19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The electronic configurations of the elements X, Y, Z, and J are given below. Which element has the highest metallic character?
The ionization energy of boron is less than that of beryllium because :
An element with lowest ionization energy in their respective period is
Second electron affinity
The lower electron affinity of fluorine than that of chlorine is due to
A, B, and C are hydroxy-compounds of the elements X, Y, and Z respectively. X, Y, and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids …
Consider the following statements: (I) The radius of an anion is larger than that of the parent atom. (II) The ionization energy generally increases with the increasing atomic number in a period. (III) The electronega…
Which of the following properties shows a gradual decrease with an increase in atomic number across a period in the periodic table?
Assertion: Third ionization energy of sulphur is larger than phosphorous. Reason: There is a larger amount of stability associated with filled s- and p- sub-shells (a noble gas electron configuration) which correspond…
Assertion: Generally, ionization enthalpy increases from left to right in a period. Reason: When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of the inner co…
Assertion: Boron has a smaller first ionization enthalpy than beryllium. Reason: The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of ele…
Assertion: Manganese (atomic number 25) has a less favorable electron affinity than its neighbors on either side. Reason: The magnitude of an element’s electron affinity depends on the element’s valence shell electron…
Assertion: Electron gain enthalpy becomes less negative as we go down a group. Reason: The size of the atom increases on going down the group and the added electron would be farther from the nucleus.
The element with highest I.E. is:
The element with lowest electron gain enthalpy is:
The most ionic compound will be formed between:
Which one of the following ions has the highest value of ionic radius? (DUMET 2008) (a) O (b) B
Which of the following is not a Dobereiner’s triad?
John Alexander Newlands relationship referred to as the …….A…… Here, A refers to
According to Alexander Newlands, elements are arranged in…..A….order of their atomic weights. Here A refers to
Lothar Meyer plotted the physical properties such as atomic volume, melting point and ….A…..against atomic weight. Here, A refers to
Lothar Meyer drew a graph showing the relation between
According to Mendeleev, elements are arranged in order of their increasing ……A….Here, A refers to
Mendeleev left the gap under aluminum and a gap under silicon and called these elements Eka-Aluminium and……A……Here, A refers to
Which of the following is incorrect explanation about Mendeleev’s periodic law ?