19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Review the equilibrium and choose the correct statement HClO4 + H2O H3O + + ClO4 –
The conjugate acid of HPO4 2– is
Conjugate base of NH3 is (a) NH (b) NH (c) NH
The correct order of acid strength is
Cl – is the conjugate base of
The conjugate base of NH2 – is
A weak acid, HA has a Ka of 1.00 10 x . If 0.100 mole of this acid is dissolved in 1 L of water, the percentage of acid dissociated at equilibrium is closest to
Which of the following is incorrect? (BHU 2008)
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?