19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
…….X….. are crystalline, non-volatile and non- conducting in solid state. (X) Melts conduct electricity and on electrolysis liberate dihydrogen gas at anode. Here, X refers to
Which of the following reactions of hydrogen with non- metals represents Haber‟s process ? (a) heat 2H O 2H O; H 285.9kJmol -> (b) 673K,Fe 200atm 3H N 2NH ; H 92.6kJmol -> (c) hv H Cl 2HCl -> (d) 1100 C 2H C C…
The order of reactivity of halogens towards hydrogen is
NaH s H O NaOH aq H g -> and 8LiH Al Cl 2LiAlH 6LiCl -> In the above reaction, NaH and LiH are the examples of
If a mole of hydrogen molecule is heated to a high temperature, then which of the following reaction take place ? (a) 2 g g g H 436kJmol H H -> (b) 2 g 2 g 2H 820kJmol 2H -> (c) 2 g 2 g g g H H 436kJmol …
Which of the following properties of hydrogen is incorrect?
Which of the following is not a property of hydrogen?
ZnO Cu CO H ->product. Identify the product formed in the given reaction. (a) CH COOH (b) CO (c) C O (d) CH OH
On burning hydrogen in air, the colour of flame is
Which of the following statements is correct regarding hydrogen?
CH ,NH ,H O and HF are the example of
Which of the following gas in insoluble in water?
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.
Which of the following statement is correct regarding properties of hydrogen?
Hydrogen does not possess the metallic characteristics under normal conditions because
In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement?
Why does H+ ion always get associated with other atoms or molecules?
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
Name the gas, which is colourless, odourless, tasteless, combustible, lighter than air and insoluble in water.
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…
Syngas is a mixture of
Very pure hydrogen (99.9%) can be made by which of the following processes?
The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron chromate. What is this process called?
Pure nascent hydrogen is best obtained by