MCQ 11 MarkThe correct electronic configuration of potassium is ______.A2,8,9B2,8,1C2,8,8,1D2,8,8,3AnswerThe correct electronic configuration of potassium is 2,8,8,1View full question & answer→
MCQ 21 MarkThe number of protons, neutrons and electrons present respectively in ${ }_{35}^{80} Br$ areA80, 80, 35B35, 55,80C35, 35, 80D35, 45, 35Answer35, 45, 35View full question & answer→
MCQ 31 MarkThe term nucleons refer to ______.Aprotons and electronsBonly neutronsCelectrons and neutronsDprotons and neutronsAnswerThe term nucleons refer to protons and neutrons.View full question & answer→
MCQ 41 MarkChange in the number of neutrons in an atom changes it to ______.Aan ionBan isotope.Can isobarDanother elementAnswerChange in the number of neutrons in an atom changes it to an isotope.View full question & answer→
MCQ 51 MarkAmong the following the odd pair isA${ }_8^{18} O ,{ }_9^{19} F$✓${ }_{18}^{40} Ar ,{ }_7^{14} N$C${ }_{14}^{30} Si _{,}{ }_{15}^{31} P$D${ }_{20}^{40} Cr ,{ }_{19}^{39} K$AnswerCorrect option: B. ${ }_{18}^{40} Ar ,{ }_7^{14} N$${ }_{18}^{40} Ar ,{ }_7^{14} N$View full question & answer→
MCQ 61 MarkIf the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p1’then it will occupy ……………… block of the periodic table.As✓pCdDfAnswerCorrect option: B. ppView full question & answer→
MCQ 71 MarkWhich of the following metal (s) do not react with water?AGoldBSilverCCopper✓All the aboveAnswerCorrect option: D. All the aboveAll the aboveView full question & answer→
MCQ 81 MarkWhich of the following metals have low melting and boiling point?ASodium :BPotassiumC(e) Iroñ✓Both a & bAnswerCorrect option: D. Both a & bBoth a & bView full question & answer→
MCQ 91 MarkWhich of the following non-metals can form alloys with metals?ABoronBCarbonCSiliconDAll the aboveAnswerall the aboveView full question & answer→
MCQ 101 MarkWhich block of the periodic table contains metals, non-metals and metalloids?As✓pCdDfAnswerCorrect option: B. ppView full question & answer→
MCQ 111 Markd-block elements are otherwise known as _________ .✓transition elementsBinner transition elementsChalogensDalkali metalsAnswerCorrect option: A. transition elementstransition elementsView full question & answer→
MCQ 121 MarkThe maximum number of electrons that can be accommodated in s, p ,d, and f subshells are _________ .A14, 10, 6, 2B6, 10, 2, 14✓2, 6, 10, 14D6, 2, 14, 10AnswerCorrect option: C. 2, 6, 10, 142, 6, 10, 14View full question & answer→
MCQ 131 MarkGroup 16 elements are collectively called as _______ .✓chalcogen familyBcarbon familyC(e) halogensDnitrogen familyAnswerCorrect option: A. chalcogen familychalcogen familyView full question & answer→
MCQ 141 MarkNoble gases are placed in the _______ group in the modern periodic table.A13thB18thC17thD2ndAnswerl8thView full question & answer→