19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following equation depicts reducing nature of H2O2?
What will be the mass of oxygen liberated by decomposition of 200 mL hydrogen peroxide solution with a strength of 34 g per litre ?
What is the volume of “20 volume H2O2” required to get 5000 cm3 of oxygen at STP ?
The volume of oxygen liberated from 15 mL of 20 volume H2O2 is
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly
Assertion: Increasing pressure on pure water decreases its freezing point. Reason: Density of water is maximum at 4° C.
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 …
Point out the element which has simplest atomic structure among all the elements around us in nature.
In atomic form, hydrogen consists of…….X…… proton and ……..Y…… electron. X and Y are
In elemental form, hydrogen exists as
Hydrogen has resemblance to alkali metals as well as with halogens. The reason is that
Like alkali metals, hydrogen forms I. Oxides and oxyacids. II. Halides and interhalides. III. Oxides, halides and sulphide.
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?
Which of the following statement regarding protium, deuterium and tritium is not correct?
Assertion (A): Hydrogen is the first element in the periodic table. Reason (R): It has electronic configuration 1s .
Which of the following is/are true statement(s) regarding characteristic of hydrogen? I. Hydrogen resembles alkali metals due to the similar outer electronic configuration ns . II. Hydrogen resembles halogens due to …
Which of the following explanations justifies not placing hydrogen in either the group of alkali metals or halogens?
Which of the elements is present in plant, animal tissues, carbohydrates, proteins, hydrides including hydrocarbons and many other compounds?
Which of the following is not an isotope of hydrogen?
Deuterium is
The isotopes of hydrogen have different physical properties due to difference in mass. They have almost same chemical properties with a difference in their rates of reactions which is mainly due to
Which of the following is an atom of tritium? (a) (b) (c) (d)
In which of the following properties hydrogen does not show similarity with alkali metals?
In what respect electronic configuration of hydrogen and halogens are similar?
Hydrogen is prepared by the reaction of