Assertion : Potassium and caesium are used in photoelectric cells.
Reason : Potassium and caesium emit electrons on exposure to light.
Reason : Potassium and caesium emit electrons on exposure to light.
- AIf both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
- BIf both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
- CIf the Assertion is correct but Reason is incorrect.
- DIf both the Assertion and Reason are incorrect.
Explore More
Similar Questions
Which of the following elements release $H_2$ gas on reaction with $NaOH$?
Medium
View SolutionThe metal which does not form ammonium nitrate by reaction with dilute nitric acid is
Easy
View SolutionAlkali metals dissolve in liquid ammonia to give a deep blue solution. This blue color is due to which of the following?
Medium
View SolutionWhich of the following does not liberate a brown gas?
Difficult
View SolutionArrange the following compounds in the increasing order of their thermal stability. Identify the correct sequence.
$I - K_2CO_3, II - MgCO_3, III - CaCO_3, IV - BeCO_3$
$I - K_2CO_3, II - MgCO_3, III - CaCO_3, IV - BeCO_3$
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo