Which animal reptiles exist in the Permian periods of Paleozoic era?

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#Question id: 19773

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Bohr’s model of atom is not in agreement with

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#Question id: 19774

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Which of the following statements is correct?

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#Question id: 19775

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Which experimental observation correctly account for the phenomenon?

Experimental observation                                 Phenomenon

(A) X-rays spectra                                              Charge on nucleus

(B) alpha -particle scattering                           Quantized electron orbit .

(C) Photoelectric effect                                      The nuclear atom

(D) Emission spectra                                         Quantization of energy.

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#Question id: 19833

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Correct structure of SF₄ is

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#Question id: 19834

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Numbers of possible resonating structure of carbonate iong is....

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#Question id: 19835

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Which of the following molecule has not zero dipole movement ?