19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Consider the following statements: 1. Atomic hydrogen is obtained by passing hydrogen through an electric arc. 2. Hydrogen gas will not reduce heated aluminium oxide. 3. Finely divided palladium absorbs large volume o…
Which of the following is an atom of tritium? (a) (b) (c) (d)
Hydrogen can be prepared by the action of dil. H2SO4 on
Tritium, a radioactive isotope of hydrogen, emits which of the following particles? (NEET 2021)
Match the following and identify the correct option. (NEET 2020) Column I Column II
In which of the following properties hydrogen does not show similarity with alkali metals?
The number of hydrogen bonded water molecule(s) associated with CuSO4.5H2O is (Odisha NEET 2019)
The method used to remove temporary hardness of water is (NEET 2019)
In what respect electronic configuration of hydrogen and halogens are similar?
Assertion: In alkaline medium, H2O2 reacts with potassium ferricyanide. Reason : H2O2 is a strong reducing agent.
Assertion: Anhydrous BaO2 (barium peroxide) is used for preparing H2O2. Reason: Hydrated BaO2 is not available.
Assertion: Permanent hardness of water can be removed by using washing soda. Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.
Assertion: Among the two OH bonds in H2O molecule, the energy required to break the first OH bond and the other OH bond is same. Reason: This is because the electronic environment around oxygen is the same even after …
Assertion: Increasing pressure on pure water decreases its freezing point. Reason: Density of water is maximum at 4° C.
Which of the following is not correct regarding the electrolytic preparation of H2O2?
Very pure hydrogen (99.9%) can be made by which of the following processes?
Pure nascent hydrogen is best obtained by
Which of the following metals does not liberate hydrogen from acids?
Which of the following metals will react with NaOH and KOH to liberate hydrogen gas?
The process of production of syngas coal is quite common these days. The production of syngas from coal is called
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…
In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?
Which of the following statement is correct regarding properties of hydrogen?
Hydrogen does not possess the metallic characteristics under normal conditions because
Why does H+ ion always get associated with other atoms or molecules?