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WorksheetsOGUN STATE JUNIOR SCIENCE OLYMPIAD FINAL CHEMISTRY
Total questions: 20
Worksheet time: 10mins
Which of the following is the unhybridized orbital in sp2 carbon hybridization?
2px
2py
2pz
All of the above
Find the coefficient of oxygen in the balanced chemical reaction of NH3+O2→NO2+H2O .
1
4
3
7
In which of the following will the reaction occur rapidly?
Between ions in aqueous solution because little energy is needed to break the bonds since the ions are already dissociated
Between all gases because they have greater average kinetic energy
Each of the reactants has a mass of 5 g. Which of the following specie is the limiting reactant in the equation 2KMnO4+5Hg2Cl2+16HCl→2MnCl2+10HgCl2+8H2O+2KCl ?
Hg2Cl2
KMnO4
H2O
HCl
If an Endothermic is placed in air, the temperature of the surrounding will ___ with time
Decrease
Increase
Remain constant
Zero
Temperature change of in a chemical reaction is as a result of exchange of heat
between System and surrounding
between System and universe
between Universe and surrounding
Within the system
Arrange in the order of proximity to the nucleus
Sp < sp2 < sp3
Sp > sp2 > sp3
Sp3 < Sp2 < Sp
If E° of a cell is −1.00V , the reaction is?
Spontaneous
Non spontaneous
Has ΔG to be +ve
Has ΔG to be -ve
Convert 123∘C to Kelvin
396 K
300 K
273 K
246 K
An endothermic reaction is happening in a closed system at a rapid rate. If it is put into the surrounding, the temperature of the environment __________
Decreases
remains unaffected
Increases
Px, Py and Pz are referred to as degenerate orbitals because?
They have the same energy level
They have the same orientation
If two orbitals have the same (n+l) values, the one with the lower energy has lower
Magnetic quantum number
Spin quantum number
Azimuthal quantum number
Principal quantum number
What is the electronic configuration of Carbon?
1s2 2s2 2px2
1s2 2s1 2px1 2py1
1s2 2s2 2px1 2py1
Calculate the mass of copper deposited at the cathode in the electrolysis of CuSO4 by 1 F (Cu = 63.5)
15.88 g
31.75 g
63.50 g
47.63 g
Calculate the number of F used in the deposition of 21.58 g of Ag at the cathode (Ag = 107.9)
0.10 F
0.20 F
0.50 F
1.00 F
Calculate the value of 6.00% of NiSO4 of a solution that contains 40 g of NiSO4
2.40 g
6.00 g
0.60 g
4.00 g
Which of the following refers to the breakdown of a heavy isotope into two or more smaller isotopes with the release of energy
Nuclear transmutation
Electron capture
Nuclear fission
Nuclear fusion
Which heat change is the most positive?
Combustion
Vaporization
Fusion
Sublimation
Which endothermic change will be the greatest for 5 g of H2O
Condensation
Melting
Vaporization
Freezing
Which physical property differentiates atoms that are isotopes?
Electronic configuration
Mass number
Cannot remember
