If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains
all reactants
mostly reactants
mostly products
similar amounts of reactants and products
C.
mostly products
For a reaction,
So, mostly the product will be present in the equilibrium mixture.
Magnetic moment 2.84 BM is given by (At. no. Ni= 28, Ti= 22, Cr=24, Co = 27)
Ni2+
Ti3+
Cr3+
Co2+
A.
Ni2+
The angular momentum of electrons in d orbital is equal to
0 h
A.
Angular momentum of electrons in d- orbital is
Which of the following statements is correct for a reversible process in a state of equilibrium?
ΔG = 2.303RT log K
ΔG0 = -2.303RT log K
ΔG0 = 2.303RT log K
C.
ΔG0 = -2.303RT log K
ΔG =ΔG0+2.303RT log K log Q
At equilibrium when Δ G = 0 and Q = K
then ΔG = ΔG0 +2.303 RT log K = 0
ΔG0 = -2.303 RT log K
Solubility of the alkaline earth's metal sulphates in water decreases in the sequence
Mg>Ca>Sr>Ba
Ca>Sr>Ba>Mg>
Sr>Ca>Mg>Ba
Ba>Mg>Sr>Ca
A.
Mg>Ca>Sr>Ba
The solubility of the sulphates. The sulphates becomes less soluble as you fo down the group i.e
Mg> Ca>Sr> Ba
The magnitude of the lattice energy remains almost constant as the size of the sulphate ion is so big that small increase in the size of the cation from Be to Ba does not make any difference. However, the hydration energy decreases from Be2+ to Ba2+ appreciably as the size of the cation increases down the group. The significantly high solubility of MgSO4 is due to high enthalpy of solvation on the smaller Mg2+ ions.
Which of the following species contains an equal number of σ and Π bond?
HCO3-
XeO4
(CN)2
CH2(CN)2
B.
XeO4
Structure |
σ and Π |
|
σ bond -4 |
|
σ bond -4 |
|
σ bond -3 |
|
σ bond -6 |
Which of the following pairs of ions are isoelectronic and isostructural?
D.
Isostructural chemical compounds have similar chemical structures.
Isoelectronic terms refer to two atom, ions or molecules that have the same number of valence electrons.
ClO3- = SO32-
Number of electrons
CO32- = 6+2+24 =32
SO32- = 16+2+24 = 32
ClO32- = 17+24+1 = 42
NO32- = 7+2+24 = 33
Hence ClO32- and SO32- are isoelectronic and are pyramidal in shape.
The number of d- electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following?
S- electronic in Mg (Z=12)
p-electrons in Cl( Z=17)
d- electrons in Fe (Z=26)
p-electrons in Ne (Z=10 )
B.
p-electrons in Cl( Z=17)
Electronic configuration of Fe2+ is [Ar]3d6 4s0
therefore, Number of electrons = 6
Mg- 1s2 2s2 2p6 (6s electrons)
It matches with the 6d electrons of Fe2+
Cl- 1s2 2s2 2p6 3s2 3p5 (11 p electrons)
It does not match with the 6d electrons of Fe2+
Fe- [Ar] 3d6 4s2 (6d electrons)
It does not match with the 6d electrons of Fe2+
Ne- 1s2 2s2 2p6 3s2 3p 6 (6p electrons)
It matches with the 6d electrons of Fe2+.
Hence, Cl has 11 p electrons which do not match in number with 6d electrons of Fe2+
The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-11, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?
AgI
AgCl
AgBr
Ag2CrO4
D.
Ag2CrO4
The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
Ar < K+< Ca2+
Ca2+ < Ar < K+
Ca2+ < K+ < Ar
K+< Ar < Ca2+
B.
Ca2+ < Ar < K+
Ca2+ < K+ < Ar
Ar, K+ and Ca2+ are isoelectronic i.e with the same number of electrons, 18. For isoelectronic species, ionic radii decrease with increases in effective (relative) positive charge. Also Ar, K and Ca belong to the same period.
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