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Q. Show the Occurrence of Metals? Earth's crust and sea are the two main sources of metals. In the earth's crust metals occur both in the combined state in the form of minerals
In a Bohr's model of atom when an electron jumps from n= 1 to n= 3 , how much energy will be emitted or absorbed: (1) 2.15 x10 -11 erg (2) 0.19
Which of the following has more unpaired d-electrons: (1) Zn + (2) Fe 2+ (3) N 3+ (4) Cu + An
What volume of oxygen would be required to burn completely 200 ml of acetylene and what would be the volume of carbon dioxide formed?
discuss the structure of beryllium chloride Becl2.
when H+ is removed from any compound it forms conjugate acid. the addition of H+ ion gives conjugate base.
150ml of a gas at 27C is heated to 77C at constant pressure.find the new volume of the gas.
Which of the following configuration is correct for iron : (1) 1s 2 , 2s 2, 2p 6 , 3s 2 , 3p 6 ,, 3d 5 (2) 1s 2 , 2s 2 , 2p 6 , 3s 2 ,3p 6 , 4s 2 , 3d 5 (3)
x(2x^-1/4)^4
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