Chemistry

An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is 6.0g cm^-3. The number of atoms in 180g of the element is_________* 10²³ (Nearest integer)

In the given reaction,

X + Y + 3Z           XYZ₃

If one mole of each of X and Y with 0.05 mol of Z gives compound XYZ₃. (Given: Atomic masses of X, Y and Z are 10, 20 and 30 amu, respectively.) The yield of XYZ₃ is_____________g.

The geometry around boron in the product 'B' formed from the following reaction is

          $B{F}_3+NaH\stackrel{450K}{\to }A+NaF$  

          A + NMe₃ $\stackrel{}{\to }B$  

Choose the correct order of density of the alkali meals:

The reaction of H₂O₂ with potassium permanganate in acidic medium leads to the formation of mainly.

The compound(s) that is (are) removed as slag during the extraction of copper is:

(A) CaO                        

B) FeO

C) Al₂O₃                                 

(D) ZnO

(E) NiO

Choose the correct answer from the options given below.

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f¹⁴6d¹7s² is:

Match the List-I with List-II

Choose the correct answer from the options given below:

20 mL of 0.1 M NH₄Oh is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to: (Given K_b (NH₄OH) = 1 * 10^-5, log2 = 0.30, log3 = 0.48, log5 = 0.69, log7 = 0.84, log11 = 1.04

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^-1 is $0.0405°C.$  Density of formic acid is 1.05 g mL^-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water $K_f=1.86kkgmo{l}^{-1}$ )