CBSE
Multiple Choice QuestionsWhen I2 is passed through KCl , KF and KBr solutions :
Cl2 and Br2 are evolved
Cl2 is evolved
Cl2 , Br2 and F2 are evolved
none of the above
For electron affinity of halogens which of the following is correct?
Br > F
F > Cl
Br > Cl
F > I
The correct order of solubility in water for He, Ne, Ar, Kr, Xe is :
He > Ne > Ar > Kr > Xe
Xe > Kr > Ar > Ne > He
Ne > Ar > Kr > He > Xe
Ar > Ne > He > Kr > Xe
At higher temperature, iodoform reaction is given by
CH3CO2CH3
CH3CO2C2H5
C6H5CO2CH3
CH3CO2C6H5
Which of the following compound is a tribasic acid ?
H3PO4
H3PO2
H3PO3
H4P2O7
The true statement for the acids of phosphorus, H3PO2, H3PO3 and H3PO4 is
the order of their acidity is H3PO4 > H3PO3 > H3PO2
all of them are reducing in nature
all of them are tribasic acids
the geometry of phosphorus is tetrahedral in all the three
Assertion : Sb2S3 is not soluble in yellow ammonium sulphide.
Reason : The common ion effect due to S2- ions reduces the solubility of Sb2S3.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
The element which forms oxides in all oxidation states +I to +V is
N
P
As
Sb
Assertion : Reaction of SO2 and H2S in the presence of Fe2O3 catalyst gives elemental sulphur.
Reason : SO2 is a reducing agent.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following does not have valence electron in 3d-subshell ?
Fe (III)
Cr (I)
Mn (II)
P (0)
