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
|