Day 422: JEE Mains Chemistry

1. A.
   $1.187\text{ }g{CaCO}_{3} + 1.023\text{ }g{MgCO}_{3}$
2. B.
   $1.023\text{ }g{CaCO}_{3} + 1.023\text{ }g{MgCO}_{3}$
3. C.
   $1.187\text{ }g{CaCO}_{3} + 1.187\text{ }g{MgCO}_{3}$
4. D.
   $1.023\text{ }g{CaCO}_{3} + 1.187\text{ }g{MgCO}_{3}$

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1. A.
   An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state
2. B.
   An atom can take only certain distinct energies $E_{1},E_{2},E_{3}$, etc. These allowed states of constant energy are called the stationary states of atom
3. C.
   When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light
4. D.
   The electron in a H atom's stationary state moves in a circle around the nucleus

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1. A.
   3
2. B.
   4
3. C.
   1
4. D.
   5

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1. A.
   $1012\text{ }kJ{\text{ }mol}^{- 1}$
2. B.
   $1402\text{ }kJ{\text{ }mol}^{- 1}$
3. C.
   $834\text{ }kJ{\text{ }mol}^{- 1}$
4. D.
   $947\text{ }kJ{\text{ }mol}^{- 1}$

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1. A.
2. B.
3. C.
4. D.

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