Catalytic hydrogenation of benzene produces?
- A. an aromatic hydrocarbon
- B. margarine
- C. cyclohexane
- D. D.D.T
Palm wine turns sour with time because?
- A. the sugar content is converted into alcohol
- B. the carbon (IV) oxide formed during the fermentation process has a sour taste
- C. it is commonly adulterated by the tappers and sellers
- D. microbial activity results in the production of orgain acids within it
The carbon atoms on ethane are?
- A. sp2 hybridized
- B. sp3 hybridized
- C. sp2d hybridized
- D. sp hybridized
Al2O3(s) + 3H2SO4(aq) → Al2(SO4(aq)) + 3H2(I)O
Al2O3(s) + 2NaOH(aq)) + 3H2(I)O → 2NaAl(OH)4(aq)).
We can conclude from the equations above that Al2O3(s) is?
- A. an acidic oxide
- B. an amphoteric oxide
- C. a basic oxide
- D. a neutral oxide
It is not desirable to use lead tetraethyl as an anti-knock agent because?
- A. it is expensive
- B. of pollution effects from the exhaust fumes
- C. it lowers the octane rating of petrol
- D. it is explosive
The fraction of crude oil used as jet fuel is?
- A. refinery gas
- B. diesel oil
- C. kerosene
- D. gasoline
The active reducing agent in the blast furnace for the extraction of iron is?
- A. carbon
- B. limestone
- C. carbon(II)oxide
- D. calcium oxide
Copper metal will react with concentrated trioxonitrate (V) acid to give?
- A. Cu(NO3)3 + NO + N2O4 + H2O
- B. Cu(NO3)2 + NO + H2O
- C. CuO + NO2 + H2O
- D. Cu(NO3)2 + 2NO2 + 2H2O
Bronze is an alloy of?
- A. silver and copper
- B. silver and gold
- C. copper and nickle
- D. copper and zinc
- E. copper and tin
When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.
The products of this reaction are?
- A. PbO(s) + Br- + KNO3
- B. Br2 + NO2(g) + PbBr2(s)
- C. PbO(s) + K+(aq) + Br(aq) + NO2(g)
- D. PbBr2(s) + K(aq) + K+(aq) + NO3(aq)
Which of the following is a property of ionic chlorides?
- A. They can be decomposed by heat
- B. They react with aqueous AgNO3 to give a white precipiate which is soluble in excess ammonia
- C. They explode when in contact with dry ammonia
- D. They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas
An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?
- A. passed over heated copper (II) oxide
- B. bubbled through concentrated tetraoxosulphate (IV) acid
- C. bubbled through sodium hydroxide solution
- D. bubbled through water
Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?
- A. Silver and trioxonitrate (V)
- B. Sodium trioxonitrate (V)
- C. Calcium trioxonitrate (V)
- D. Lithium trioxonitrate (V)
Which of these gases can be dried with concentrated H2SO4?
- A. HBr
- B. H2S
- C. NH3
- D. SO2
NaCI(s) + H2SO4(I) → HCI(g) + NaHSO4(s).
In the reaction above, H2SO4 behaves as?
- A. a strong acid
- B. an oxidizing agent
- C. a good solvent
- D. a dehydrating agent
10g of a solid is in equilibrium with its own vapour.
When 1 g of a small amount of solid is added, the vapour pressure?
- A. remains the same
- B. drops
- C. increases by 1%
- D. increases by 99%
The standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol– are -394, -242 and -110 respectively. What is the standard enthalpy change for the reaction CO(g) + H2(g)O → CO2(g) + H2(g)?
- A. -42 KJ mol-
- B. +42 KJ mol-
- C. -262 KJ mol-
- D. +262 KJ mol-
A reaction takes places spontaneously if?
- A. ∆G = O
- B. ∆S < O and ∆H > O
- C. ∆H < T ∆S
- D. ∆G > O
The oxidation states of chlorine in HOCL, HCLO3 and HCLO4 are respectively?
- A. -1, +5, and +7
- B. -1, -5 and 7
- C. +1, +3 and +4
- D. +1, +5 and +7
Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?
- A. OH- - e → OH
- B. CIsup>- - e → CI
- C. OHsup>- + CIsup>-HCI + O2
- D. Na+ - esup>- Hg (Na)/(Hg) amalgam
During the electrolysis of a salt of a metal M, a current of 0.5 A flows from for 32 minutes 10 seconds and deposits 0.325 g of M, What is the charge of the metal ion?
(M = 65, If = 96,500 C per mole of electron)
- A. 1
- B. 2
- C. 3
- D. 4