19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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]
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…
Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ? (AIPMT 2009) (a) Ne 3s 3p (b) Ar 3d 4s 4p (c) Ne 3s 3p (d) Ne 3s 3p
The discovery of which of the following group of elements gave a death blow to Newland’s law of octaves? (Manipal 2008)
An element with atomic number 112 has been made recently. It should be (Haryana PMT 2008)
Element with atomic number 38, belongs to (MP PMT 2008)
Which two elements in the Periodic Table would you expect to combine in the most violent fashion? (Kerala CEE 2008)
A neutral atom will have the lowest ionization potential when electronic configuration is
The highest first ionization potential is of
Ionization potential for a noble gas is
Ionisation energy decreases down the group due to
Which of the following has the lowest ionization energy?
The element with the lowest ionization potential is