Metals which react with steam only when they are red-hot include
- A. copper
- B. sodium
- C. calcium
- D. gold
- E. iron
The function of limestone in the extraction of iron in the blast furnace is
- A. removal of the earthly impurities
- B. decomposition of the iron ore
- C. conversion of iron (lll) to iron (ll) compounds
- D. generation of heat for the process
- E. conversion of coke to carbon(ll)oxide
Which of the following is an alloy of mercury?
- A. Stainless steel
- B. Soft solder
- C. Coinage bronze
- D. Amalgam
- E. Duralumin
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
- A. CH3CH2OH
- B. (CH3)2CHCH2OH
- C. (CH3)3CCH2OH
- D. (CH3)3COH
- E. CH3CH2CH2CH2OH
In which of the following processes are larger molecules broken down into smaller molecules?
- A. Vulcanization of rubber
- B. Hydrogenation of palm oil
- C. Hydrolysis of starch
- D. Polymerization
- E. Esterification
The gas produced when a mixture of sodium propanoate and soda lime is heated is
- A. methane
- B. pentane
- C. ethane
- D. butene
- E. ethyne
Fructose and glucose are classified as carbohydrates because they
- A. are crystalline white solids
- B. are energy -giving substances
- C. are naturally occurring organic compounds
- D. contain carbon oxygen and hydrogen
- E. conform to the general formula Cx(H2O)y
The following can be obtained directly from the destructive distillation of coal except
- A. ammoniacal liquor
- B. coke
- C. producer gas
- D. coal gas
- E. coal tar
Which of the following is hydrocarbons is unsaturated?
- A. Ethane
- B. Benzene
- C. Propane
- D. 2 - methylbutane
- E. 2,2,4-trimethylpentane
The following statements about graphite are correct except that it
- A. is used as a lubricant
- B. has a network structure
- C. contains mobile free electrons
- D. is good conductor
- E. is an allotrope of carbon
H3O+(aq) + OH-(aq) → 2H2O(l). The heat change accompanying the process represented by the equation above is the heat of
- A. neutralization
- B. formation
- C. solution
- D. dilution
- E. hydration
Which of the following is not correct of the reaction represented by the equation below? 2C(s) + O2(g) → 2CO(g); ∆H = – xKJ
- A. there is an increase in entropy ;
- B. There is anincrease in gaseous volume
- C. Carbon (lV) oxide is produced
- D. The oxidation number of carbon increases from 0 to +2
- E. The reaction is exothermic
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
- A. 64g
- B. 32g
- C. 12.8g
- D. 6.4g
- E. 3.2g
What mass of copper will be deposited by the liberation of Cu2+ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]
- A. 64g
- B. 32g
- C. 12.8g
- D. 6.4g
- E. 3.2g
Sodium chloride cannot conduct electricity in the solid state because it
- A. is a normal salt
- B. is highly soluble in water
- C. is an electrovalent compound
- D. does not have any effect on litmus
- E. does not contain mobile ions
Alums are classified as
- A. simple salt
- B. acid salts
- C. anhydrous salts
- D. double salts
- E. basic salts
Consider the reaction represented by the equation below: XO + YO → X + YO2 In the reaction, YO acts as
- A. an acidic oxide
- B. a basic oxide
- C. a reducing agent
- D. a weak base
- E. an oxidizing agent
A positive brown ring test indicates the presence of
- A. NO 3
- B. Fe 3+
- C. SO 2-3
- D. CU+
- E. NO- 2
The most suitable method for preparing lead (ll) chloride is by
- A. action of dilute HCI on PbSO 4
- B. acts of dilute HCI on lead
- C. action of dilute HCI on PbCO3
- D. bubbling chlorine into a solution of Pb(NO3)2
- E. mixing aqueous solutions Pb(NO3)2 and NaCI.
Which of the following species is always present in acidified water?
- A. NH+4
- B. O 2-
- C. HCI
- D. H3O+
- E. HNO3
A weak acid is one which
- A. is not corrosive
- B. is slightly ionized in water
- C. does not produce salts with alkalis
- D. does not conduct an electric current in aqueous solution
- E. forms acid salts with bases