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question_answer1) Among PbS, CuS, HgS, MnS, CoS, \[B{{i}_{2}}{{S}_{3}}\] , \[Sn{{S}_{2}}\] How many ore black in colour \[\to \]
question_answer2) How many of the following given white ppt will dil. HCl - \[P{{b}^{+2}}\], \[B{{a}^{+2}}\], \[M{{n}^{+2}}\], \[Z{{n}^{+2}}\], \[A{{g}^{+}}\], \[Hg_{2}^{+2}\]
question_answer3) How many of the following given ppt with \[{{H}_{2}}S\] in the presence of HCl \[C{{u}^{+2}}\], \[A{{s}^{+3}}\], \[Z{{n}^{+2}}\], \[F{{e}^{+2}}\], \[A{{l}^{+3}}\], \[N{{a}^{+}}\], \[B{{i}^{+3}}\], \[C{{d}^{+2}}\]
question_answer4) Which of the following does not given precipitate when excess of \[N{{H}_{4}}OH\] is added - \[P{{b}^{+2}}\], \[A{{g}^{+}}\], \[Z{{n}^{+2}}\], \[C{{u}^{+2}}\], \[N{{i}^{+2}}\], \[F{{e}^{+3}}\], \[A{{l}^{+3}}\], \[H{{g}^{+2}}\], \[Hg_{2}^{+2}\]
question_answer5) How many salts upon heating does not given any residue - \[N{{H}_{4}}Cl\], \[NaN{{O}_{3}}\], \[N{{H}_{4}}N{{O}_{3}}\], \[N{{H}_{4}}N{{O}_{2}}\], \[CuS{{O}_{4}}.5{{H}_{2}}O\] , \[FeS{{O}_{4}}.7{{H}_{2}}O\] , \[AlC{{l}_{3}}\left( s \right)\]
question_answer6) Radicals belongs to fourth group of basic radical, \[A{{l}^{+3}}\], \[F{{e}^{+3}}\], \[N{{i}^{+2}}\], \[Z{{n}^{+2}}\], \[S{{r}^{+2}}\], \[C{{a}^{+2}}\], \[C{{o}^{+2}}\], \[M{{n}^{+2}}\]
question_answer7) \[\underset{Black}{\mathop{X\left( S \right)}}\,\xrightarrow{dil\,HCl}Y\uparrow \xrightarrow[NaOH]{N{{a}_{2}}\left[ Fe{{\left( CN \right)}_{5}}\left( NO \right) \right]}\] Purple solution gas Y has been allowed to react with following species in neutral/acidic medium: (a) \[FeC{{l}_{3}}\] (b) \[CuS{{O}_{4}}\] (c) \[BaC{{l}_{2}}\] (d) \[S{{O}_{2}}\] (e) \[C{{r}_{2}}O_{7}^{2-}\] (f) \[C{{H}_{3}}COONa\] (g) \[Hg_{2}^{2+}\] Then calculate value of \[\left( P+Q-R \right)\] P: Number of species which undergoes redox reaction with gas Y. Q: Number of species with which gas Y undergoes precipitation. R: Number of species with which gas Y produce no observable change.
question_answer8) Consider the following reaction \[N{{a}_{3}}P{{O}_{4}}+{{\left( N{{H}_{4}} \right)}_{2}}Mo{{O}_{4}}+HN{{O}_{3}}\left( dil. \right)\to 'X'\] (canary yellow ppt) Then calculate total number of atoms of 15th group elements which are \[s{{p}^{3}}\] hybridized in compound \['X'\] .
question_answer9) An aqueous solution of contains \[H{{g}^{2+}}\], \[Hg_{2}^{2+}\], \[P{{b}^{2+}}\] and \[C{{d}^{2+}}\]. Out of these, how many ions will produce white precipitate with dilute HCl?
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