19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In concentrated solution, the colour of alkali metals in liquid ammonia is
Which of the following metal do not form salt with ethyne?
The correct reason for smaller size of alkaline earth metal than that of alkali metal is that
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.
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
Which of the following order is correct regarding electropositive character of alkaline earth metals?
Which of the following has the lowest value of hydration enthalpy?
The most correct reason for colour of alkali metal ions is
The hydration enthalpies of alkali metal ions …A… with increase in ionic sizes. Here, A refer to
The colour of alkali metal ions in any sample can be detected by
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 most electropositive alkali metal is
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 he following is/are less soluble in water? LiF, CsI, NaCl, KCl
Among the following element the non-radioactive elements(s) is/are
Which of the following ion(s) is/are responsible for biological functions such as maintenance of ion balance and nerve impulse conduction?
Which one of the following has magnesium?
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 …
‘A’ is an important constituent of cement which is responsible for setting of cement. What is the number of water of crystallization present in ‘A’?
n-factor of Ba(MnO₄)₂ in acidic medium is
For the reaction, H PO NaOH NaH PO H O → What is the equivalent weight of H₃PO₂? (mol. wt. is M)
aK Cr O bKCl cH SO → xCrO Cl yKHSO zH O The above equation balances when
aK Cr O bKCl cH SO → xCrO Cl yKHSO zH O The above equation balances when