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Environmental pollution is worsened by the release from automobile exhausts of?
What is the decrease in volume of air when pyrogallol is shaken with 30.00cm\(^3\) of air ?
Pure solvents are obtained by
Deliquescent substances are used for
The pollution from petroleum spillage in rivers and lakes can best be dispersed by
Which of the following statements is correct about the average kinetic energy of the molecules of a gas?
An element X with relative atomic mass 16.2 contains two isotopes \(^{16}_{8}\)X with relative abundance of 90% and \(^{m}_{8}\)X with relative abundance of 10%. The value of m is
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements is a metal?
Millikan's contributions to the development of atomic theory is the determination of
An oxide XO\(_2\) has a vapour density of 32. What is the atomic mass of X?
Cancerous growths are cured by exposure to
A particle that contains 9 protons, 10 neutrons and 10 electrons is a
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
[H = 1, O = 16]
25cm\(^3\) of a gas X contains Z molecules at 15\(^0\)C and 75 mmHg. How many molecules will 25cm\(^3\) of another gas Y contain at the same temperature and pressure?
P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5 and 6 respectively which of them loses electrons least readily?
Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be deduced that X
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
Allotropes of an element differ in their
A plastic which cannot be softened by heat is described as
Biotechnology is applied in the following except