Bihar Board Class 12 (Science) d- and f-Block Elements — practice questions
97 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) d- and f-Block Elements in the app →Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** Ethylenediamine (en) is best described as a:The coordination number 6 most commonly gives which geometry?The IUPAC name of K3[Fe(CN)6] is:The drug CISPLATIN has the formula [Pt(NH3)2Cl2]. Its anti-cancer activity comes from the:In Valence Bond Theory, an octahedral LOW-SPIN complex like [Co(NH3)6]³⁺ uses which hybridisation?In Crystal Field Theory, the 5 d-orbitals in an OCTAHEDRAL field split into:In the spectrochemical series, which ligand is the STRONGEST field?The unusual stability of EDTA-metal complexes is mainly due to the:The biological molecule HAEMOGLOBIN contains which metal at its centre?A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or The COORDINATION NUMBER of the central metal in a complex isA ligand that has ONLY ONE donor atom (which forms a single bond to the central metal) is calledIn the complex $[\mathrm{Co(NH_3)_5\,Cl}]\mathrm{Cl_2}$, the oxidation state of cobalt isETHYLENEDIAMINETETRAACETATE (EDTA) is a famous polydentate ligand. It isThe IUPAC name of $[\mathrm{Co(NH_3)_6}]^{3+}$ isCis-trans isomerism is observed inCoordination compounds of transition metals are often COLOURED. CFT explains this colour as arising from$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in this complex isThe HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation stateWhich of the following coordination compounds shows OPTICAL ISOMERISM?The lanthanoid series is built up by the filling of which orbitals?Which 4d element has the outer configuration 4d10 5s0?Scandium (Z = 21) counts as a transition element because its ground-state atom has what?Silver atoms have a full 4d subshell. Why is silver still a transition element?What accounts for the high melting points of transition metals?In a transition row, melting points generally peak near which d configuration?Transition metals with very high enthalpies of atomisation tend to behave how?Why do 4d and 5d metals often form metal-metal bonds?What favours the mid-series peak in atomisation enthalpy?Why do same-charge ions shrink across a d series?Zirconium and hafnium have almost the same atomic radius. Which effect causes this?How does density change from titanium to copper in the 3d series?How does the change in ionisation enthalpy along a transition series compare with a non-transition period?When a d-block element forms a cation, which electrons are removed first?Why is the third IE of Fe lower than that of Mn?Why does first ionisation enthalpy rise only slightly across the 3d series?What is the lowest common oxidation state of the 3d transition metals?Manganese shows every oxidation state within which range?Which 3d element does not show variable oxidation states?Going down group 6 from Cr to W, how does the stability of the +6 state change?Low oxidation states such as zero are stabilised by ligands with what property?Copper does not liberate hydrogen from dilute HCl. Which property explains this?Which acid can dissolve copper metal?Why is E(Ni2+/Ni) more negative than expected?Which pair of 3d M3+ ions are the strongest oxidising agents in water?Both Cr2+ and Mn3+ are d4, yet Cr2+ is reducing. What makes Cr2+ reducing?Why is the E value for Mn3+/Mn2+ much more positive than for Cr3+/Cr2+?Which copper(II) halide is unknown because Cu2+ oxidises the anion?Why is Cu2+(aq) more stable than Cu+(aq)?Manganese's highest oxide is Mn2O7 but its highest fluoride is MnF4. Why does oxygen do better?Which oxide of manganese is a covalent green oil?As the oxidation number of a transition metal in its oxide rises, what happens to ionic character?What is the acid-base nature of V2O5?Paramagnetism in transition metal ions arises from what?What is the magnetic moment of a single unpaired electron?A chemist measures the spin-only moment of Mn2+ (3d5). What value is expected?An aqueous 3d ion shows a spin-only moment of 3.87 BM. Which ion could it be?Why does the spin-only formula work for 3d ions?The colour seen for a transition metal ion corresponds to what?In transition metal ions, colour comes from which electronic change?Why do transition metals form so many complexes?Transition metal catalysis is mainly linked to what?Which catalyst is used in the Contact process for sulphuric acid?Which metal catalyses the hydrogenation of fats?Which silver compound is valued in photography for its light sensitivity?Interstitial compounds form when which atoms are trapped in metal lattices?Homogeneous alloys form readily when metallic radii differ by no more than about what?In acidic solution, manganate(VI) disproportionates into which pair?Why is K2Cr2O7 made by adding KCl to sodium dichromate solution?Potassium dichromate is an important chemical in which industry?Fusing MnO2 with KOH and an oxidant first gives which dark green product?In the laboratory, a manganese(II) salt is oxidised to permanganate by which reagent?Which is correct about manganate and permanganate ions?How many electrons does one MnO4- ion gain when reduced to Mn2+ in acid?Why are permanganate titrations unsatisfactory in hydrochloric acid?Why does cerium readily form a +4 state?Ce(IV) could oxidise water, yet it is a useful analytical reagent. Why?Eu2+ readily changes to Eu3+. What role does Eu2+ therefore play?Which lanthanoid ion has a half-filled 4f set and acts as an oxidant?Which lanthanoid behaves like europium in showing both +2 and +3 states?Which pair of trivalent lanthanoid-series ions is colourless?With rising atomic number, lanthanoid chemistry shifts from calcium-like to resembling which metal?Mischmetall is about 95 percent lanthanoid metal plus about 5 percent of which element?Mixed lanthanoid oxides serve as catalysts in which process?Why do 5f electrons take part in bonding more than 4f electrons?How does actinoid contraction compare with lanthanoid?Why do actinoids show a wider range of oxidation states than lanthanoids?Which actinoid reaches a maximum oxidation state of +7?Across the lanthanide series, the radius of the M3+ ion falls over roughly which range?Why are zirconium and hafnium found together in nature and hard to separate?The name transition metals first referred to properties transitional between which blocks?Which ore is used to prepare potassium permanganate?Which ore is fused with sodium carbonate to make sodium chromate?Colour of trivalent lanthanoid ions is attributed to what?Which property is shared by all the actinoid elements?What is the general oxidation state shown by the actinoids?