List of top Chemistry Questions on Periodic Trends In Properties Of Elements

Which transition element of the 3d series does not show variable oxidation state?
An unknown element 'E' forms two compounds: \(EO_{2}\) and \(EX_{4}\). To which group does element 'E' belong?
Assertion (A): The first ionization enthalpy of nitrogen is higher than that of oxygen.
Reason (R): Nitrogen has a half-filled \(2p\) orbital, which is extra stable.
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
Match the following \[ \begin{array}{|c|c|} \hline \text{List-I} & \text{List-II} \\ \hline \text{A. Co, Ni} & \text{I. Electronegativity} \\ \text{B. K, Ba} & \text{II. Electron gain enthalpy} \\ \text{C. N, Cl} & \text{III. Metallic radius} \\ \text{D. Ar, Kr} & \text{IV. Standard reduction potential (-ve)} \\ \hline \end{array} \] The correct answer is
Which of the following elements has the highest first ionization enthalpy?
Correct increasing order of first ionization enthalpy is: C, O, N, F
Which of the following is not the correct order of atomic radius of the elements given?
In which of the following, elements are not in correct order with respect to the property mentioned in brackets?
Which of the following is the correct increasing order of atomic number of elements A, B and C of third period, if their oxides are amphoteric, basic and acidic in nature respectively?
Which of the following orders is not correct for the property mentioned against them?
Identify the correct pair of species having same number of valency electrons
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?
Given below are two statements:
Statement I: \( \mathrm{C<O<N<F} \) is the correct order in terms of first ionization enthalpy values.
Statement II: \( \mathrm{S>Se>Te>Po>O} \) is the correct order in terms of the magnitude of electron gain enthalpy values.
In the light of the above statements, choose the correct answer from the options given below:
Zirconium is a transition element, but Zinc is not. Why?
Write the highest oxidation state of Cr and Mn.
Which of the following statements is/are correct?
I. Atomic radius increases as we go from left to right in a period
II. Atomic size increases as we go down a group.
Atomic radii and ionic radius of lanthanoid series increases from La to Lu due to?
What is the electronic configuration of palladium?

Given below are two statements: 
Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. 
Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers. 
In the light of the above statements, Choose the correct answer from the options given below:

The correct orders among the following are:  
[A.] Atomic radius : \(B<Al<Ga<In<Tl\) 
[B.] Electronegativity : \(Al<Ga<In<Tl<B\) 
[C.] Density : \(Tl<In<Ga<Al<B\) 
[D.] 1st Ionisation Energy : 
In\(<Al<Ga<Tl<B\) 
Choose the correct answer from the options given below :