19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :
Which of the following statements(s) is/are incorrect regarding the s-block elements? I. Francium is highly radioactive element. II. Oxides and hydroxides of alkali metals and alkaline earth metals are not alkaline in…
Which of the following is/are correct pair(s) regarding diagonally related elements?
Property of the alkaline earth metals that increases with their atomic number
The correct reason for smaller size of alkaline earth metal than that of alkali metal is that
Which of the following order is correct regarding electropositive character of alkaline earth metals?
On moving top to bottom the negative value of formation …A… for fluoride of alkali metals. Here, A refer to
Why lithium compound are soluble in organic solvent?
Which of the following metal do not form salt with ethyne?
Along the group atomic and ionic radii are …X… and along the period atomic and ionic radii are …Y… Here, X and Y refer to
Choose the incorrect statement among the following.
On moving top to bottom among a group the correct trend of hydration enthalpies for alkali metal ions is
Assertion (A): Ba, Ca and Sr produces individual characteristic colour to flame test. Reason (R): this is due to excitation of loosely held electrons from outermost orbit to excited state of orbital.
The colour of alkali metal ions in any sample can be detected by
In concentrated solution, the colour of alkali metals in liquid ammonia is
The most electropositive alkali metal is
Which of the following ion(s) is/are responsible for biological functions such as maintenance of ion balance and nerve impulse conduction?
The most correct reason for colour of alkali metal ions is
Which of the following has the lowest value of hydration enthalpy?
Among the following element the non-radioactive elements(s) is/are
Which of the following statement(s) is/are incorrect regarding property of alkali metals? I. Alkali metal on reaction with water produces a gas as a byproduct which burns with poping sound. II. Alkali metals dissolve …
Alkali metals are never found in free state because
The hydration enthalpies of alkali metal ions …A… with increase in ionic sizes. Here, A refer to
A chemical (A) is used for the preparation of washing soda to recover ammonia. When CO₂ is bubbled through an aqueous solution of A, the solution turns milky. It is used white washing due to disinfectant nature. What …
Chemical clinker can be obtained by the reaction of