multiple choice

JEE Mains 2015 Guidance › Inorganic Chemistry questions › multiple choice

1/ Which of the following metals have both valence and penultimate shell partially filled

A. Cr B.Mo C.Cu D.Zn

2/ Which wil give ammonia with water

A. Mg₃N₂ B.AIN C.CaCN₂ D.Ca(CN)₂

#Chemistry #Inorganic Chemistry

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4 Answers

govind ·2010-02-10 22:31:34

Qn. 1 --A,B
Qn. 2 --A,B will produce ammonia ..C produces NH₄OH dunno abt D

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lubu ·2010-02-10 22:38:00

1st one is right . Can u explain me please. 2nd one CaCN₂ will produce ammonia

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govind ·2010-02-10 22:43:32

see...write the configuration of all the elements
Cr 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
Mo ns¹ (n-1)d⁵
Cu 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰
Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰

So in case of Cr and Mo both valence and penultimate shells are partially filled..whereas in case of Cu valence shell is partially filled..in case Zn both shells are fully filled