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A dense white fume is formed when ammonia gas reacts with
When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is
The density of a certain gas is 1.98gdm\(^{-3}\) at s.t.p. What is the molecular mass of the gas?
What is the valence shell electron configuration of the element with atomic number 17?
I. Treatment of cancer
II. Detection of leakages in water mains
III. Detection of the ages of ancient tools
IV. Preparation of drugs
Which combination of the above refers to the uses of radioactive isotopes?
The pressure of 100cm\(^3\) of oxygen at 35\(^0\)C is 750mmHg. What will be the volume of gas if the pressure is reduced to 100mmHg without changing the temperature?
A heterogenous mixture can be defined as any mixture
An element will readily form an electrovalent compound if its electron configuration is
The component of an atom that contributes least to its mass is the
Sugar is separated from its impurities by
Which of these properties gives a solid its definite shape?
The shape of the hydrocarbon compound CH\(_4\) is
How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and
The gas that is the most dangerous pollutant to human is
Kerosene is commonly used to remove the red colour stain of palm oil from cloths because it
The air around smelting industries is likely to contain
The solubility curve shows the variation of solute concentration with
25cm\(^3\) of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?
When water boilers are used for long period of time, the solid substances left behind as scale are