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The most common ores of iron include
which of the following gives a precipitate when treated with NaOH solution?
Leads is used for making bullets and lead shots because of its
When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of
Which of the following compounds of trioxonitrate (V) will decompose to give dinitrogen (i) oxide and water when heated?
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is
The rate of a reaction usually decreases with a decrease in the concentration of reactants because
A catalyst speeds up the rate of chemical reaction by
Which of the following reaction is endothermic?
\(NH_{3(g)} + HCl_{(g)} → NH_4Cl_{(s)}\)
The entropy change in the system above is
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
What is the IUPAC nomenclature of the compound NaCIO?
The oxidation state of carbon in HCOOH is
Insoluble salts can be prepared by?
0.05 mol dm-3 HCl is neutralized by 25 cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base
The basicity of CH3COOH is
What is the pH of 0.001 mol dm-3 solution of sodium hydroxide
The uncovered raw food that is sold along major roads is likely to contain some amounts of
117.0g of sodium chloride was dissolved in 1.0dm3 of distilled water at 25°C. Determine the solubility in mol dm-3 of sodium chloride at that temperature
[Na = 23, Cl = 35.5]