List of top Chemistry Questions on Periodic Trends In Properties Of Elements asked in NEET (UG)

અભિકલ્પન A: O ની પ્રથમ આયનીકરણ એન્થાલ્પી N અને F કરતાં ઓછી છે.
કારણ R: O માંથી એક ઇલેક્ટ્રોનનું નુકસાન સ્થિર અર્ધ-ભરેલા p ઓર્બિટલ તરફ દોરી જાય છે.

नीचे दो कथन दिए गए हैं : एक को अभिकथन A और दूसरे को कारण R निरूपित किया गया है।
अभिकथन A : O की प्रथम आयनन ऊर्जा (जूल/मोल), N और F की तुलना में कम होती है।
कारण R : O से एक इलेक्ट्रॉन निकालने से इसका स्थायी अर्ध-पूर्ण \(p\)-कक्षक विन्यास प्राप्त होता है।
उपयुक्त विकल्प चुनिए :

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:

The correct statement is

Among the following options, the correct trend in the electron gain enthalpy is

A bulb is rated at \(150\ watt\), converting \(8%\) energy into light. If energy of one photon is \(4.42\times10^{-19}J\), how many photons are emitted by the bulb per second?

Match List-I with List-II :

List - I(Atom/Molecule)	List - II(Property)
(A) Nitrogen atom	(I) Paramagnetic
(B) Fluorine molecule	(II) Most reactive element in group 18
(C) Oxygen molecule	(III) Element with highest ionisation enthalpy in group 15
(D) Xenon atom	(IV) Strongest oxidising agent

Identify the correct answer from the options given below :