Your Virtual Mentor| Question | Options |
|---|---|
| The equation for the reaction between aqueous lead (II) nitrate and aqueous potassium iodide is shown Pb(NO3)2(aq) (colourless) +2Kl(aq) (colourless) ? PbI2 (S) (yellow) + 2 KNO3 (aq) (colourless) which method would be used to separte the product ? | Chromatography, Crystallisation, distillation, filtration |
| A 25 cm3 sample of dilute sulphric acid contains 0.025 mole of the acid.what is the hydrogen ion concentration in the solution ? | 0.25 mol /dm3, 0.50 mol /dm3, 1.00 mol /dm3, 2.00 mol /dm3 |
| for which of the following can graphite be used ? | as an abrasive only, as an abrasive and as an electrode, as an electrode and as a lubricant, as a l |
| The letter X,Y and Z represent different atoms 40/19X 39/19 Y 40/20 Z what can be deduced from the proton number and nucleous number X,Y and Z ? | X and Y are the same element, X and Z are the same element, X has more protons then Y, Z has more |
| How does a magnesium atom form a bond with an oxygen atom ? | By giving one pair of electrons to the oxygen atom, by sharing one pair of electron,both electron p |
| Element X and Y combine to form the gas XY2 what are X and Y ? | Calisium , chlorine, Carbon ,hydrogen, Carbon , oxygen, Hydrogen , oxygen |
| Which of the following contains the same number of electrons as an atom of neon ? | Cl-, Li, Li+, O2- |
| Which sulphide contains the greatest mass of sulphur in a 10 g sample ? | NiS , 90, FeS2 ,120 , MoS2 ,160, PbS , 239 |
| 124 g of phosphorus vapour has the same volume as 71 g of chlorine at the same temperature and pressure What is the formula of a molecule of phosphorus ? | P8, P4, P2, P |
| A piece of metal is to be electroplated.which set of condition gives the thickest plate ? | A.c , low , short, d.c , high , long, a.c , high , short, d.c , low ,long |
| Rubidium is above sodium in the reactivity series what is formed when concentrated aqueous radium chloride is electrolysed? | Chlorine , hydrogrn, Hydrogen , chlorine, hydration , chlorine, Rubidium , chlorine |
| Substance X libertes iodium from aqueous potassium iodide and decolourises acidified aqueous potassium manganate VII how is the behiour of X described ? | as an oxidising agent only, as an oxiding agent nor a reducing agent, as a reducing agent only, as a |
| Salts are made by reacting acids and based is the titration method of preparation suitable? | an insoluble acid with an insoluble base, an insoluble acid with insoluble base , a soluble acid wit |
| A black powder is burned in air the gas produced dissolved in water to form solution R the pH of R.the pH of r is closed to 7 the gas is readily absorbed in aqueous sodium hydroxise .what type of substance is present in solution R ? | Strong acid, Strong base, Weak acid, Weak base |
| Which statement about the periodic table is correct : | A melting point of the element increase down Group I, The reactivity of the element increases down G |
| In which process is a cataalyst not used ? | The blast furance for the manufacture of iron, The contract process for the manufacture of sulphric |
| Why is cryolite Na3Alf6 used in the extraction of aluminum from aluminium oxide ? | To dissolve aluminum oxide, To prevent the anode from burning away, To prevent the oxidation of alu |
| The carbonate of metal X is a white solid .it decomposes when heated .Carbon dioxide and a yellow solide and a yellow solide oxide are formed what is metal X ? | Copper, Iron, Lead, sodium |
| An 80 cm3 sample of air is trapped in a syringe .The air is slowly passed over heated iron in a tube until there is no futher decrease in volume when cooled to the orignial temperature which volume of gas remains ? : | 80 cm3, 64 cm3, 20 cm3, 16 cm3 |
| in the Haber process , nitrogen and hydrogen react form ammonia what is the source of the hydrogen ? | Air, Oil, Limestone, Sulphric acid |
| which reaction will not occur using cold dilute sulphric acid ? | formation of copper (II) sulphate from copper (II) oxide, formation of copper (II) sulphate from cop |
| Why are catalytic converters fitted to car exhausts ? | To decrease the amount of carbon dioxide emmitted, To decrease the amount of nitrogen oxide emmitted |
| why is carbon used in the purfication of drinking water ? | disinfect the water, filter out solids, removes tastes and odour from the water, desalinates the wat |
| what is produced when ethanol is boiled with an excess of acidified potassium dichromate VI ? | ethane, Ethanoic acid, ethene, ethyl ethanoate |
| when 1 volume of gas X react with exactly 5 volume of oxygen it form carbon dioxide and water only . What is the gas X ? | methane, CH4, ethane, C2H6, Propane, C3H8, Butane C4H10 |
| Amino acid are produced when protein are : | hydrolysed, Oxidised, Polymerised, Dubstituted |