19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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…
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…
Which of the following properties shows a gradual decrease with an increase in atomic number across a period in the periodic table?
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 …
Alkali metals in each period have
Amongst the elements with the following electronic configurations which one of them may have the highest ionization energy?
The lower electron affinity of fluorine than that of chlorine is due to
Second electron affinity
An element with lowest ionization energy in their respective period is
The ionization energy of boron is less than that of beryllium because :
The electronic configurations of the elements X, Y, Z, and J are given below. Which element has the highest metallic character?
From which of the following species it is easiest to remove one electron?
For the second period elements the correct increasing order of first ionization enthalpy is (NEET 2019)
Which of the following oxides is most acidic in nature ? (NEET 2018)
The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? (NEET 2017)
The plot of square root of frequency of X-ray emitted against atomic number led to the suggestion of which law/rule? (MHT CET 2017)
Which of the following pairs contain metalloid elements in the periodic table? (Kerala CEE 2017)
Which of the following is the correct order of stability for the given superoxide’s ? (JIPMER 2017) (a) KO RbO CsO (b) CsO RbO KO (c) RbO CsO KO (d) KO CsO RbO
In which of the following options, the order of arrangements does not agree with the variation of the property indicated against it? (NEET 2016) (a) Al Mg Na F (increasing ionic size)
The species Ar, K and Ca contain the same number of electrons. In which order do their radii increase? (AIPMT 2015) (a) Ca Ar K (b) Ca K Ar (c) K Ar Ca (d) Ar K Ca
The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence (AIPMT 2015)
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 -> …