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Question 7 : The purest form of silicon dioxide is---- silicates cristobalite silibolite rock crystal Question 8 : The following are crystaline forms of silica, except------------ tridymite quartz cristobalite Crystaamite Question 9 : Which of the group V elements give only one oxidation state? lead bismouth phosphorus nitrogen Question 10 : Which of the group V oxoacids is manufactured by Ostwald process? dinitrogen tetraoxide nitrous oxide nitric acid nitrogen hydroxide Question 11 : Which of these is true of interstitial carbide? they are non stoichiometric compound they are soluble compounds They are binary compounds they are amorphous compounds Question 12 : Which of the following is responsible for the easy hydrolysis of lead halides ? availability of lone pair of electron in P orbital completely filled d orbitals by electron Availability of d-orbitals and low bond energy of Pb-H bond availability of lone pair of electron in d orbital
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