TS EAPCET (Engineering) p-Block Elements (Groups 15-18) — practice questions
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Practice TS EAPCET (Engineering) p-Block Elements (Groups 15-18) in the app →The general outer electronic configuration of group 15 elements is:Which of the following is **not** a noble gas?Among the halogens (F, Cl, Br, I), bond dissociation enthalpy is **lowest** for:The **inert pair effect** is most pronounced in:Boiling points of hydrogen halides follow which order?Which of the following has a **see-saw** molecular geometry around the central atom?According to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = Group 15 elements are collectively called which family?Which group 15 element is a gas at room temperature?An NH3 molecule has three bonds and one lone pair. What is its shape?Going down group 15, how does the stability of the hydrides change?Which is the only stable trihalide of nitrogen?Phosphorus shows the +1 oxidation state in which acid?What are binary compounds of group 15 elements collectively called?Arsenic, antimony and bismuth all share which crystal structure?In which group of the IUPAC system are the halogens placed?Which element is the most reactive of all elements?Teflon is made of fluorine bonded with which element?Who isolated fluorine in 1886 by electrolysis of KHF2 in liquid HF?Which halogen was found by Balard from brine treated with chlorine?Courtois discovered which halogen while treating seaweed ash?The Greek word bromos, the origin of bromine, means what?Iron heated with iodine gives which product?Hydrogen and chlorine react explosively only under what condition?H2 reacts with F2 explosively under which condition?For an interhalogen XYn, which value of n is NOT possible?Why are interhalogens usually more reactive than X2 except F2?Melting points of halogens rise down the group due to which force?Which halogen is the most abundant in seawater?Which gases have very low reactivity and form group 18?Under standard conditions the noble gases exist as what?Why are noble gases chemically unreactive?Who made the first noble gas compound, xenon hexafluoroplatinate?Which force holds noble gas atoms together in the liquid state?Which oxidation state is NOT shown by xenon in its compounds?Which noble gas is an s-block element?Which krypton compound is the most notable and easily characterised?The first stable argon compound reported in 2000 was which?Since 1988 IUPAC has recommended which group number for noble gases?Argon is used as a shielding gas in which process?Noble gas atoms trapped in crystal cavities form which compounds?Group 16 of the periodic system is also known as which family?Selenium and tellurium are obtained as byproducts of refining which metal?After fluorine, which element is the most electronegative?Which hydrogen chalcogenide is not toxic?What is the shape of the ozone molecule?What magnetic behaviour does the O2 molecule show?Ozone is made from dioxygen by the action of what?What is the colour of ozone gas?Compared with dioxygen, ozone is a much stronger what?How does the stability of ozone compare with that of O2?Which is NOT a method for making sulfuric acid?In the contact process, SO3 is absorbed in H2SO4 to form what?What is the usual concentration of concentrated sulfuric acid?Concentrated sulfuric acid absorbs water vapour from air. It is what?Sulfuric acid is most commonly used in making what?What was sulfuric acid called in antiquity?Nitric acid turns yellow with age because of what?Which process makes nitric acid industrially from ammonia?In the Ostwald process, ammonia burns to form which product?Nitric acid with more than 86% HNO3 is called what?How is ammonia made industrially on a large scale?At one atmosphere, what is the boiling point of ammonia?The name ammonia comes from which Egyptian deity?What are the colour and smell of ammonia gas?What is the molecular shape of phosphine, PH3?Technical grade phosphine smells like what?Which impurity makes phosphine spontaneously flammable?Which compound is a pnictogen hydride and is colourless and highly toxic?