MCQ 11 MarkWhich of the following shows most prominent inert pair effect ?ACBSiCGe✓PbAnswerCorrect option: D. PbPbView full question & answer→
MCQ 21 MarkThallium shows different oxidation state because ……………✓of inert pair effectBit is inner transition elementCit is metalDof its high electronegativityAnswerCorrect option: A. of inert pair effectof inert pair effectView full question & answer→
MCQ 31 MarkHaber’s process is used for preparation of ………….AHNO3✓NH3CNH2CONH2DNH4OHAnswerCorrect option: B. NH3NH3View full question & answer→
MCQ 41 Mark………… is inorganic graphite.AboraxBdiborane✓boron nitrideDcolemaniteAnswerCorrect option: C. boron nitrideboron nitrideView full question & answer→
MCQ 51 MarkWhich of the following is not an allotrope of carbon?AbuckyballBdiamondCgraphite✓emeraldAnswerCorrect option: D. emeraldemeraldView full question & answer→
MCQ 61 MarkWhich of the following is used as refrigerant?ANessler’s reagent✓Liq. ammoniaCBoraxDDiboraneAnswerCorrect option: B. Liq. ammonia(B) Liq. ammoniaView full question & answer→
MCQ 71 MarkThe catalyst used in Haber process contains …………..AnickelBpalladium✓ironDplatinumAnswerCorrect option: C. iron(C) ironView full question & answer→
MCQ 81 MarkIn Borax bead test, the coloured ions give characteristic coloured beads due to formation of …………….Ametal borates✓metal metaboratesCmetal phosphatesDmetal tetraboratesAnswerCorrect option: B. metal metaborates(B) metal metaboratesView full question & answer→
MCQ 91 Mark$3 c -2 e$ bonds are present in ............A$NH _3$✓$B _2 H _6$C$H _3 BO _3$D$SiCl _4$AnswerCorrect option: B. $B _2 H _6$(B) $B _2 H _6$View full question & answer→
MCQ 101 MarkIn white phosphorus, the P-P-P bond angle is ……………✓60°B90°C109.5D120°AnswerCorrect option: A. 60°(A) 60°View full question & answer→
MCQ 111 MarkWhite phosphorus contains discrete ............ molecules.A$P _5$✓$P _4$C$P _6$D$P_{52}$AnswerCorrect option: B. $P _4$(B) $P _4$View full question & answer→
MCQ 121 MarkThermodynamically stable allotrope of carbon is …………..Adiamond✓graphiteCbuckyballDall of theseAnswerCorrect option: B. graphite(B) graphiteView full question & answer→
MCQ 131 MarkAmong the group 13 elements, the property of allotropy is shown by ………………AindiumBaluminiumCthallium✓boronAnswerCorrect option: D. boron(D) boronView full question & answer→
MCQ 141 MarkCatenation is the ability of …………..Aatoms to form strong bonds with similar atomsBelements to form giant moleculesCan element to form multiple bonds✓an element to form long chains of identical atomsAnswerCorrect option: D. an element to form long chains of identical atoms(D) an element to form long chains of identical atomsView full question & answer→
MCQ 151 MarkWhich of the following is a stable halide of nitrogen?✓$NF_3$B$NCl_5$C$NF_5$D$NBr_5$AnswerCorrect option: A. $NF_3$$NF_3$View full question & answer→
MCQ 161 MarkThe reaction of $Al$ with $H _2 O$ produces $………$A$Al_2O_3$B$AlH_3$✓$Al(OH)_3$D$Al_2H_6$AnswerCorrect option: C. $Al(OH)_3$ $Al(OH)_3$View full question & answer→
MCQ 171 MarkWhich of the following is basic oxide?✓$Bi_2O_3$B$CO_2$C$B_2O_3$D$SiO_2$AnswerCorrect option: A. $Bi_2O_3$$Bi_2O_3$View full question & answer→
MCQ 181 MarkWhich one of the following statements about boron and aluminium is INCORRECT?ABoth exhibit oxidation state of +3.BBoth form oxides of the formula $M _2 O _3$.CBoth form trihalides, $M X_3$.✓Both form amphoteric oxides.AnswerCorrect option: D. Both form amphoteric oxides.(D) Both form amphoteric oxides.View full question & answer→
MCQ 191 Mark…………. cannot expand its octet due to absence of d orbital in its valence shell.AGa✓CCAsDGeAnswerCorrect option: B. C(B) CView full question & answer→
MCQ 201 MarkGroup oxidation state of group 15 elements is ……………A$+4$B$+1$C$+3$✓$+5$AnswerCorrect option: D. $+5$(D)$+5$View full question & answer→
MCQ 211 MarkThe stability of +3 oxidation state in aqueous solution is in order ……………✓Al > Ga > In > TlBTl > In > Ga > AlCAl > Tl > Ga > InDTl > Al > Ga > InAnswerCorrect option: A. Al > Ga > In > Tl(A) Al > Ga > In > TlView full question & answer→
MCQ 221 Mark………… is the most electronegative element of group 14.✓CarbonBSiliconCGermaniumDTinAnswerCorrect option: A. Carbon(A) CarbonView full question & answer→
MCQ 231 MarkOn moving down the group 14, the ionization enthalpyAincreases slightly from Si to Sn and decreases slightly from Sn to PbBincreases throughout uniformly from Si to PbCdecreases throughout uniformly from Si to Pb✓decreases slightly from Si to Sn and increases slightly from Sn to PbAnswerCorrect option: D. decreases slightly from Si to Sn and increases slightly from Sn to Pb(D) decreases slightly from Si to Sn and increases slightly from Sn to PbView full question & answer→
MCQ 241 MarkAmong the group 13 elements, melting point is highest for …………..✓BBAlCGaDInAnswerCorrect option: A. B(A) BView full question & answer→
MCQ 251 MarkWhich of the following is NOT a metalloid?AB✓SnCGeDSbAnswerCorrect option: B. Sn(B) SnView full question & answer→
MCQ 261 MarkThe group 15 element having inner electronic configuration as of argon is …………..APhosphorus (Z = 15)BAntimony (Z = 51)✓Arsenic (Z = 33)DNitrogen (Z = 7)AnswerCorrect option: C. Arsenic (Z = 33)(C) Arsenic (Z = 33)View full question & answer→
MCQ 271 Mark………… has noble gas core plus 14 f-electrons and 10 d-electrons.AGalliumBIndium✓ThalliumDBoronAnswerCorrect option: C. Thallium(C) ThalliumView full question & answer→
MCQ 281 MarkThe electronic configuration of boron family is $.……$A$ns^2 np^2$B$ns^2 np^5$C$ns^2 np^6$✓$ns^2 np^1$AnswerCorrect option: D. $ns^2 np^1$$ns^2 np^1$View full question & answer→