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Practicing real exam questions helps you understand the exam pattern, improve accuracy, and boost your JEE score. Perfect for students aiming for top ranks in IIT-JEE.","tags","jee main joint entrance examination india","version","vip","location",{"_391":392,"_393":394},"type","Point","coordinates",[395,396],79.0888,21.1466,"in","priority",12,"createdOn",1756744302186,"updatedOn","questionsCount",24748,"courseCount",9,"examKey","questionData",{"_369":410,"_411":412,"_413":414,"_278":416,"_417":418,"_263":370,"_419":420,"_421":422,"_110":427},"Rq5yjISEbZ0XBbrlaZhaOdcF3j6zH4","q","Which one of the following lanthanoids does not form MO₂? [M is lanthanoid metal]","ans",[415],2,"2021 - 26th February Morning Shift","course","chemistry","exp","Nd (60) = 4f⁴ 6s²

\nPr (59) = 4f³ 6s²

\nDy (66) = 4f¹⁰ 6s²

\nYb (70) = 4f¹⁴ 6s²

\nYb⁺² has fully-filled 4f orbital, it will require very\nlarge amount of energy to reach +4 oxidation\nstate.","opts",[423,424,425,426],"Nd","Dy","Yb","Pr",7,"7","initComment","initReply","actionData","errors"]

JEE MAIN - Chemistry (2021 - 26th February Morning Shift - No. 7)

Explanation

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