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How many unpaired electrons are present in Ni2+ cation (atomic number = 28):
(1) 0
(2) 2
(3) 4
(4) 6
Ans: 2
Why are the lanthanides and actinides series call the f-block
what are the examples?
The energy of an electron in orbit of hydrogen atom is : (1) 13.6/n 4 x eV (2) 13.6/n 3 xeV (3) 13.6/n 2 xeV (4)13.6/nx eV Ans:
How acidic character varies in s block elements
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The covalency of nitrogen in HNO 3 is: (1) 0 (2) 3 (3) 4 (4) 5 Ans: 5
Question: a) Briefly compare the windrow method v/s the aerated static pile composting b) Explain, with the help of a diagram, the role of aeration in turned windrow compos
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