19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Elements whose outer electronic configuration vary from ns2np1 to ns2np6 constitute
The element which has highest first ionization energy in the periodic table is
Molybdenum metal is related to which block?
The bond enthalpy is the highest for
Which of the following is not a Dobereiner’s triad?
An element will have lowest ionisation potential when its electronic configuration is
Which one of the following pair of elements has similar properties?
Which one of the following ions has the highest value of ionic radius? (DUMET 2008) (a) O (b) B
ns and ns outermost electronic configuration belongs to the
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)
Which of the following is not a use of graphite ?
Match the column I with column II and mark the appropriate choice. Column I Column II
Which of the following is not true about structure of diamond and graphite ?
Silicon is an important constituent of
What is the number of free electrons present on each carbon atom in graphite ?
The purest form of coal is
Identify the incorrect statement.
Glass and cement are two important examples of
Identify the wrong example from the following for the group 14 elements.
The hardest substance is
Which of the following is not from 14 th group
Buckminsterfullerence is
When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +
In graphite, the layers of carbon atoms are held by