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.
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
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
For electron affinity of halogens which of the following is correct?
Br > F
F > Cl
Br > Cl
F > I
Which of the following does not have valence electron in 3d-subshell ?
Fe (III)
Cr (I)
Mn (II)
P (0)
At higher temperature, iodoform reaction is given by
CH3CO2CH3
CH3CO2C2H5
C6H5CO2CH3
CH3CO2C6H5
Which of the following is arranged in the increasing order of enthalpy of vaporization?
NH3, PH3, AsH3
AsH3, PH3, NH3
NH3, AsH3, PH3
PH3, AsH3, NH3
Assertion: HClO4 is a stronger acid than HClO3.
Reason : Oxidation state of Cl in HClO4 is +8 and in HClO3 +5.
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.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
Greater the number of negative atoms present in the oxy-acid make the acid stronger. In general, the strengths of acids that have general formula, (HO)mZOn can be related to the value of n. As the value of n increases, acidic character also increases. The negative atoms draw electrons away from the Z-atom and make it more positive. The Z-atom, therefore, becomes more effective in withdrawing electron density away from the oxygen atom that bonded to hydrogen. In turn, the electrons of H-O bond are drawn more strongly away from the H-atom. The net effect makes it easier from the proton release and increases the acid strength.