Theromodynamics and Thermochemistry Test

Result

Theromodynamics and Thermochemistry Test - 4

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is correct about heat of combustion–

A
It may be exothermic in some cases and endothermic in other cases

B
It is applicable to gaseous substances only

C
It is always an exothermic reaction

D
Its value does not change with temperature

Solution

Combustion reactions are always accompanied by the release of heat.
Question 2
1 / -0

Values of heats of formation for SiO₂ and MgO are – 48.4 and – 34.7 kJ respectively. The heat of the reaction
2Mg + SiO₂→ 2MgO + Si is -

A
62.10 kJ

B
– 62.10 kJ

C
– 13.7 kJ

D
13.7 kJ

Solution

2Mg + O₂→ 2MgO ΔH = –34.7 kJ----------(1)
Si + O₂→ SiO₂ ΔH = –48.4 kJ ----------(2)

Subtract (2) from (1)

2Mg + SiO₂→ 2MgO + Si ΔH= –34.7 + 48.4
= +13.7 kJ
Question 3
1 / -0

When heat is supplied to an ideal gas in an isothermal process, the -

A
Gas will do positive work

B
Gas will do negative work

C
Kinetic energy of gas will increase

D
Gas will not obey the law of conservation of energy

Solution

In isothermal process
q = –w
∵ q is +ve
so, gas will do negative work.
Question 4
1 / -0

Which is the intensive property -

A
Temperature

B
Viscosity

C
Density

D
All

Solution

Those properties which depend only upon the nature of the substance and are independent of the amount of the substance present in the system. eq. T,P, density viscosity etc.