19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
For any pure substance at atmospheric pressure, the temperature at which the solid and liquid phases are at equilibrium is called the normal …(X)… or normal …(Y)… of the substance.
Ice and water kept in a perfectly insulated thermos flask (no exchange of heat between its contents and the surroundings) at 273 K and the atmospheric pressure are in equilibrium state and the system shows
Solid Liquid Liquid Gas Solid Gas The above examples are called
Equilibrium involving ions in aqueous solutions is called as
The stage of the system is the dynamic equilibrium in which
Equilibrium can be established for
Purification of camphor involves
H O l H O vap. In this equation, the double half arrows indicate that
Which of the following is correct for equilibrium state?
Equilibria involving O2 molecules and the protein heamoglobin play a crucial role
Chemical equilibria are important in numerous … (X) … and …. (Y) … processes. Here, (X) and (Y) refer to
Shape of XeF4 is
The shape of the molecule depends on the _______
BrF3 molecule, the lone pairs occupy an equatorial position to minimize.
The shape of the noble gas compound XeF4is :
The geometrical arrangement of orbitals and shape of I3– are respectively:
The pair of species with similar shape is :
Correct statement regarding molecules SF4, CF4 and XeF4are:
Which of the molecules has trigonal bipyramidal geometry with bond angles 120o and 90o?
In which of the following structures all the bonds are present at 90o?
Which of the following molecules have same molecule geometry? I. CH4, II BF3 III. NH4+, IV. SF4
For the prediction of geometrical shapes of molecules with the help of VSEPR theory molecules are divided into two categories. These categories are
Why does the repulsion is greater in lp-lp as compared to lp-bp and bp-bp ?
The decreasing order of the repulsive interaction of electron pairs is (Here, lp=lone pair, bp=bond pair).
Consider the following statements, 1. The shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonded) around the central atom. 2. Pairs of electrons in the valence shell repel on…