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The colour of methyl orange in alkaline medium is?
Calculate the volume of 0.5 mol dm\(^{-3}\) H\(_2\)SO\(_4\) that is neutralized by 25 cm\(^3\) of 0.1 mol dm\(^3\) NaOH?
The acid that is used to remove rust is?
Carbon (II) oxide is considered dangerous if inhaled mainly because it?
Coffee stains can best be removed by?
Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120°C?
[Cu = 64, S = 32, O = 16]
Substance employed as drying agents are usually?
Permanent hardness of water can be removed by?
A noble gas with a high power of fog penetration used in aerodrome beacons is?
12D + 13T → 24He + 01n + energy
The reaction above illustrates?
Elements in the same period in the periodic table have the same?
The maximum number of electrons in the L shell of an atom is?
The stability of the noble gases is due to the fact that they?
How many unpaired electron(s) are there in the nitrogen sub-levels?
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the?
The volume of a given gas is V cm\(^3\) at a pressure P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature?
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the?
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]
Which of the following is an example of a mixture?