CBSE Class 12 (Science) The d- and f-Block Elements — practice questions
113 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) The 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 d-block of the periodic table holds the groups:The f-block elements are shown in a separate panel at the:The d-block elements are commonly called the:The f-block elements are commonly called the:How many main series of transition metals are there?The 3d series of transition metals runs from:The 4f series of inner transition metals is called the:The 5f series of inner transition metals is called the:The name transition metals came from properties standing between:By the IUPAC definition a transition metal has an incomplete:Zinc, cadmium and mercury sit in which group?Transition metal ions are often noticed for being:Transition metals commonly show oxidation states that are:Transition metals combine with ligands to form:Besides catalytic action, transition metals are noted for behaviour:Transition metal d orbitals reach out to the atom's:The melting points of transition metals are generally:Atomic radii within a single transition series vary by an amount:Filling 4f before 5d causes a steady fall in radii called:Zirconium and hafnium have radii that are nearly:Zirconium measures 160 pm and hafnium measures about:Transition elements resemble each other most closely along a:Which group 12 triad is not regarded as transition metals by IUPAC?Zn, Cd and Hg are not true transition metals because they haveWhich 4d-series element has the outer configuration 4d10 5s0?The ground state outer configuration of chromium (Z = 24) isCopper is 3d10 4s1, not 3d9 4s2, mainly becauseMetals with a very high enthalpy of atomisation tend to beHeavier d-block metals show more frequentWhich first-row transition element does not show variable oxidation states?The only oxidation state shown by zinc isCompared with Cr(VI), the +6 state of Mo and W isThe oxidation state of nickel in Ni(CO)4 isWhich oxidation state of titanium is the most stable?IUPAC defines a transition metal as one with an incomplete d subshell inWhich aqueous M2+ ions are strong reducing agents that liberate hydrogen from dilute acid?Which 3d element has the highest third ionisation enthalpy?Oxygen outdoes fluorine in stabilising high oxidation states since itWhich 3d metal does not form an ionic oxide of the MO type?Which acid is derived from the acidic oxide Mn2O7?Chromium(III) oxide, Cr2O3, isWhich oxide of chromium is described as basic?Which vanadium oxide is amphoteric though mainly acidic?Sodium chromate is made by fusing which ore with sodium carbonate in excess air?Aqueous sodium chromate solution has which colour?Which acid is used to acidify sodium chromate to obtain sodium dichromate?Sodium chromate is acidified with which acid to get dichromate?On adding acid to a yellow chromate solution, the ion formed is theWhen chromate changes to dichromate in acid, the oxidation state of chromiumIn the dichromate ion, two CrO4 tetrahedra sharePotassium dichromate is used as a primary standard inPotassium dichromate finds important use in which industry?Acidified potassium dichromate oxidises iodides toFusing MnO2 with KOH and KNO3 gives dark greenManganate disproportionates in acid to give permanganate andIn the laboratory, a Mn(II) salt is oxidised to permanganate usingCrystals of potassium permanganate areKMnO4 crystals are isostructural with those ofWhen KMnO4 is heated at 513 K, it gives K2MnO4, MnO2 andThe green manganate ion is paramagnetic with how many unpaired electrons?HCl is unsuitable for permanganate titrations becauseIn neutral or faintly alkaline solution, permanganate oxidises iodide toAcidified permanganate oxidises Fe2+ to Fe3+ and is itself reduced toOxalate is oxidised by acidified permanganate at aboutAcidified permanganate oxidises hydrogen sulphide with precipitation ofThe lanthanoids are the fourteen elements that followThe actinoid series runs from thorium toThe most stable oxidation state of all the lanthanoids isThe overall decrease in size from lanthanum to lutetium is calledLanthanoid contraction is attributed toZr (160 pm) and Hf (159 pm) have almost equal radii because ofWhich two elements are hard to separate because of lanthanoid contraction?Which lanthanoid +4 ion is used as a good analytical reagent?Europium(II) in solution is a strongWhich lanthanoid is steel hard and melts at 1623 K?Which trivalent lanthanoid ions are colourless?The first ionisation enthalpies of the lanthanoids are aroundMischmetall, used for lighter flints, consists mainly ofMixed lanthanoid oxides are employed as catalysts inLawrencium (Z = 103) has a half-life of aboutThe actinoid contraction is greater from element to element because 5f electrons5f electrons take part in bonding more than 4f electrons because 5f orbitals areWhich transition metal compound catalyses the Contact process?Nickel is used as a catalyst inCompounds formed when small atoms like H, C or N sit inside metal lattices areInterstitial compounds of transition metals are chemicallyTransition metals form many complexes owing to small ions, high charge andParamagnetism in transition metal ions arises from the presence ofThe spin-only magnetic moment of Mn2+ (five unpaired electrons) is nearlySubstances that are attracted very strongly by a magnetic field are calledMany copper(I) compounds in aqueous solution undergoMetals that readily form homogeneous alloys have radii within about