19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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.
Which of the following ion(s) is/are responsible for biological functions such as maintenance of ion balance and nerve impulse conduction?
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 i…
Alkali metals are never found in free state because
Match List-I with List-II. List-I List-II
Among the following element the non-radioactive elements(s) is/are
The hydration enthalpies of alkali metal ions …A… with increase in ionic sizes. Here, A refer to
The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals (NEET 2020)
Which of the following is an amphoteric hydroxide? (NEET 2019)
HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallise(s)? (NEET 2020)
The structure of beryllium chloride in solid state and vapour phase, are: (NEET 2021)
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is: (NEET 2021)
Which of the following has the lowest value of hydration enthalpy?
Solubility of the alkaline earth metal sulphates in water decreases in the sequence (AIPMT 2015)
In context with beryllium, which one of the following statements is incorrect? (NEET 2016)
For alkali metals, which one of the following trends is incorrect? (KCET 2010)
The suspension of slaked lime in water is (NEET 2016)
Which one of the following is present an an active ingredient in bleaching powder for bleaching action? (AIPMT 2011)
Which of the following will give H2 gas with dilute HNO3? (CPMT 2009)
Among the following, the least thermally stable is (J & K CET 2009)
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts is put under an electric field? (NEET 2017)
Correct order of stability of group IIA metal carbonates is (OJEE 2009)
The solubilities of carbonates decrease down the magnesium group due to a decrease in (RPMT 2008)