Question # 1

The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps.it is known as

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Henry's law

Hess's law

joule's law

Law of conservation of energy

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

Enthalpy of a reaction can be measured by

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Glass calorimeter

Barometer

Manometer

Thermometer

The exothermic process is

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Evaporation

Sublimation

Respiration

Boiling

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

How much heat is absorbed by 100 g of water when its temperature decreases from 25°C to 5°C? (heat capacity is 4.2 J/gK)

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84,000J

2000/4.2J

-2000/4.2j

-8400J

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

The enthalpy of formation of a compound is

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Positive

Either positive or negative

Negative

None

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

Which of the following has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

During an exothermic or endothermic reaction which one of the following formula is used to calculate the amount of heat evolved or absorbed

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ΔΗ = ΔΕ+PV

∆E= q+w

Δp =ΔΗ

q = m x s x ∆T

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

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+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

∆H=∆E is true for which of the following reaction

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K+H2O----->KOH+H2

N2+3H2------>2NH3

AlCl3+3NaOH--->Al(OH)3+3 NaCl

4Na + O2----->2Na2O

Whenever a reaction is endothermic, then it means that

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Heat is transferred system to the surrounding

Heat is transferred from surrounding to the system

Heat content of the products is less than that of reactants

Heat content of the reactants is greater than the products

For an endothermic reaction, enthalpy of reactants

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Is smaller than that of the products

Is greater than that of the products

Must be greater or smaller than that of the products

Is equal to that of the products

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