Which of the following typically represents a photochemical reaction?
- A. Formation of water from hydrogen and oxygen molecules
- B. Conversion of dinitrogen (IV) oxide to nitrogen (IV) oxide
- C. Decomposition of calcium hydroxide to its oxide
- D. Conversion of silver halides to grey metallic silver
The sulphide which is insoluble in dilute hydrochloric acid is
- A. FeS
- B. CuS
- C. ZnS
- D. Na2S
In the industrial production of H2 from natural gas the CO2 produced along with the H2 is removed by
- A. washing under pressure
- B. drying over phosphorus (V) oxide
- C. passing the mixture into lime water
- D. using ammonical copper (I) chloride
The characteristic colour of the flame shown when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is
- A. lilac
- B. green
- C. yellow
- D. brick-red
Which of the following pairs of substance will react further with oxygen to form a higher oxide?
- A. CO2 and H2O
- B. NO and H2O
- C. CO and CO2
- D. SO2 and NO
The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is
- A. Ca2+
- B. Mg2+
- C. Zn2+
- D. Cu2+
Dynamic equilibrium describes a situation where
- A. a reaction gives back the reactant
- B. te concentration of the reactant and products is equal
- C. both forward and and reverse reactions proceed at the same rate
- D. reactants are converted to products
The efficiency of a solid catalyst to increase reaction rates depends on its
- A. surface area
- B. solubility
- C. concentration
- D. quantity
Carbon exist naturally in the combined state as?
- A. graphite
- B. coal
- C. diamond
- D. wood
The group IA metals are not found free in nature because they
- A. are very reactive and unstable
- B. are malleable and ductile
- C. have high melting and boiling point
- D. conduct heat and electricity
On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?
- A. Ca(NO3)2
- B. Cu(NO3)2
- C. AgNO3
- D. NaNO3
The raw materials used for the smelting of iron ore in a furnace is
- A. CaSO4
- B. CaCO3
- C. CuSO4
- D. Zn(NO3)2