In graphite and diamond, the percentage of p-characters of the hybrid orbitals in hybridisation are respectively :
33 and 25
33 and 75
50 and 75
67 and 75
Which of the following is a Lewis acid?
In the molecular orbital diagram for the molecular ion, the number of electrons in the molecular orbital is :
As we learned
Molecular Orbital Theory ( M.O.T ) -
Molecular orbital ( M.O ) Theory was developed by F Hund and R.S Mulliken in 1932.
Number of electrons in
For and the correct order of increasing ionic radii is :
An ideal gas undergoes a cyclic process as shown in Figure.
Heat absorbed by the system during process CA is :
Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :
Which of the following statements about colloids is False ?
Freezing point of colloidal solution is lower than true solution at same concentration of a solute.
Colloidal particles can pass through ordinary filter paper.
When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is formed.
When excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated.
For which of the following reactions, is equal to ?
decomposes to and and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mmHg to 87.5 mmHg.
The pressure of the gaseous mixture after 100 minute at constant temperature will be :
When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current assed, inampere , is :
In which of the following reactions, an increase in the volume of the container will favour the formation of products ?
The minimum volume of water required to dissolve 0.1 g lead(II) chloride to get a saturated solution( is :
A sample of is converted by heat to NaCl with a loss of 0.16 g of oxygen. The residue is dissolved in water and precipitated as AgCl. The mass of AgCl (in g) obtained will be : (Given : Molar mass of )
Total number of lone pair of electrons in ion is :
As we learn
Lewis structure -
1. pair of bonded electrons is by means of a dash (-) usually called a bond
2. Lone pairs or non-bonded electrons are represented by dots
3. Electron represent in the last shell of atoms are called valence electrons.
No. of lone pairs =9
Which of the following salts is the most basic in aqueous solution ?
As we learned
Conjugate acid base pair -
The acid base pair that differ only by one proton is called a conjugate acid base pair.
Salt of weak acid and strong base is basic in solution due to hydrolysis
The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make
teeth enamel harder by converting [3Ca3(PO4)2.Ca(OH)2] to :
The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2], and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are :
+3, 0, and +4
+3, +4, and +6
+3, +2, and +4
+3, 0, and +6
An aqueous solution contains 0.10 M H2S and 0.20 M HCl. If the equilibrium constants for the formation of HS− from
H2S is 1.0×10−7 and that of S2− from HS− ions is 1.2×10−13 then the concentration of S2− ions in aqueous solution is :
The compound that does not produce nitrogen gas by the thermal decomposition is :
The major product of the following reaction is :