19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following order is correct for the size of Fe3+, Fe, and Fe2+?
Among 3rd-row elements atomic size is maximum for
Atomic radii of F and Ne, in Å, are given by
Which one of the following ions has the highest value of ionic radius?
Identify the correct order of the size of the following
Which of the following is not a Dobereiner’s triad?
The lUPAC name of an element with atomic number 119 is (NEET 2022)
Identify the incorrect match. (NEET 2020) Name IUPAC Official Name
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 -> …
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 arrangement for the ions in the increasing order of their radius is (KCET 2014) (a) Na ,Cl ,Ca (b) Ca ,K ,S (c) Na ,Al ,Be (d) Cl ,F ,S
Which one of the following is the correct order of the size of the ions? (EAMCET 2014) (a) Na Mg F O (b) O F Na Mg (c) Mg Na F O (d) O F Mg Na
Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O? (NEET 2013)
The electron affinity of Be is similar to (UP CPMT 2013)