19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 …
What is the trend of boiling points of hydrides of N, O and F?
From group 6 only one metal forms hydride. This metal is
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 ?
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.
The HOH angle in water molecule is about
What is meant by demineralized water ?
Which one of the following statements about water is FALSE?
What is the reaction given below called? aq aq H O H O H O OH l l
Hydrolysis of SiCl4 gives
The maximum number of hydrogen bonds formed by a water molecule in ice is
How many hydrogen bonded water molecules are associated with CuSO4.5H2O?
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
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?
Which is not a property of water ?
The density of water is less in its solid state because
Liquid water is denser than ice due to
Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?
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
Presence of water can be detected by
Which of the following reactions shows reduction of water ?
Temporary hardness of water is due to the presence of
The exhausted cation and anion exchange resin beds are regenerated by treatment with
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
Number of parts by weight of calcium carbonate present in …….defined as the degree of hardness of water. Fill the blank with an appropriate statement.