19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 is/are correct pair(s) regarding diagonally related elements?
Hydrogen carbonate of lithium doesn’t exist in solid state due to
The hydration enthalpies of alkali metal ions …A… with increase in ionic sizes. Here, A refer to
Chemical clinker can be obtained by the reaction of
‘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’?
Which one of the following has magnesium?
What will be the oxidation state of nitrogen and alkali metal when the nitrogen and alkali metal react with each other?
On moving top to bottom among a group the correct trend of hydration enthalpies for alkali metal ions is
Choose the incorrect statement among the following.
Property of the alkaline earth metals that increases with their atomic number
Which one of the following has magnesium?
The most electropositive alkali metal is
The hydration enthalpies of alkali metal ions …A… with increase in ionic sizes. Here, A refer to
Which of the following is/are correct pair(s) regarding diagonally related elements?
What will be the oxidation state of nitrogen and alkali metal when the nitrogen and alkali metal react with each other?
Which of the following has the lowest value of hydration enthalpy?
Which of the following ion(s) is/are responsible for biological functions such as maintenance of ion balance and nerve impulse conduction?
Alkali metals are never found in free state because
On moving top to bottom among a group the correct trend of hydration enthalpies for alkali metal ions is
The most correct reason for colour of alkali metal ions is
The colour of alkali metal ions in any sample can be detected by
Choose the incorrect statement among the following.
Hydrogen carbonate of lithium doesn’t exist in solid state due to
Chemical clinker can be obtained by the reaction of