Maths Group11

What is oxidation?

Sodium and calcium react with water to form hydrogen gas and metal hydroxide. Yet calcium reacts at a moderate, whereas sodium reacts so rapidly. Why do these differences occur? This is due to the difference in:

All of the following are the preconditions that needed for a chemical reaction to occur except___________.

How many grams of oxygen can be prepared by the decomposition of 12 g of mercury (II) oxide? ( Atomic mass: Hg = 200 g/mol, oxygen= 16 g/mol.)

The reactions in which oxidation and reduction do not occur and such types of reactions are known as ___________.

What is the oxidation number of Fe in K₄[Fe(CN)₆] ?

When 20g of sulphur dioxide reacts with oxygen, 23 g of sulphur trioxide is formed. What is the percentage yield?

How many liters of sulphur trioxide are formed when 4800 cm³ of sulphur dioxide is burned in air?

How many moles of CaO are needed to react with excess water to produce 370 g of calcium hydroxide?

For endothermic reactions, change in enthalpy (∆H) is:

Consider the following chemical equation: PCl₅ + H₂O ------>H₃PO₄ + HCl. Then what is the coefficient of HCl after balancing of chemical equation?

How many sigma and pi bonds are there in ethylene ( C₂H₄) ?

What is the molecular shape of BrF₄⁻ ?

What is the molecular geometry of O₃ ?

Consider the following steps: Step1:Juicing Step2:Cleansing and Grinding Step3:Clarifying Step4:Refinery Step5:Evaporation Step6:Crystallization. Step7: Collecting Harvest Which one is the correct sequence during the industrial production of sugar?

In the manufacturing process of cement, in which part of kiln does limestone decompose to calcium oxide?

Which of the following glass is made by heating a mixture of silica, sodium carbonate or sodium sulphate and limestone?

All of the following processes are used to manufacture sodium hydroxide except___________.

What volume of oxygen will react with carbon monoxide to produce 20L of carbon dioxide at STP?

Which of the following conditions is not used to electroplate a tray made of iron with chromium?