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Which of the following sequence is correct as per Aufbau principle:
(1) 3s < 3d < 4s < 4p
(2) 1s < 2p < 4s < 3d
(3) 2s < 5s < 4p < 5d
(4) 2s < 2p < 3d < 3p
Ans: 1s < 2p < 4s < 3d
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copper reacts with oxygen to form two oxide X and Y .On analysis 1.535g of X yielded 1.365g of copper and 1.450g of Y yielded 1.160g of copper. [I] determine the chemical formula o
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