chemistry mcqs test no 2


There are 10 Mcqs.Choose the best option.Write all of your answers in one comment (like 1A,2B,3B...)

(1)Which graph represents the number of unpaired p orbital electrons for atoms with proton numbers 13 to 18?
graph of unpaired p orbital electrons
(2) Choose the correct order of C-C bond length.
A ethane>ethene>benzene
B ethyne>ethene>benzene
C ethyne>ethene>benzene
D ethane>benzene>ethene

(3)In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the attacking group and of the leaving group?
attacking group and eaving group


(4)Which ester is formed when the alcohol CH3CH2OH is reacted with CH3CH2CH2CO2H?
A ethyl propanoate
B ethyl butanoate
C propyl ethanoate
D butyl ethanoate

(5)An ideal gas obeys the gas laws under all conditions of temperature and pressure. Which of the following are true for an ideal gas?
1 The molecules have negligible volume.
2 There are no forces of attraction between molecules.
3 The molecules have an average kinetic energy which is proportional to its absolute temperature.
A 1 only
B 2 and 3
C 3 only
D 1,2,3

(6)Which properties in the sequence hydrogen chloride, hydrogen bromide and hydrogen iodide steadily increase?
1 thermal stability
2 bond length
3 ease of oxidation
A 1 and 2
B 2 and 3
C 3 and 1
D only 3

(7)Which gas closely approaches ideal behaviour at room temperature and pressure?
 A ammonia
B carbon dioxide
C helium
D oxygen

(8)What could be the proton number of an element that has three unpaired electrons in each of its atoms?
A 5
B 13
C 15
D 21

(9)Some bond energy values are listed below
bond energy values

These bond energy values relate to the following four reactions.
P Br2 → 2Br
Q 2Cl → Cl2
R CH3 + Cl → CH3Cl
S CH4 → CH3 + H
What is the order of enthalpy changes of these reactions from most negative to most positive?
A) P → Q → R → S
B) Q → R → S → P
C) R → Q → P → S
D) S → P → Q → R

(10)Ammonium nitrate, NH4NO3, can decompose explosively when heated.
                                                     NH4NO3 → N2O + 2H2O
What are the changes in the oxidation numbers of the two nitrogen atoms in NH4NO3 when this reaction proceeds?
A –2, –4
B +2, +6
C +4, –6
D +4, –4



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