Chemistry MCQ Quiz Hub

1. Order of reaction of 2N2O5 ? 2N2O4+O2 is
First order
Second order
Third order
zero order

2. For 3rd order reaction the hhalf life is inversely proportional to initial concentration of reactants
Single
Square
Cube
Raise to power four

3. Which order of reaction obeys the relation t1/2 = 1/Ka
First order
Second order
Third order
Zero order

4. Radiations are absorbed in
Spectrophotometer method
Dilatometric method
Optical relation method
Refractometric method

5. Activated complex is formed due to
Pressure
Effective collision
Ineffective collisions
Temperature

6. Energy of reactant higher than energy of product favours
Endothermic
Exothermic
Moderate reaction
No reaction

7. Energy required to form transition state is called
Ea
P.E
V
K.E

8. Which of the following will have very high rate of reaction?
Double decomposition reaction
Neutralization reaction
Ionic reactions
all of above

9. Greater the conc. Of reactant
Greater will be dx/dt
Lesser will be dx/dt
dx/dt will be moderate
any of above

10. Anything which increases rate of reaction without being involved in the reaction
Promoter
Catalyst
Inhibitor
All of the above

11. The substances that reduces the effectiveness of a catalyst are called
Promoters
Poisoning catalysts
Inhibitors
pro-catalysts

12. When catalysts and reactants are in more than one phase it is
Homogeneous catalysis
Heterogeneous catalysis
Catalysis
Ea

13. Each catalyst has
Specificity
Special structure
Its own Ea
all of above

14. Biocatalytical proteins are
Enzymes
Substrate
Lipids
any of above

15. A catalyst can not effect
Products
Chemical equilibrium
Reactants
both a & b

16. An enzyme has its specificity due to
Substrate
Structure
Temperature
Pressure

17. Co-enzymes are
Non proteineous
Proteineous
sugars
lipids

18. A substance which increases the reactivity of enzyme is called
Promoters
Inhibitors
Stimulators
Non-activators

19. Addition of tetraethyl lead in petrol is example of
ve catalysis
?ve catalysis
auto catalysis
anti catalysis

20. When a product acts as catalyst then it is called
Autocatalsis
?ve catalysis
ve catalysis
self catalysis

21. End name of enzyme is
yl
ase
one
al

22. When the reaction completes in more than one steps rate of reaction will be determined by
Fast step
Slowest step
All steps
Molecularity of the reaction

23. For determining the order of reaction we use
Refractometric method
Dilatometric method
Optical activity method
Half life method

24. Energy of activation for backward reaction is less than forward reaction for ________ reaction
Endothermic
Exothermic
Moderate
Fast

25. The unit of slope in Arrhenius plot to calculate the energy of activation is
K-1
?F
K
?C

26. Which statement is incorrect about catalyst
it is used in smaller amount
decrease activation energy
specific in action
it affects specific rate constant

27. Which of the following type of reaction is 3rd order reaction
2N2O5 = 2N2O4 + O3
NO + O3 ? NO2 + O2
2FeCl3 + 6KI ? 2FeI2 + 6KCl + I2
None of these

28. Boron is non-netal whereas A1 is metal. It is due to
Small size
High nuclear charge
Both a and b
No authorized justification yet

29. Boron in soil has been considered micronutrient for
Soil porocity
Proper growth of plants
Alkalinity of soil
All

30. One of the outstanding features of boron is its ability to form
Molecular addition compounds
Molecular crystals
Semiconductors
Ionic compounds

31. Substance which is found in dried up lakes of Tibet and California is
Tincal
Boric acid
Calcium carbonate
Colemanite

32. Borax is a white crystalline solid and it is
More soluble in cold water
More soluble in hot water
Insoluble in water
Soluble only in organic solvents

33. Which of the following does not give Borax bead test?
Cu
Cr
Ni
A1

34. Special features of borate glass is that it is
Heat resistant
Low melting
Used to prepare chemical garden
Green in colour

35. The metal which is used in thermite process because of its activity is
iron
copper
aluminium
zinc

36. Aluminium oxide is
Acidic oxide
Basic oxide
Amphoteric oxide
It does not exists

37. Which of the following shows inert pair effect?
boron
carbon
silicon
tin

38. Which electronic configuration corresponds to an element of group IIIA?
1s2 2s2 2p3
1s2 2s2 2p6 3s2 3p1
1s2 2s2 2p4
1s2 2s2 2p6 3s2 3p6 4s2 3d1

39. Tincal is a mineral of
A1
Si
B
C

40. In network of silica (SiO2) each silicon atom is surrounded by _________ atoms of osygen
4
2
1
6

41. Which one of the following is not a semiconductor?
Si
Ge
Se
Sn

42. Orthoboric acid is 2.6% soluble in water at 40?C and ________at 107?C.
26%
27%
37%
<2.6%

43. The process of aluminium extraction is called
Hall process
Thermite process
Haber process
Contact process

44. Because of its ability to combine with both oxygen and nitrogen aluminium metal is used
As nitrometer
To remove air bubbles from molten metal
To produce alloy
As insulator

45. Aqueous solution of borax above 62?C gives crystals of
Na2B4O7.4H2O
Na2B4O7.5H2O
Na2B4O7.2H2O
Na2B4O7.10H2O

46. Silicon differ from silica by a group of
Ch3
?OH
OCH3
O2

47. Which of the following is not a use of silicon?
Lubricants
Hydraulic brakes
Antifreeze
Water repellent

48. Boron is non metal while other elements of IIIA group are metals. This is because
it has small size
it has high nuclear charge
it forms molecular addition compounds
all of the above

49. CO2 is gas while SiO2 is solid at room temperature.
carbon is non-metal while silicon is semi-metal
CO2 is an independent molecule while SiO2 has network covalent structure
CO2 forms multiple bond while silicon does not form multiple bonds
Silicon has all sigma bonds

50. The coloured glassy mass in borax bead test is due to the formation of
metal borate
metal meta borate
metal boride
metal silicate