Bihar Board Class 12 (Science) p-Block Elements — practice questions
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Practice Bihar Board Class 12 (Science) p-Block Elements in the app →Among the 3d-series transition metals, the element that exhibits the largest number of oxidation states is:The 'spin only' magnetic moment $\mu$ (in Bohr magnetons) of a transition metal ion with $n$ unpaired d-electrThe spin-only magnetic moment of $\mathrm{Fe}^{3+}$ (ground state) is approximately:Highest oxidation states of transition metals are typically observed only in their:How many valence electrons does each group 13 element have?Which collective name is used for group 13 elements?Which group 13 element is a metalloid rather than a metal?Compounds of boron with hydrogen are calledAluminium oxide, Al2O3, is classed asWhich group 13 oxide is the most basic?Group 13 halides usually have the general formulaWhich group 13 element is not soft?Stability of the +1 state in heavy group 13 elements is due toIn boron and aluminium, the most stable oxidation state isThe two stable isotopes of boron areThallium is named after the colour of its spectral line, which isIndium was named after a spectral line of which colour?Gallium is named after which country?The name boron comes from the word for which mineral?The main ore of aluminium isAluminium's rank by abundance among all elements in the crust isBorosilicate glass is valued mainly for itsWhich gallium compound is used in semiconductors and solar cells?Thallium sulfate has been used mainly as aA noticeable effect of thallium poisoning, even at tiny doses, isAluminium's high affinity for oxygen makes it a powerfulWhich group 13 element was discovered in 1875?Group 14 alkyls of formula QR4 are described asWhich carbon group element sublimes at standard pressure?Down group 14, boiling points generallyWhich group 14 element has the highest density?Silicon and germanium crystallise in which structure?Which carbon allotrope has its atoms folded into a sphere?In tin pest, cold beta-tin slowly changes intoBelow about what temperature does beta-tin convert to alpha-tin?The half-life of carbon-14 is aboutWho isolated germanium after the 1885 mineral find?The name silicon comes from Latin silex, meaningThe chemical symbol Pb for lead comes from the Latin wordBronze is an alloy of copper andAbout 80% of all lead produced is used inWhich lead compound was once added to gasoline?The most commonly mined ore of lead isTin is produced by heating its mineral cassiterite withSilicon can be produced by heating silica withWhich element replaced germanium in semiconductors in the 1950s?Diatoms build their cell walls fromAdding a little germanium to silver makes the silverCrystalline silicon at room temperature appearsThe word halogen meansIn IUPAC numbering, the halogens form groupWhich group has elements in all three main states at STP?Who first isolated fluorine, in 1886?Scheele made chlorine in 1774 by heating HCl withCourtois discovered iodine while processingAstatine is usually produced by alpha bombardment ofThe Greek root of the name bromine refers toWhich is the only element more electronegative than oxygen?With traces of water, fluorine attacks glass to formFluorine forms strong bonds to other atoms but weak bonds inWhich halogen reacts explosively with hydrogen even when dark and cold?Chlorine reacts explosively with hydrogen only in the presence ofWhich hydrogen halide forms hydrogen bonds?Which hydrohalic acid is a weak acid in water?When iron reacts with iodine, the product isIn interhalogens XYn, the value of n can beInterhalogens are more reactive than most halogens because their bonds areHumans need trace iodine to make the hormoneFluorine reacts vigorously with water to give HF andChlorine dissolved in water forms hydrochloric acid andIodine dissolves in aqueous KI because it forms theThe active ingredient of most fabric bleaches isHalogen lamps use a filament made ofWhich atom has the highest electron affinity?Tennessine was made by bombarding berkelium-249 withThe high reactivity of halogens is mainly due to their