MCQ 11 MarkWhich of the following lose electrons to form cations ?✓MetalsBNon-metalsCBoth a. and b.DNone of theseAnswerCorrect option: A. MetalsMetalsView full question & answer→
MCQ 21 MarkWhich among the following shows variable valency ?AZincBSodium✓IronDCalciumAnswerCorrect option: C. IronIronView full question & answer→
MCQ 31 MarkWhich of the following is a triatomic molecule ?AOxygenBSulphurCNitrogen✓OzoneAnswerCorrect option: D. OzoneOzoneView full question & answer→
MCQ 41 MarkThe symbol of radon isARa✓RnCRdDRoAnswerCorrect option: B. RnRnView full question & answer→
MCQ 51 MarkThe non-metal which is liquid at room temperature isAsulphurBchlorineCiodine✓bromineAnswerCorrect option: D. brominebromineView full question & answer→
MCQ 61 MarkWhich of the following is a metalloid ?ACopperBSilver✓GermaniumDLeadAnswerCorrect option: C. GermaniumGermaniumView full question & answer→
MCQ 71 MarkThe earth’s crust is made up mainly of oxygen andACarbonBphosphorus✓siliconDnitrogenAnswerCorrect option: C. siliconsiliconView full question & answer→