Chemistry Test ...

The major role of fluorspar (CaF₂) which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite (Na₃AlF₆) is :

I. to act as a catalyst

II. to make the fused mixture very conduction

III. to lower the temperature of melting

IV. to decrease the rate of oxidation of carbon at the anode

Subatomic particle discovered by J. Chadwick was :

0.5 molal solution acetic acid (M.W. = 60) in benzene (M.W. = 78) boils at 80.80 °C. The normal boiling point of benzene is 80.10 °C and Δ_vap H = 30.775 KJ/mol. Which of the following option is correct regarding percent of association of acetic acid in benzene.

Which of the following is/are example(s) of reversible reaction?

Calculate the number of atoms present in 71g of Cl₂.

Which one of the following ions is the most stable in aqueous solution?

(At. No. are: Ti = 22, V = 23, Cr = 24, Mn = 25)

For the reaction between KMnO₄ and H₂O₂, the number of electrons transferred per mol of H₂O₂ is?

Electronic configuration of only one P block element is exceptional. One molecule of that element consists of how many atoms of it?

A gas X at 1 atm is bubbled through a solution containing a mixture of 1 M Y− and 1 M Z− at 25 C. If the reduction potential of Z > Y > X then _____________.

Which one of the following statements is incorrect?