19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The most ionic compound will be formed between:
The element with lowest electron gain enthalpy is:
The element with highest I.E. is:
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.
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: 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: 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…
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…
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 …
The lower electron affinity of fluorine than that of chlorine is due to
Consider the isoelectronic species, Na+, Mg2+,F –and O2–. The correct order of increasing length of their radii is ...........
Of the following orders of relative sizes, choose the incorrect order
In which of the following sets of elements, they have nearly the same atomic size
Of the following which will have the minimum atomic radius?
Which of the following represents an excited state of an atom?
If the Aufbau principle had not been followed, Ca (Z = 20) would have been placed in the:
La (Lanthanum) having atomic number 57 is a member of:
The statement that is not correct for periodic classification of elements is:
The period number in the long form of the periodic table is equal to
The formation of the oxide ion, g O from oxygen atom requires first an exothermic and then an endothermic step as shown below: (NEET 2015) o f g g O e O ; H 141kJmol -> o f g g O e O ; H 780kJmol -> …
Which of the following orders of ionic radii is correctly represented? [AIPMT 2014]
Amongst the following, select the element having highest ionisation enthalpy. (MHT CET 2014)
The compound not acting as a reducing agent is (Manipal 2014)
The correct order of the decreasing ionic radii among the following isoelectronic species is (CBSE AIPMT 2010)
The element with the electronic configuration as [Ar]3d10 4s2 4p3 represents a (JCECE 2010)