19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The oxidation state of K in KO2 is …A… and the bonding type is …B… Here, A and B refer to
Alkali metals are kept in kerosene oil. Which of the following reason (s) is/are correct regarding this statements?
Which of the following elements(s) form stable superoxide?
Choose the correct statements(s) among the following. I. Alkali metal is highly reactive. II. Alkali metal has lowest ionization enthalpy among their respective period. III. Ionization energy of alkali metals incre…
Which of the following element(s) is used as useful electrode(s) in photoelectric cells?
Alkali metals can be detected by their respective …A… Here, A refer to
Choose the correct option from the codes given below regarding elements and their characteristics colour given in Column I and II of the following table. Column I Column II A. Li 1. Crimson red B. Na 2. Yellow C. K 3.…
The alkali metals and their salts show characteristics colour to
The low melting point of alkali is due to
Along the group in alkali metals the density
Which of the following choice(s) represents(s) physical properties of alkali metals?
Which of the following metal salt is mostly hydrated?
…A… has maximum degree of hydration. Here, A refers to
s-subshell can accommodate maximum number of
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 …
Property of the alkaline earth metals that increases with their atomic number
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.
Which of the following order is correct regarding electropositive character of alkaline earth metals?
Which of the following oxides is not expected to react with sodium hydroxide? (CBSE AIPMT 2009)
The correct reason for smaller size of alkaline earth metal than that of alkali metal is that
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
[X] and [Y] are two nitrates of alkali metals [X] and [Y] on decomposition produces oxides and nitrites respectively. Here, [X] and [Y] refer to
Which of the following metal do not form salt with ethyne?
Why lithium compound are soluble in organic solvent?
On moving top to bottom the negative value of formation …A… for fluoride of alkali metals. Here, A refer to