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The electronic structure of four elements A, B, C, D are:
(1) 1s2
(2) 1s2, 2s2, 2p2,
(3) 1s2, 2s2, 2p5,
(4) 1s2, 2s2, 2p6
Ans: 1s2, 2s2, 2p5,
its preparation
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Explain the steps involved in the preparation of either potassium dichromate from sodium chromate or potassium permanganate from manganese dioxide.
50ml of 0.1M NH 4 OH ,25ml NH 4 Cl weere used to make a buffer . what is the PH is if Pk b is 4.8? Solution) The given buffer is a base buffer [NH4OH] =[(50*0.1)/75] [NH4Cl] =[(
A water treatment plant is to process 30,000 m3/d of raw water. A tapered flocculation basin having four flocculators with velocity gradients 40/sec, 30/sec, 20/sec and 10/sec is t
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why equilibrium state attainable from either way?
Which of the following is isoelectronic with carbon atom: (1) Na + (2) Al +3 (3) O 2- (4)N + Ans: N +
a sample of CaCo3 and MgCo3 weighing 192g is ignited to constanr weight of 104 gm . what is the composition of mixture ?
why is carbon valency four
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