Maths Group11

Which of the following statement is true about alkane and alkene?

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___________.

Given the sequence: 1, 6, 11, 16, 21, ... What is the sum of the first 20 terms of the sequence?

Which of the following defines an arithmetic sequence?

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 ?

Which one of the following is the longest period in the periodic table?