What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of…
What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air ? A.…
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Pure solvents are obtained by
Pure solvents are obtained by A. Distillation B. Condensation C. Extraction D. Evaporation Correct Answer: Option A Explanation
Deliquescent substance are used for
Deliquescent substance are used for A. Cooling B. Wetting C. Melting D. Drying Correct Answer: Option D Explanation
Which of the following statements is correct about the average kinetic energy of the molecules…
Which of the following statements is correct about the average kinetic energy of the molecules of a gas?…
The pollution from petroleum spillage in rivers and lakes can best be dispersed by
The pollution from petroleum spillage in rivers and lakes can best be dispersed by A. Pouring detergents B.…
An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance…
An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance of 90% and…
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which…
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements…
Millikan’s contributions to the development of atomic theory is the determination of
Millikan’s contributions to the development of atomic theory is the determination of A. charge on electron B. positive…
An oxide XO2 has a vapour density of 32. What is the atomic mass of…
An oxide XO2 has a vapour density of 32. What is the atomic mass of X? A. 32…
Cancerous growths are cured by exposure to
Cancerous growths are cured by exposure to A. γ – rays B. β – rays C. α –…