19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following explanations justifies not placing hydrogen in either the group of alkali metals or halogens?
Assertion (A): Hydrogen is the first element in the periodic table. Reason (R): It has electronic configuration 1s .
Which of the following statement regarding protium, deuterium and tritium is not correct?
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.
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 …
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
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)
Which of the following statements about hydrogen is incorrect? (NEET 2016)
The moderator used in nuclear reactor is (UP CPMT 2014)
The laboratory method for the preparation of H2O2 is by (UP CPMT 2014)
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 ->
30 volume hydrogen peroxide means (UK PMT 2014)
A commercial sample of H2O2 marked as 100 volume hydrogen peroxide, it means that (Manipal 2014)
The volume of oxygen evolved at STP by decomposition of 0.68 g ‘20 volume’ hydrogen peroxide solution is (MHT CET 2014)
Role of hydrogen peroxide in the below reactions is respectively (CBSE AIPMT 2014) I. H O O H O 2O -> II. H O Ag O 2Ag H O O ->
Which of the following is electron-deficient? (NEET 2013)
The normality of 20 volume hydrogen peroxide solution is (AMU 2012)