaldehyde is oxidized with K2CrO7 and H2SO4
Calcium formate is heated with calcium acetate
Glycerol is heated with oxalic acid
Which of the following does not reflect the periodicity of elements?
Electronegativity
Neutron/proton ratio.
Bonding behaviour
Ionisation potential
Alum is not used
In purification of water
In tanning of leather
As a mordant in dyeing
As an insecticide
Magnesium keeps on burning in
N2
CO2
N2O
N2 as well as CO2
2 g oxygen contains number of atoms equal to that in
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