19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Temporary hardness of water is due to the presence of
Which of the following reactions shows reduction of water ?
Presence of water can be detected by
Given below are two reactions of water with sodium and carbon dioxide. What is the nature of water in these reactions? (i) 2Na + 2H2O -> 2NaOH + H2 (ii) 6CO2 + 12H2O -> C6H12O6 + 6H2O + 6O2
Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?
Liquid water is denser than ice due to
The density of water is less in its solid state because
Which is not a property of water ?
Water plays a key role in the biosphere. It is due to certain properties of H2O as compared to other liquids. Which of these is not a correct property of water?
In which of the following reactions H2O acts as a bronsted acid? (a) 3 aq aq 4 aq H O NH OH NH l (b) aq aq aq H O H S H O HS l (c) aq aq H O H O H O OH l l (d) aq aq H OH H O ( ) ( ) l
How many hydrogen bonded water molecules are associated with CuSO4.5H2O?
The maximum number of hydrogen bonds formed by a water molecule in ice is
Hydrolysis of SiCl4 gives
What is the reaction given below called? aq aq H O H O H O OH l l
Which one of the following statements about water is FALSE?
What is meant by demineralized water ?
The HOH angle in water molecule is about
Assertion (A): The crystalline form of water is ice. Reason (R): At atmospheric pressure ice crystallizes in the hexagonal form but at very low temperature it condenses to the cubic form.
In complex hydrides, hydride ions act as ligand and are coordinated to metal ions. These hydrides are good reducing agents. Which of the following hydrides is not complex hydride ?
From group 6 only one metal forms hydride. This metal is
What is the trend of boiling points of hydrides of N, O and F?
Dihydrogen forms three types of hydrides. (i) hydrides are formed by alkali metals and alkaline earth metals. (ii) hydrides are formed by non-metals and (iii) hydrides are formed by d and f-block elements at elevated …
On moving from left to right in a period what is the order of acidic character of hydrides?
Non-stoichiometric hydrides are produced by
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match.