MCQ
The rate constant of a first order reaction whose half-life is $ 480\,\sec$ , is
- A$2.88 \times {10^{ - 3}}\,{\sec ^{ - 1}}$
- ✓$1.44 \times {10^{ - 3}}\,{\sec ^{ - 1}}$
- C$1.44\,{\sec ^{ - 1}}$
- D$0.72 \times {10^{ - 3}}\,{\sec ^{ - 1}}$
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$(A)$ Line emission spectra are used to study the electronic structure
$(B)$ The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet
$(C)$ An absorption spectrum is like the photographic negative of an emission spectrum
$(D)$ The element helium was discovered in the sun by spectroscopic method
$(I) [FeF_6]^{-3}$
$(II) [V(H_2O)_6]^{+2}$
$(III) [Fe(H_2O)_6]^{+2}$