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Which is a better coolant, Freon 11 or Freon 12? why?
The f-block elements contains of two series of inner transition elements i.e. lanthanoids (the fourteen elements subsequent lanthanum) and actinoids (the fourteen elements subseque
It is important to differentiate the stoichiometric or empirical formula of a molecular substance from its molecular formula. The former expresses only the relative numbers of atom
what are binary compounds of hydrogen?describe briefly hydrides formed by alkali metals and halogen?
What is electromagnetism
Which of the following substances has covalent bonding: (1) Germanium (2) Sodium chloride (3) Solid neon (4) Copper Ans: Germanium
calculate the enthalpy of combustion for acetic acid using standard enthalpies of formation
The uncertainty in momentum of an electron is 1 x10 -5 kg- m/s . The uncertainty in its position will be (h= 6.62 x 10 -34 kg - m 2 / s): (1) 1.05 x 10- 28 m
Number of unpaired electrons in Mn 4+ is: (1) 3 (2) 5 (3) 6 (4) 4 Ans: 3
Silicon has 4 electrons in the outermost orbit. In forming the bonds: (1) It gains electrons (2) It loses electrons (3) It shares electrons (4) None of these Ans: I
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