19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Hydrogenation of vegetable oils using nickel as a catalyst gives edible fats which is/are known as
The chemical reactions of dihydrogen are accomplished by
Name the gas, which is colourless, odourless, tasteless, combustible, lighter than air and insoluble in water.
Why does H+ ion always get associated with other atoms or molecules?
From group 6 only one metal forms hydride. This metal is
Hydrogen does not possess the metallic characteristics under normal conditions because
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?
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
Point out the element which has simplest atomic structure among all the elements around us in nature.
In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?
Water gas is mixed with steam and the mixture is passed over heated Fe2O3 in presence of Cr2O3. The mixture when passed in water dissolves CO2 and dihydrogen left undissolved is collected. This method of preparation o…
The process of production of syngas coal is quite common these days. The production of syngas from coal is called
Which of the following metals will react with NaOH and KOH to liberate hydrogen gas?
Which of the following metals does not liberate hydrogen from acids?
Pure nascent hydrogen is best obtained by
Very pure hydrogen (99.9%) can be made by which of the following processes?
Syngas is a mixture of