|
A crystalline salt when heated becomes anhydrous and losses 51.2%
|
|
2
|
23230
|
June 29, 2020
|
|
Calculate the volume of 1.00 mol ${{L}^{-1}}$ aqueous sodium hydroxide that is neutralised by 200 mL of 2.00 mol ${{L}^{-1}}$ aqueous hydrochloric acid arid the mass of sodium chloride produced
|
|
2
|
4459
|
June 18, 2018
|
|
To account for atomic mass of nitrogen as 14.0067, what should be the ratio of 15N and 14N atoms in natural nitrogen?
|
|
2
|
6229
|
October 23, 2017
|
|
A compound made up of two elements A and B
|
|
1
|
9477
|
December 17, 2016
|
|
The density of the water at room temperature
|
|
1
|
2175
|
December 17, 2016
|
|
A 0.005 cm thick coating of copper is deposited on a plate
|
|
1
|
2185
|
December 17, 2016
|
|
The average molar mass of a mixture of methane
|
|
1
|
4090
|
December 17, 2016
|
|
Determine the molecular formula of an oxide of iron
|
|
1
|
4490
|
December 17, 2016
|
|
Calculate the total number of electrons present in 1.6 g of methane
|
|
0
|
4552
|
December 17, 2016
|
|
In three moles of ethane , calculate the following
|
|
1
|
1692
|
December 17, 2016
|
|
Calculate the molecular mass of the following
|
|
1
|
724
|
December 17, 2016
|
|
A compound on analysis
|
|
1
|
6701
|
December 17, 2016
|
|
A flask P contains 0.5 mole of oxygen gas
|
|
1
|
4331
|
December 17, 2016
|
|
Calculate the number of moles in the following masses
|
|
1
|
3754
|
December 17, 2016
|
|
Chlorophyll, the green colouring matter of plants contains 2.68% magnesium by weight
|
|
1
|
13040
|
December 17, 2016
|
|
What is the molecular mass of a substance each molecule
|
|
1
|
3837
|
December 17, 2016
|
|
Which one of the following will have the largest number of atoms?
|
|
1
|
1111
|
December 17, 2016
|
|
Calculate the atomic mass (average) of chlorine using the following data
|
|
1
|
1803
|
December 17, 2016
|
|
Calculate the molar ratios of two acids in the original mixture
|
|
1
|
1421
|
December 17, 2016
|
|
The following data are obtained when dinitrogen and dioxygen
|
|
1
|
2957
|
December 17, 2016
|
|
Describe what you need to do in the laboratory to test
|
|
1
|
1768
|
December 17, 2016
|
|
A box contains some identical red coloured balls, labelled as A
|
|
1
|
4666
|
December 17, 2016
|
|
Does the above data correspond to the law of constant composition?
|
|
1
|
1172
|
December 17, 2016
|
|
If two elements can combine to form more than one compound
|
|
1
|
3014
|
December 17, 2016
|
|
Two oxides of a metal contain 27.6% and 30.0% of oxygen respectively
|
|
1
|
2640
|
December 17, 2016
|
|
Perform the following calculations
|
|
1
|
1032
|
December 17, 2016
|
|
Express the following in scientific notation
|
|
1
|
1260
|
December 17, 2016
|
|
Convert the following into basic units
|
|
1
|
2234
|
December 17, 2016
|
|
Air contains 20% oxygen by volume
|
|
1
|
4472
|
December 17, 2016
|
|
5.975 g of the higher oxide of metal gave 5.575 g of lower oxide on heating
|
|
1
|
3288
|
December 17, 2016
|