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Chemistry 1 Marks Question

PART - 1 CH - 5 Thermodynamics · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 15 questions.

Questions

1 Marks Question

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15 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Which will have more entropy : $H _2 O _{())} 300 K$ and $H _2 O _{())} 450 K$ ?
Answer
$H _2 O _{(1)} 450 K$ have more entropy because with increase in temperature discontinuity of molecules increases.
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Question 21 Mark
For any chemical reaction when $\Delta H$ and $\Delta U$ are same?
Answer
In chemical reaction when moles of gaseous products and gaseous reactants are same then $\Delta H$ and $\Delta U$ are similar.
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Question 31 Mark
What is neutralisation energy?
Answer
The heat emitted when salt and water are formed by action of aqueous solution of one gram equivalent acid and one gram equivalent weight is called heat of neutralisation.
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Question 41 Mark
The entropy of $Mg ^{+2}$ ion in aqueous solution will be more before hydration or after hydration.
Answer
In aqueous solution entropy of $Mg ^{+2}$ ion will be more before hydration because due to hydration size of $Mg ^{+2}$ ion increases and entropy decreases.
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Question 51 Mark
Why neutralisation enthalpy of HCl is equal to that of $H _2 SO _4$ ?
Answer
HCl and $H _2 SO _4$ both are strong acids. Hence both gets completely ionised.
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Question 61 Mark
When any intensive property becomes extensive ?
Answer
For unit quantity of substance, intensive property becomes extensive. Example: Density.
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Question 71 Mark
Write the relation between enthalpy change (AH) and change in internal energy (AV)?
Answer
ΔΗ = AU + PΔV
where P Pressure, ΔV = change in volume
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Question 81 Mark
Why the ice cube appeared cool when we touch it?
Answer
The temperature of ice cube is less than that of our body. Hence it absorb energy from our body and it feels cool to our body.
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Question 91 Mark
Define heat capacity.
Answer
The amount of energy required to increase the temperature of an system by 1°C or 1K is known as its heat capacity.
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Question 101 Mark
What do you meant by thermo chemistry?
Answer
The branch of physical chemistry in which we study about the thermal changes in chemical reactions, is known as thermo chemistry.
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Question 111 Mark
The standard heat of formation of diamond is not zero, although it is an element, why?
Answer
In different allotropes of an element, the standard heat of formation its most stable state is zero only. As graphite is more stable than diamond, the standard heat of formation of diamond is not zero.
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Question 151 Mark
Write Zeroth law of thermodynamics.
Answer
If two things A and B are separately in thermal equilibrium with third object C then when A and B comes in contact it will also be in thermal equilibrium.
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