Chemistry Mcqs No 4


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

(1)Pentanol, C5H11OH, has four structural isomers that are primary alcohols. How many of these primary alcohols contain a chiral carbon atom?
A 0
B 1
C 2
D 3

(2)The diagram shows the structure of the naturally-occurring molecule cholesterol.
cholestrol structure

Student X claimed that the seventeen carbon atoms in the four rings all lie in the same plane. Student Y claimed that this molecule displays cis-trans isomerism at the C=C double bond. Which of the students are correct?
A both X and Y
B neither X nor Y
C X only
D Y only

(3)Aldehydes and ketones are carbonyl compounds. Which of them react with NaBH4 and react with Fehling’s reagent?
A both aldehydes and ketones
B aldehydes only
C ketones only
D neither aldehydes nor ketones

(4)The value of the second ionisation energy of calcium is 1150 kJ mol–1
Which equation correctly represents this statement?
A Ca(g) → Ca2+(g) + 2e− ; ∆H o = +1150 kJ mol–1
B Ca+(g) → Ca2+(g) + e− ; ∆H o = +1150 kJ mol–1
C Ca+(g) → Ca2+(g) + e− ; ∆H o = –1150 kJ mol–1
D Ca(g) → Ca2+(g) + 2e− ; ∆H o = –1150 kJ mol–1

(5)The gas laws can be summarised in the ideal gas equation
                                              pV = nRT
0.56 g of ethene gas is contained in a vessel at a pressure of 102 kPa and a temperature of 30 °C. What is the volume of the vessel?
A 49 cm3
B 494 cm3
C 48 900 cm3
D 494 000 cm3

(6)Propanone has the molecular formula C3H6O.
The enthalpy change of combustion of hydrogen is –286 kJ mol–1
The enthalpy change of combustion of carbon is –394 kJ mol–1
The enthalpy change of combustion of propanone is –1786 kJ mol–1.
Using this information, what is the enthalpy change of formation of propanone?
A –1106 kJ mol–1
B –540 kJ mol–1
C –254 kJ mol–1
D +1106 kJ mol–1

(7)Under which set of conditions is a gas most likely to behave ideally?
ideal gas conditions


(8)The oxide of titanium, TiO2, is used as a ‘whitener’ in toothpaste. It is obtained from the ore iron(II) titanate, FeTiO3.
What is the change, if any, in the oxidation number (oxidation state) of titanium in the reaction                           FeTiO3 → TiO2?
A It is oxidised from +3 to +4
B It is reduced from +3 to +2
C It is reduced from +6 to +4
D There is no change in the oxidation number.

(9)The oxides BaO, CaO, MgO and SrO all produce alkaline solutions when added to water. Which oxide produces the saturated solution with the highest pH?
A BaO(aq)
B CaO(aq)
C MgO(aq)
D SrO(aq)

(10)What trend is observed on descending Group VII?
A The colours of the elements become lighter
B The elements become more volatile
C The hydrides of the elements become more thermally stable
D The reactions of the elements with hydrogen become less vigorous.


Post a Comment

Sponsored

Powered by Blogger.