Chemistry Physics Biology

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When 0.1 mol MnO4 -2 is oxidised, the quantity of electricity required to completely oxidise MnO4 -2to MnO4 - is

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 x 10-19 C)

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas usinga current of 3 amperes is (in min)

The number of Faradays (F) required to produce 20 g of calcium from molten CaCl, (Atomic mass of Ca = 40 g mol) is

On electrolysis of dil. sulphuric acid using platinum (Pt) electrode, the product obtained at anode will be

Which of the following pairs constitutes a buffer?

In a buffer solution containing equal concentration of B- and HB, the Kb for B- is 10 -10, The pH of buffer

A buffer solution is prepared in which the concentration of NH3is 0.30 M and the concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 x 10 -5 what is the pH of this solution? (log 2.7 = 0.43)

Buffer solutions have constant acidity and alkalinity because

The dissociation constant of a weak acid is 1 x 10 -4 In order to prepare a buffer solution with a pH = 5, the [Salt]/[Acid] ratio should be

The radioactive isotope of phosphorus, P-32, is used in molecular biology and biochemistry for

Which p-block element is responsible for the distinctive color in fireworks displays?

What is the name of the most stable and common allotrope of sulfur?

Which p-block element is commonly used as a reducing agent in metallurgical processes, especially for the extraction of metals from their ores?

What is the general trend in the acidity of oxides across the p-block elements from left to right in the periodic table?

Among the halogens, which one has the lowest boiling point?

Which p-block element is used in the manufacture of semiconductors and is a crucial component in the electronics industry?

What is the name of the red allotrope of phosphorus that is used in the production of safety matches?

Which p-block element is known for forming a variety of oxoacids and their salts, known as "polyoxoacids"?