19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The increasing order of the density of alkali metal is (Kerala CEE 2011)
The electronegativity of the following elements increases in the order [AFMC 2011]
Which of the following has the highest electron affinity? (AFMC 2011)
The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium, is (Kerala CEE 2011)
The electronic configuration of an element is 1s ,2s 2p ,3s 3p 3d ,4s 4p 4d ,5s 5p . From which group of the period table, it belongs ? (KCET 2012)
Identify the wrong statement in the following (AIPMT 2012)
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 -> …
The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence (AIPMT 2015)
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 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…
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?
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 …
Which of the following isoelectronic ions has the lowest ionization energy?
The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is:-