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Which of the following compounds are covalent:
(1) H2
(2) CaO
(3) KCL
(4) Na2S
Ans: H2
what is the equivalent weight of Ca in Ca3(PO4)2?
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The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is: (1) Eight (2) Six (3) Three
what is the working principle of polarography
Because Nucleus is composed of protons and neutrons..
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