- 1. The minimum amount of energy required for a chemical reaction to occur is known as the ----------
A) Energy of reaction
B) Energy of formation
C) Free energy
D) Activation energy
- 2. The collision theory proposes that :
A) All collisions of reactants are effective
B) The fewer the collision the faster the rate of chemical reaction rate
C) Reactants collide more frequently to bring about a reduction in the rate of reaction
D) Reactant must collide with a certain amount of energy to form products
- 3. If the rate depends on the square of the concentration of "A" , then it is referred to as --------
A) First order reaction
B) Zero order reaction
C) Fourth order reaction
D) Second order reaction
- 4. If the rate of reaction is proportional to the concentration of a reactant "A", then the reaction is a ----------
A) Second order reaction
B) First order reaction
C) Zero order reaction
D) Fourth order reaction
- 5. When the concentration of the reactant does not affect the rate of reaction, it is referred to as --------
A) Zero order reaction
B) Fourth order reaction
C) First order reaction
D) Second order reaction
- 6. The sum of the powers of the concentration of the reactants which appear in the rate equation is known as -----
A) Reaction mechanism
B) Molecularity
C) Collision
D) Order reaction
- 7. The number of molecules , atoms, radicals or ions taking part in the rate determining step is known as ---------
A) Rate determining step
B) Reaction mechanism
C) Rate of reaction
D) Molecularity
- 8. The type of reaction where the reactant particles absorb light energy and react rapidly in a series of chain reactions is referred to as ------
A) Photochemical reaction
B) Collision
C) Order of reaction
D) Rate of reaction
- 9. A substance which alters the rate of chemical reaction but remains chemically unchanged at the end of the reaction is called -------
A) Energetics
B) Activation energy
C) Enthalpy
D) Catalyst
- 10. The graphical representation of the energy changes in the course of a chemical reaction is known as -------------
A) Energy barrier
B) Reaction profile
C) Activated complex
D) Rate curve
- 11. Which of the following metals will react with cold water to produce hydrogen gas ?
A) Aluminium
B) Copper
C) Magnesium
D) Calcium
- 12. Hydrogen gas is not found in the atmosphere because it readily reacts with .............
A) Nitrogen (IV) oxide
B) Carbon (II) oxide
C) Oxygen
D) Nitrogen
- 13. Which of the following pairs of elements forms amphoteric oxides?
A) Si and Pb
B) Zn and Al
C) Be and Mg
D) Na and K
- 14. Oxygen can be prepared in the laboratory by heating..........
A) NaHCO3
B) CaCO3
C) NaNO3
D) KClO3
- 15. When chlorine is added to slaked lime, the product obtained is........
A) Oxochlorate (I) acid
B) Chlorinated water
C) Trioxochlorate (v) salt.
D) Bleaching powder
- 16. Nitrogen (I) oxide is different from oxygen because..........
A) It is fairly soluble in water
B) It is less dense than oxygen
C) It thermally decomposes before it rekindles glowing splint.
D) It is only laughing gas.
- 17. Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen-containing compounds because the former contains .......
A) Rare gases
B) Carbon (iv) oxide
C) Water vapour
D) Oxygen
- 18. When chlorine is passed into hot concentrated sodium hydroxide solution, the products formed are ........
A) NaClO3 and H2O
B) NaClO, NaCl, and H2O
C) NaClO3, NaCl, and H2O
D) NaClO3, NaClO, and H2
- 19. When a lighted splint was introduced into a test tube containing an unknown gas, a pop sound was heard and a pale blue flame was observed. The unknown gas is ........
A) Hydrogen
B) Nitrogen
C) Chlorine
D) Oxygen
- 20. Hydrogen is readily released when dilute hydrochloric acid reacts with ......
A) Cu
B) Ag
C) Na
D) Au
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