19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors, which one is the most important in this respect?
Like alkali metals, hydrogen forms I. Oxides and oxyacids. II. Halides and interhalides. III. Oxides, halides and sulphide.
Hydrogen has resemblance to alkali metals as well as with halogens. The reason is that
In elemental form, hydrogen exists as
In atomic form, hydrogen consists of…….X…… proton and ……..Y…… electron. X and Y are
Which of the following statements about hydrogen is incorrect? (NEET 2016)
Point out the element which has simplest atomic structure among all the elements around us in nature.
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
Strength of H2O2 is 15.18 gL–1, then it is equal to (KCET 2014)
In which of the following reactions, H2O2 acts as a reducing agent? (EAMCET 2014) (a) H HOCl H O H O Cl O -> (b) OH Mn H O Mn 2OH -> (c) OH 2Fe H O 2Fe 2OH -> (d) H PbS s 4H O aq PbSO s 4H O l ->
Presence of water can be detected by
30 volume hydrogen peroxide means (UK PMT 2014)
A commercial sample of H2O2 marked as 100 volume hydrogen peroxide, it means that (Manipal 2014)