Multiple Choice QuestionsThe IE of hydrogen atom is 13.6 eV. The energy required to remove an electron in the n = 2 state of the hydrogen atom is
27.2 eV
13.6 eV
6.8 eV
3.4 eV
When conc. H2SO4 comes in contact with sugar, it becomes black due to
hydrolysis
hydration
decolourisation
dehydration
The complex [Co(ONO)(NH3)5]SO4 is named as
nitropentamminecobalt (III) sulphate
nitropentamminecobalt (II) sulphate
nitritopentamminecobalt (III) sulphate
pentamminenitritocobalt (III) sulphate
Prussian blue is formed when
ferrous sulphate reacts with FeCl3
ferric sulphate reacts with K4[Fe(CN)6]
ferrous ammonium sulphate reacts with FeCl3
ammonium sulphate reacts with FeCl3
IUPAC name of the following compound is
2-cyclohexylbutane
2-phenylbutane
3-cyclohexylbutane
3-phenylbutane
Which are isomers?
Methanol and methoxymethane
Ethanol and ethoxyethane
Propionic acid and ethyl acetate
Propionaldehyde and acetone
The compound X(C5H8) reacts with ammoniacal AgNO3 to give a white precipitate and reacts with excess of KMnO4 to give the acid, (CH3)2CH-COOH. Therefore, X is
CH2 = CH - CH = CH- CH3
CH3(CH2)2C ≡ CH
(CH3)2CH.C ≡ CH
(CH3)2C = C = CH2
If we mix a pentavalent impurity in a crystal lattice of Ge, what type of semiconductor formation will occur?
p-type
n-type
Both (a) and (b)
None of these
B.
n-type
When a pentavalent impurity is mixed in a crystal lattice of Ge, it will occupy some of the lattice sites. Four out of five electrons of impurity form bonds with the four neighbouring Ge atoms. The fifth electron is extra and is responsible for the conductivity of crystal. Since, the conductvity is due to negatively charged electrons, the semiconductor so obtained is called n-type semiconductor.
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