Chemical reactions and oxidation states quiz

Chemistry Notes

• Boric acid is a protonic acid.
• Beryllium exhibits a coordination number of six.
• Chlorides of both beryllium and aluminum have bridged chloride structures in the solid phase.
• B2H6.2NH3 is known as 'inorganic benzene'.

Silanes

• R2SiCl2 is the substituted silane that will give rise to cross-linked silicone polymer on hydrolysis.

Compound Formula

• In a compound, atoms of element Y form a ccp lattice, and those of element X occupy 2/3rd of tetrahedral voids, the formula of the compound is X3Y4.

Sentence Rearrangement

• The correct sequence of the sentence is: "She saw her opportunity to borrow some sugar when he came to her home to make amends."

Resume Design

• Designing a resume for eye appeal is crucial, and the objective is to create an arrangement of type and space that appeals to the eye.
• There is no best arrangement, but a good procedure is to approach the task as a graphic designer would.

Organic Chemistry

• Phenol, when it first reacts with concentrated sulfuric acid and then with concentrated nitric acid, gives 2,4,6-trinitrobenzene.
• The reaction mixture so formed contains a mixture of o− and p−bromotoluenes.

Actinoids and Lanthanoids

• Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, due to lesser energy difference between 5f and 6d than between 4f and 5d orbitals.

Metallurgy

• Roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly is due to metal sulphides being less stable than the corresponding oxides.

Carbohydrates

• α-D-(+)-glucose and β-D-(+)-glucose are anomers.

Mathematics

• If the age of the father 10 years ago was thrice the age of his son, and ten years hence, the father's age will be twice that of his son, then the ratio of their present ages is 7:3.
• The average weight of A, B, and C is 45 kg, and the average weight of A and B is 40 kg, and that of B and C is 43 kg, then the weight of B is 26 kg.
• If Abhay takes 2 hours more than Sameer to cover a distance of 30 km, and if Abhay doubles his speed, he would take 1 hour less than Sameer, then Abhay's speed is 6.25 kmph.
• If it takes eight hours for a 600 km journey, with 120 km done by train and the rest by car, and it takes 20 minutes more if 200 km is done by train and the rest by car, then the ratio of the speed of the train to that of the car is 3:4.