| 1 |
In a chemical change, the energy in the from of heat will either be evolved or absorbed and this is called: |
Endothermic.
Heat of products.
Exothermic reaction.
Heat of reaction.
|
| 2 |
It is noticed that energy in the from of heat is either evolved or absorbed as a result of a: |
Physical change.
Chemical change.
Biological change.
All of above.
|
| 3 |
The majority of reactions which give stable products are: |
Exothermic.
Isothermal.
Endothermic.
Both (b) and (c).
|
| 4 |
In endothermic reactions, the heat contents of the: |
Products equal to the reactants.
Reactants more than that of products.
Products more than that of reactants
Both (b) and (c)
|
| 5 |
If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air : |
Remains constant.
Decreases.
Increases.
Fluctuates rapidly.
|
| 6 |
The study of heat changes accompanying a chemical reaction is known as : |
Thermochemistry.
Biochemistry.
Physical chemistry.
Analytical chemistry.
|
| 7 |
Enthalpy of neutralization of all the strong acids and strong bases has the same value because: |
Neutralization leads to the formation of salt and water.
Strong acids and bases are ionic substances.
Acids always give rise to H<sup>+</sup>ions and bases always furnish OH<sup>-</sup>ions.
The net chemical change involve the combination of H<sup>+</sup> and OH<sup>-</sup>ions to form water.
|
| 8 |
The net heat change in a chemical reaction is same, whether it is brought about in two or more different ways in one or several steps. It is known as: |
Henry's law.
Joule's principle.
Hess's law.
Law of conservation of energy.
|
| 9 |
For the reaction : NaOH + HCl---------------> NaCl + H2O the change in enthalpy is called: |
Heat of reaction.
Heat of formation.
Heat of neutralization.
Heat of combustion.
|
| 10 |
For a given process, the heat changes at constant volume ( qv)are related to other as: |
<p class="MsoNormal">q<sub>p</sub>= q<sub>v</sub><o:p></o:p></p>
<p class="MsoNormal">q<sub>p</sub><q<sub>v</sub><o:p></o:p></p>
<p class="MsoNormal">q<sub>p</sub>>q<sub>v</sub><o:p></o:p></p>
<p class="MsoNormal">q<sub>p</sub>=q<sub>v/2</sub><o:p></o:p></p>
|
| 11 |
Which of the following statements is contrary to the first law of thermodynamics? |
Energy can neither be created no destroyed.
One form of energy can be transferred into an equivalent amount of the kinds of energy.
In a adiabatic process, the work done is independent of its path.
Continuous production of mechanical work without supplying an equivalent amount of heat is possible.
|
| 12 |
The change in heat energy of a chemical reaction at constant temperature and pressure is called : |
Enthalpy change.
Seat of sublimation.
Bind energy.
Internal energy change.
|
| 13 |
Calorie is equivalent to : |
0.4184 J
4184 J
4.184 J
418.4 J
|
| 14 |
In endothermic reactions, the heat content of the: |
Products is more than that of reactants.
Reactants is more than than to products.
Both (a) and (b).
Reactants and products are equal.
|
| 15 |
If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air: |
Remains constant.
Increase.
Decreases.
Remain unchanged.
|
| 16 |
Molecular orbitals are filled with the available electrons according to: |
Hund's of rule.
Pauli's exclusion principle.
Aufbau principle.
All of above.
|
| 17 |
Molecular orbitals are filled with the available: |
Hund's of rule.
Pauli's exclusion principle.
Aufbau principle.
All of above.
|
| 18 |
CsF is an ionic compound because: |
High I.P of Cs and high E.A of F.
High I.P of Cs and low E.A of F.
Low I.P of Cs and high E.A of F.
Low I.P of Cs and low E.A of F.
|
| 19 |
The covalent radius of Cl atom is: |
99.4 pm.
176.7 pm
38 pm
76 pm.
|
| 20 |
The increase in size of the anion is due to: |
Increase in electron-electron repulsion
Increase in valence shell electrons.
Decrease in valence shell electrons.
Both (a) and (b).
|
| 21 |
The decrease in radius in large for: |
Monovalent ions.
Trivalent ions.
Divalent ions.
Atoms.
|
| 22 |
The radius of ion while considering it to be spherical in shape is called: |
Covalent radii.
Atomic radii.
Ionic radii.
Both (a) and (C).
|
| 23 |
As the nuclear charge increases, the pull on the electrons is increased and size of an atom: |
Decreases.
Remain same.
Increases.
Is negligible.
|
| 24 |
Which statement is true for Na and Na+ |
Both have equal sizes.
Both have same properties.
Size of Na is smaller than Na<sup>+</sup>
Size of Na is greater than Na<sup>+</sup>
|
| 25 |
In a group of periodic table, atomic radii is: |
Remains some.
Increases.
First decreases then increases.
Decreases.
|
| 26 |
which of the following has smaller size: |
<p class="MsoNormal">Fe+<sup>3<o:p></o:p></sup></p>
<p class="MsoNormal">Fe+<sup>2<o:p></o:p></sup></p>
<p class="MsoNormal">Fe+<sup>1<o:p></o:p></sup></p>
<p class="MsoNormal">Fe<sup><o:p></o:p></sup></p>
|
| 27 |
The bond length b/w atoms of hydrogen in the hydrogen molecules is: |
7.54 nm.
0.0754 nm.
0.754 nm.
0.00754 nm.
|
| 28 |
When two hydrogen atoms approach each other. |
Forces of attraction operate.
Forces of repulsion operate.
Forces of attraction and repulsion operate simultaneously.
Nothing happens.
|
| 29 |
According to modern theory of chemical bonding atoms form bonds as it leads to a: |
First decrease then increase in energy.
Decrease in energy.
No energy change.
Increase in energy.
|
| 30 |
Which of the following compound is no formed according to octet rule: |
<p class="MsoNormal">KrF<sub>2<o:p></o:p></sub></p>
<p class="MsoNormal">XeF<sub>2</sub><o:p></o:p></p>
<p class="MsoNormal">XeO<sub>3</sub><o:p></o:p></p>
<p class="MsoNormal">SF<sub>6</sub><o:p></o:p></p>
|
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