18 JEE Main 2021 Classification of Elements and Periodicity in Properties previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 previous-year questions from the Classification of Elements and Periodicity in Properties chapter of Chemistry. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Classification of Elements and Periodicity in Properties chapter hub.
The CORRECT order of first ionisation enthalpy is:
Consider the elements Mg , Al , S , P and Si , the correct increasing order of their first ionisation enthalpy is:
The ionic radii of K + , Na + , Al 3 + and Mg 2 + are in the order :
The first ionization energy of magnesium is smaller, as compared to that of elements X and Y , but higher than that of…
The ionic radius of Na + ions is 1 . 02 A ° . The ionic radii (in A ° ) of Mg 2 + and Al 3 + , respectively,…
Match List- I with List- II . List- I Electronic configuration of elements List- II Δ i H in kJ   mol - 1 a 1…
The class of drug to which chlordiazepoxide with above structure belongs is :
The ionic radii of F - and O 2 - respectively are 1 . 33 A and 1 . 4 A , while the covalent radius of N is 0 . 74 A The…
The absolute value of the electron gain enthalpy of halogens satisfies:
Match List   -   I with List -   II : List - I List - II a NaOH i Acidic b Be ( OH ) 2 ii Basic c Ca ( O…
Log in to unlock the full list, track what you've solved, and practice on the TCS iON-style CBT player. It's free.