General
✓✗Transition metals are
- hard, with high tensile strength and good thermal and electrical conductivity
- soft and low-melting
- non-conductors of electricity
- gases at room temperature
General
✓✗The common oxidation state of iron in its compounds that are most stable in air is
- +3
- 0
- +6
- +1
General
✓✗An ion of a lanthanoid has the maximum number of unpaired electrons possible for a 4f ion. The ion is
- Ce3+
- Yb3+
- Gd3+
- Lu3+
General
✓✗The colour of K2Cr2O7 is due to
- unpaired electrons on oxygen
- f−f transition
- d−d transition of Cr(VI)
- charge transfer, because Cr(VI) is d0
General
✓✗A magnetic moment of 2.84 BM is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)
- Cr2+
- Ni2+
- Ti3+
- Co2+
General
✓✗The oxidation states of Cr and Mn in CrO3 and Mn2O7 are, respectively,
- +3 and +4
- +3 and +7
- +6 and +7
- +6 and +6
General
✓✗Which of the following sets of ions act as oxidising agents?
- Ce4+ and Tb4+
- Eu2+ and Yb2+
- Eu2+ and Tb4+
- La3+ and Lu3+
General
✓✗Diamagnetic substances have
- two unpaired electrons
- one unpaired electron
- five unpaired electrons
- all electrons paired
General
✓✗When calomel reacts with NH4OH, we get
- Hg2O
- NH2−Hg−Hg−Cl
- HgO
- HgNH2Cl
General
✓✗The +1 oxidation state of copper is unstable in aqueous solution because Cu+(aq)
- is oxidised by water to Cu3+
- is reduced by water
- disproportionates into Cu2+ and Cu
- forms Cu2 molecules
General
✓✗The Eo(M3+/M2+) values (in V) are Ti −0.37, V −0.26, Cr −0.41, Mn +1.57, Fe +0.77, Co +1.97. Which ion is the strongest reducing agent in the +2 state?
- Co2+
- Fe2+
- Mn2+
- Cr2+
General
✓✗The ionisation enthalpy of transition elements increases only slowly across a series because
- electrons are added to the outermost s orbital
- the nuclear charge decreases
- the increase in nuclear charge is partly cancelled by the shielding of inner d electrons
- the atomic radius increases
General
✓✗In Ni(CO)4, the oxidation state of nickel is
- +2
- 0
- −2
- +4
General
✓✗An atom has the electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2. It belongs to
- group 15
- group 2
- group 5
- group 3
General
✓✗Statement I: Interstitial compounds retain metallic conductivity.
Statement II: Interstitial compounds have lower melting points than the pure metals.
Statement II: Interstitial compounds have lower melting points than the pure metals.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct