TS EAPCET (Engineering) Boron Group — practice questions
53 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice TS EAPCET (Engineering) Boron Group in the app →Why is the boron family called the triels?Which element is the second hardest of all, exceeded only by diamond?After boron at 2076 °C, which group 13 element melts highest, at 660 °C?Boron is generally unreactive with many elements except under what condition?What is the simplest borane, a hydride of boron?What is the nature of boron oxide, B2O3?Thallium(III) oxide decomposes above which temperature?Down group 13, the oxides change in nature from acidic to what?Group 13 elements usually form halides of which general formula, with M the element?Which effect makes the +1 state common among the heavier group 13 elements?Which oxidation state is the most stable for thallium?Which of these has only one stable isotope?In which year did Humphry Davy extract boron by electrolysis?What name did Humphry Davy give to boron?Who first made a rather impure form of aluminium in 1825?Thallium is named from a Greek word meaning what?Gallium's name comes from Latin Gallia, meaning which country?Which element, found in 1875, had Mendeleev predicted six years earlier?Which is the most abundant metal in the Earth's crust?About what percentage of Earth's crust is aluminium?Which country accounts for about 70% of world boron extraction?Boron makes up roughly what fraction of Earth's crust?Gallium's abundance on Earth is about how many ppm?Borosilicate glass resists what far better than regular glass?Why is aluminium particularly useful for canning food?Aluminium is a powerful reducing agent due to its high affinity for what?What takes 70% of indium production, often as indium tin oxide?Which thallium compound is an outstanding vermin-killer?What is the most noticeable effect of thallium poisoning?Which group 13 element is described as extremely toxic?In plants, boron is used mainly for which purpose?How many hydrogen atoms bridge the two borons in diborane?Compared with terminal B-H bonds, the bridging B-H bonds in diborane are?The boron to terminal hydrogen bonds in diborane are which type?Industrial diborane is made by reducing which boron compound?Burning diborane in oxygen gives water and which boron compound?Diborane adds to alkenes in hydroboration to form what?What is the formula of digallane, the gallium analogue of diborane?How many moles of H2 form when 1 mol of B2H6 reacts fully with water?Which is the traditional decahydrate formula of borax?Dissolved in water, borax gives which kind of solution?Molten borax dissolves metal oxides to form glasses, used in which test?Borax is used as a primary standard in which type of titration?What is tincal, a name used in the history of borax?Which metalworking use is listed for borax?Which is the formula of orthoboric acid?Three oxygen atoms form what geometry around boron in boric acid?What holds the layers of B(OH)3 molecules together in boric acid crystals?Who first prepared orthoboric acid from borax?Hydrolysis of BCl3 gives boric acid and which other product?What is the primary industrial use of boric acid?Which role does boric acid play with neutrons?Boric acid is prepared by treating borax with what type of reagent?