|
A crystalline salt when heated becomes anhydrous and losses 51.2%
|
|
2
|
23742
|
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
|
4562
|
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
|
6329
|
October 23, 2017
|
|
A compound made up of two elements A and B
|
|
1
|
9567
|
December 17, 2016
|
|
The density of the water at room temperature
|
|
1
|
2223
|
December 17, 2016
|
|
A 0.005 cm thick coating of copper is deposited on a plate
|
|
1
|
2227
|
December 17, 2016
|
|
The average molar mass of a mixture of methane
|
|
1
|
4125
|
December 17, 2016
|
|
Determine the molecular formula of an oxide of iron
|
|
1
|
4754
|
December 17, 2016
|
|
Calculate the total number of electrons present in 1.6 g of methane
|
|
0
|
4608
|
December 17, 2016
|
|
In three moles of ethane , calculate the following
|
|
1
|
1759
|
December 17, 2016
|
|
Calculate the molecular mass of the following
|
|
1
|
763
|
December 17, 2016
|
|
A compound on analysis
|
|
1
|
6790
|
December 17, 2016
|
|
A flask P contains 0.5 mole of oxygen gas
|
|
1
|
4386
|
December 17, 2016
|
|
Calculate the number of moles in the following masses
|
|
1
|
3811
|
December 17, 2016
|
|
Chlorophyll, the green colouring matter of plants contains 2.68% magnesium by weight
|
|
1
|
13081
|
December 17, 2016
|
|
What is the molecular mass of a substance each molecule
|
|
1
|
3870
|
December 17, 2016
|
|
Which one of the following will have the largest number of atoms?
|
|
1
|
1147
|
December 17, 2016
|
|
Calculate the atomic mass (average) of chlorine using the following data
|
|
1
|
1878
|
December 17, 2016
|
|
Calculate the molar ratios of two acids in the original mixture
|
|
1
|
1474
|
December 17, 2016
|
|
The following data are obtained when dinitrogen and dioxygen
|
|
1
|
3041
|
December 17, 2016
|
|
Describe what you need to do in the laboratory to test
|
|
1
|
2044
|
December 17, 2016
|
|
A box contains some identical red coloured balls, labelled as A
|
|
1
|
4753
|
December 17, 2016
|
|
Does the above data correspond to the law of constant composition?
|
|
1
|
1199
|
December 17, 2016
|
|
If two elements can combine to form more than one compound
|
|
1
|
3075
|
December 17, 2016
|
|
Two oxides of a metal contain 27.6% and 30.0% of oxygen respectively
|
|
1
|
2714
|
December 17, 2016
|
|
Perform the following calculations
|
|
1
|
1083
|
December 17, 2016
|
|
Express the following in scientific notation
|
|
1
|
1297
|
December 17, 2016
|
|
Convert the following into basic units
|
|
1
|
2275
|
December 17, 2016
|
|
Air contains 20% oxygen by volume
|
|
1
|
4524
|
December 17, 2016
|
|
5.975 g of the higher oxide of metal gave 5.575 g of lower oxide on heating
|
|
1
|
3513
|
December 17, 2016
|