Advertisements
Advertisements
All elements of Group 15 show allotropy except ______.
Concept: undefined >> undefined
In the following reaction, identify A and B:
\[\begin{array}{cc}
\ce{C6H12O6 ->[Acetic anhydride] A}\\
\downarrow \text{Conc. nitric acid}\phantom{...}\\
\ce{B}\phantom{.................}\end{array}\]
Concept: undefined >> undefined
Advertisements
The percentage of empty space in a body centred cubic arrangement is ______.
Concept: undefined >> undefined
Match the type of unit cell given in Column I with the features given in Column II.
| Column I | Column II |
| (i) Primitive cubic unit cell | (a) Each of the three perpendicular edges compulsorily have the different edge length i.e; a ≠ b ≠ c. |
| (ii) Body centred cubic unit cell | (b) Number of atoms per unit cell is one. |
| (iii) Face centred cubic unit cell | (c) Each of the three perpendicular edges compulsorily have the same edge length i.e; a = b = c. |
| (iv) End centred orthorhombic cell | (d) In addition to the contribution from unit cell the corner atoms the number of atoms present in a unit cell is one. |
| (e) In addition to the contribution from the corner atoms the number of atoms present in a unit cell is three. |
Concept: undefined >> undefined
KH value for \[\ce{Ar(g)}\], \[\ce{CO2(g)}\], \[\ce{HCHO (g)}\] and \[\ce{CH4(g)}\] are 40.39, 1.67, 1.83 × 10–5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.
Concept: undefined >> undefined
Explain the solubility rule “like dissolves like” in terms of intermolecular forces that exist in solutions.
Concept: undefined >> undefined
What is the significance of Henry’s Law constant KH?
Concept: undefined >> undefined
Explain the following phenomena with the help of Henry’s law.
Painful condition known as bends.
Concept: undefined >> undefined
Match the items given in Column I with the type of solutions given in Column II.
| Column I | Column II |
| (i) Soda water | (a) A solution of gas in solid |
| (ii) Sugar solution | (b) A solution of gas in gas |
| (iii) German silver | (c) A solution of solid in liquid |
| (iv) Air | (d) A solution of solid in solid |
| (v) Hydrogen gas in palladium | (e) A solution of gas in liquid |
| (f) A solution of liquid in solid |
Concept: undefined >> undefined
Can `E_(Cell)^Θ` or `∆_rG^Θ` for cell reaction ever be equal to zero?
Concept: undefined >> undefined
Under what condition is ECell = 0 or ∆rG = 0?
Concept: undefined >> undefined
Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why?
Concept: undefined >> undefined
Write the Nernst equation for the cell reaction in the Daniel cell. How will the ECell be affected when concentration of Zn2+ ions is increased?
Concept: undefined >> undefined
Assertion: Current stops flowing when ECell = 0.
Reason: Equilibrium of the cell reaction is attained.
Concept: undefined >> undefined
Consider figure and answer the question to given below.
- Redraw the diagram to show the direction of electron flow.
- Is silver plate the anode or cathode?
- What will happen if salt bridge is removed?
- When will the cell stop functioning?
- How will concentration of Zn2+ ions and Ag+ ions be affected when the cell functions?
- How will the concentration of Zn2+ ions and Ag+ ions be affected after the cell becomes ‘dead’?
Concept: undefined >> undefined
A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion?
Concept: undefined >> undefined
Which of the following graphs is correct for a first order reaction?
Concept: undefined >> undefined
State a condition under which a bimolecular reaction is kinetically first order reaction.
Concept: undefined >> undefined
With the help of an example explain what is meant by pseudo first order reaction.
Concept: undefined >> undefined
Extent of adsorption of adsorbate from solution phase increases with ______.
Concept: undefined >> undefined
