19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 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)
The correct order of decreasing first ionisation potential is (UP CPMT 2013)
The elements ‘X’, ‘Y’, and ‘Z’ form oxides which are acidic, basic, and amphoteric respectively. The correct order of their electronegativity is
Ease of formation of the cation is favoured by (RPMT 2010)
Which one of the following is correct order of the size? (Haryana PMT 2010)
The element with atomic number 117 has not been discovered yet. In which family would you place this element if discovered? [Kerala CEE 2009]
Which represents the correct order of the first ionization potential of third-period elements? (AFMC 2009)
Increasing order of ionic size for the ions, F–, O2–, Na+, Al3+ is (AMU 2009)
In which of the following arrangements, the order is not according to the property indicated after it in the bracket? (Manipal 2009)
The oxide of an element whose electronic configuration is 1s2, 2s2 2p6, 3s1 is (KCET 2009)
It is believed that atoms combine with each other such that the outermost shell acquires a stable configuration of 8 electrons. If stability were attained with 6 electrons rather than 8; what would be the formula of t…
The outermost electronic configuration of the most electronegative element is
Which of the following isoelectronic ions has the lowest ionization energy?
The correct order of second ionization potential of C, N, O and F is
The ionization energy will be maximum for
A neutral atom will have the lowest ionization potential when electronic configuration is
The highest first ionization potential is of