DF BLOCK Flashcards
Which of the following 3d metal ion will give lowest enthalpy of hydration when dissolved in water?
1) Cr(2+)
2) Mn(2+)
3) Fe(2+)
4) Co(2+)
Mn(2+)
German silver is an alloy of
Zinc,copper and nickel
Caste iron is used to manufacture wrought iron(True or False)
True
Bronze is an alloy of
Copper and Tin
Gun metal is also known as
Red brass which is a type of bronze
Composition of gun metal
Cu, Sn, Zn
Is Mn3O4 magnetic?
Yes
Common positive oxidation states of chromium?
+2, +3, +6
Which of the following has positive electrode potential?(M2+/M)
1)Co
2)Zn
3)Cu
4)Fe
Cu
Density order of Cr, Fe,Co,Cu,Zn?
Zn<Cr<Fe<Co<Cu
Electronic configuration of Pt
[Xe]4f(14) 5d(9) 6s(1)
Melting of Ag is greater than Cs(T/F)
True
Interstitial compounds are chemically reactive
False
Interstitial compounds have metallic conductivity
True
Interstitial compounds are very hard
True
Interstitial compounds have high melting points
True
Order of first ie of Ti, Mn, Ni, Zn
Ti <Mn<Ni<Zn
Transition element having lowest enthalpy of atomisation?
1) V
2) Zn
3) Fe
4) Cu
Zn
Zn metal and NaOH produce H2 gas(t/f)
True
Cu metal and conc HNO3 produce H2 gas
False
Au metal in presence of NaCN produce H2 gas
False
Fe metal and conc HNO3 produce H2 gas?
False
Which of the following species is stable in aqueous solution?
1) Cr(2+)
2) MnO4(2-)
3) MnO4(3-)
4) Cu+
MnO4(2-)
Colour of KMnO4 is due to?
L–> M charge transfer transition
Charge transfer from O to Mn which temporarily reduces oxidation of Mn from +7 to +6
A pink coloured solution turns blue on heating. Presence of which cation?
Co(2+)
Stability in aqueous solution
Co(3+) <Fe(3+)<Cr(3+)<Sc(3+)
True
Highest value for E of M3+/M2+
1 Co
2Cr
3Mn
4Fe
Co
Ferrous oxide is more basic, less volatile, more ionic and less easily hydrolysed than ferric oxide
True
Colour absorbed by aqueous solution of CuSO4
Orange red
CeO2 can be used for oxidation of aldehydes and ketones
True
Aqueous solution of EuSO4 is a strong reducing agent.
True
Size of Bk(3+) ion is less than Np(3+) ion.
True
Due to actinoid contraction
Holmium electronic configuration
Xe 4f(11) 6s(2)
Electronic configuration of Np
[Rn]5f(4) 6d(1) 7s(2)
Gadolinium electronic configuration
[Xe]4f(7) 5d(1) 6s(2)
Order of atomic sizes
Ce>Sn>Yb>Lu
Increasing order on ionic radii of trivalent ions
Yb<Pm<Ce<La
True
Bonding in compounds of Ln(III) ions is predominantly ionic
True
Mo and W have similar atomic radii
True
Highest oxidation states of Uranium and Plutonium are 6 and 7 respectively
True
Eu doesn’t show +4 oxidation state
True
S1: HgS doesn’t dissolve in hot Dil HNO3
S2: PbS, CuS and CdS dissolve in hot Dil HNO3
Both are true
Conc HCl + KMnO4 gives Cl2 at room temperature
True
Silver nitrate leaves behind a metal on strong heating
True
