Home
Class 11
CHEMISTRY
Assertion : Caesium is used in photoelec...

Assertion : Caesium is used in photoelectric cells.
Reason : Caesium is most electropositive element.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
a
Because of the low ionization enthalpy of caesium, when irradiated with light, the light energy absorbed in sufficient to make an atom lose electron. This property makes caesium useful as electrodes in photoelectric cells.
Promotional Banner

Topper's Solved these Questions

  • S BLOCK ELEMENTS ( GROUP 13 - 14)

    A2Z|Exercise AIPMT/ NEET Questions|19 Videos

  • S BLOCK ELEMENTS ( GROUP 13 - 14)

    A2Z|Exercise AIIMS Questions|23 Videos

  • S BLOCK ELEMENTS ( GROUP 13 - 14)

    A2Z|Exercise Compound Of Alkaline Earth Metals|30 Videos

  • REDOX REACTIONS

    A2Z|Exercise Section D - Chapter End Test|29 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

Lithium is used photoelectric cells.

The most electropositive element is

The metal used in photoelectric cell is-

the materical used in photoelectric cells sontains ,

The alkali metal used in photoelectric cell is

A2Z-S BLOCK ELEMENTS ( GROUP 13 - 14)-Section B - Assertion Reasoning
  1. Assertion : All alkali metals do not form superoxides as one of the ma...

    Text Solution

    |

  2. Assertion : Na(2)SO(4) can be used as the starting material for the p...

    Text Solution

    |

  3. Assertion : Potassium carbonate can be prepared by Solvay process like...

    Text Solution

    |

  4. Assertion (A): BaCO(3) is more soluble in HNO(3) than in water. Reas...

    Text Solution

    |

  5. Assertion : The crystalline salts of alkaline earth metals contain mor...

    Text Solution

    |

  6. Assertion : Sodium bicarbonate generally precipitates normal carbonate...

    Text Solution

    |

  7. Assertion : The decahydrated form of sodium carbonate on standing in a...

    Text Solution

    |

  8. Assertion : Solution of sodium hydroxide can be stored in a vessel mad...

    Text Solution

    |

  9. Assertion : White precipitate of BaSO(4) is insoluble in water but rea...

    Text Solution

    |

  10. Assertion : The dissolution of alkali metal hydroxides in water is an ...

    Text Solution

    |

  11. Assertion : Potassium is not obtained by the electrolysis of fused KCl...

    Text Solution

    |

  12. Assertion : Setting of cement is an endothermic process. Reason : Se...

    Text Solution

    |

  13. Assertion : Lithium is the weakest reducing agent among the alkali met...

    Text Solution

    |

  14. Assertion (A): Aqueous solution of Na(2)CO(3) is alkaline in nature. ...

    Text Solution

    |

  15. Assertion : Caesium is used in photoelectric cells. Reason : Caesium...

    Text Solution

    |

  16. Assertion : Berylium does not impart any characteristic colour to the ...

    Text Solution

    |

  17. Assertion : Ionization energy of Be is almost the same as that of Al. ...

    Text Solution

    |

  18. Assertion : BeCl(2) fumes in moist air. Reason : BeCl(2) reacts with...

    Text Solution

    |

  19. Assertion : Be SO(4) and MgSO(4) are soluble in water. Reason : BaSO...

    Text Solution

    |

  20. Assertion : As the very dilute solutions of alkali metals in liquid am...

    Text Solution

    |