Heat Capacity
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[Use atomic masses (in g mol–1): N = 14, Ar = 40]
- 15 bar
- 18 bar
- 9 bar
- 12 bar
Why are the lanthanides and the actinides given a separate position in the modern periodic table?
Lanthanides and actinides are placed in separate rows at the bottom of the periodic table. Give the reason for this arrangement.
Which is the lightest gas?
The number of elements in the 4th period of periodic table are -
8
18
10
32
(i) at constant volume and
(ii) at constant pressure.
The change in internal energy of the gas is :
- More for (ii)
- Same in both cases
- More for (i)
- Independent of number of moles
Give reasons why “Atomic size decreases across a Period but increases down a group of the periodic table”.
Which of the following properties are suitable for a cooking utensil?
High specific heat and high conductivity.
Low specific heat and low conductivity.
High specific heat and low conductivity.
Low specific heat and high conductivity.
A soluble solid in solution has the effect of raising its boiling point and depressing its freezing point. The addition of non-volatile substances to a solvent decreases the vapor pressure and the added solute particles affects the formation of pure solvent crystals. According to many researches the decrease in freezing point directly correlated to the concentration of solutes dissolved in the solvent. This phenomenon is expressed as freezing point depression and it is useful for several applications such as freeze concentration of liquid food and to find the molar mass of an unknown solute in the solution. Freeze concentration is a high quality liquid food concentration method where water is removed by forming ice crystals. This is done by cooling the liquid food below the freezing point of the solution.
When a non-volatile solid is added to pure water it will
- Boils above 100oC and freezes above 0oC
- Boils above 100oC and freezes below 0oC
- Boils below 100oC and freezes above 0oC
- Boils below 100oC and freezes below 0oC
- 6.56 joules
- 8.32×102 joules
- 12.48×102joules
- 20.80 joules
C6H6(l)+152O2(g)→6CO2(g)+3H2O(l)
Proceeds spontaneously because the magnitude of-
- ΔH>0, TΔS<0
- ΔH=TΔS
- ΔH>TΔS
- ΔH<TΔS
- magnetic quantum number of any element of the period.
- maximum Principal quantum number of any element of the period.
- maximum Azimuthal quantum number of any element of the period.
- atomic number of any element of the period.
If heat of atomisation of is then the bond energy of bond (in ) will be
Why are the 18th group elements called inert gases?
Noble gases have very low boiling points. Why?
If 900J/g of heat is exchanged at boiling point of water then what is increase in entropy?
- Lattice point
- Crystal lattice
- Unit cell
- Isomorphism
The least reactive element in group 1-A is .
- 569 mL
- 365 mL
- 265 mL
- 621 mL
- 0.42 J/Kmol
- 4.2 J/Kmol
- 0.14 J/Kmol
- zero
- 97.3 oC
- 33.4 oC
- 80.1 oC
- 60.0 oC
.
.
When water solidifies to ice then heat is
Liberated
Absorbed
No change
Depending on the condition heat may be absorbed or liberated.
Name the following:
The smallest element in period 3.
Where are the metals located in the periodic table?
A good conductor of heat will have specific heat capacity.