Chemistry

Calamine and Malachite, respectively, are the ores of:

Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d⁵.

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

Given below are two statements:

Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Statement II : The nucleophillic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.

In the light of the above statements, choose the most appropriate answer from the options given below:

The oxide without nitrogen-nitrogen bond is:

Water sample is called cleanest on the basis of which one of the BOD values given below:

In the following sequence of reactions,

$C_3{H}_6\stackrel{H^{+}/H_{2}O}{\to }A\underset{dilKOH}{\overset{K{\rm I}O}{\to }}B+C$            

The compounds B and C respectively are:

In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is _________.

Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is __________ * 10^-1 M. (Nearest integer)

[Atomic mass : Na = 23.0, O = 16.0, H = 1.0]