chemistry for grade 7\\

7. 1.375 g of cupric oxide on reduction in hydrogen gas gives 1.098 g of copper. In another experiment, 1.179 g of metallic copper produced 1.476 g of copper oxide. Show that these results illustrate the law of constant proportion..

16. What is the solubility of Ag 2 CrO 4 in water if the value of solubility product, K s p = 1.7 x 10 - 1 1 (mol / L) 3 ..

Borax (Na 2 B 4 O 7 .10H 2 O) Borax occurs naturally as tincal (contains about 55% borax) in certain inland lakes of India, Tibet and California (U.S.A...

Magnesium sulphate is a colorless, efflorescent crystalline substance having a bitter taste. It is isomorphous with ZnSO 4 .7H 2 O. Magnesium sulphate is readily soluble in water (35.5 g of the salt dissolves in 100 g of water at 20C)..

The elements of the third period contain d-orbitals also in addition to s- and p-orbitals. The 3d-orbitals are comparable in energy to the 3s- and 3p-orbitals. These d-orbitals are also involved in the hybridization and they explain the geometries of molecules of elements of third period. Thi..

This involves the mixing of one s three p and three d-orbitals forming seven sp 3 d 3 hybrid orbitals having pentagonal bipyramidal geometry. The geometry of IF 7 molecule can be explained on the basis of sp 3 d 3 Hybridizati..

Aldehydes and ketones are generally prepared by oxidation of primary and secondary alcohols respectively. Common oxidising agents are KMnO 4 , K 2 Cr 2 O 7 and CrO 3 . Strong oxidising agents oxidise the aldehyde produced by the oxidation of a primary alcohol to carboxylic aci..

Fluorine forms two oxides F 2 O and F 2 O 2 , which are called oxygen fluorides. In this case fluorine is more electronegative than oxygen. On the other hand the oxides of Cl, Br and I are called oxides. They form oxides from + 1 to + 7 oxidation state..

True Solutions, Suspensions and Colloids - A true solution is a homogeneous solution in which the solute particles have diameters less than 10 - 7 cm. i.e., the solute particles are of molecular dimensions. The particles are invisible even under powerful microscopes. For example, sodium c..

sp 3 d 3 Hybridization - This involves the mixing of one s three p and three d-orbitals forming seven sp 3 d 3 hybrid orbitals having pentagonal bipyramidal geometry. The geometry of IF 7 molecule can be explained on the basis of sp 3 d 3 Hybridizati..