Arrange the following elements in the increasing order of their metallic character Mg, Ca, K Answer - Mg < Ca < K

If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride? [CBSE 2019] Answer - The...

Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev. Answer – GeCl4, GaCl3

How many vertical columns are there in the Modern Periodic Table? Answer - In the Modern Periodic Table, there are 18 vertical columns of...

Define groups. Answer - The vertical columns in the long form of the Periodic Table are called groups.

What was the drawback of the Law of Octaves? Answer - Law of Octaves failed to assign the position to the elements with large atomic...

State Newlands' Law of Octaves. Answer - Newlands' Law of Octaves states that "when elements are arranged in order of increasing atomic...

State Mendeleev's Periodic Law. [CBSE 2019] Answer - Mendeleev's Periodic Law states that, "The physical and chemical properties of the...

What was Dobereiner's basis of classifying elements? Answer - According to Dobereiner, elements having similar properties can be arranged...

1. Differentiate between adsorption and absorption. 2. Physisorption is reversible while chemisorption is irreversible. Why ? 3. What is...

1. Define Linkage Isomerism. Give an example of linkage isomerism. 2. Define Coordination Isomerism. Give an example of coordination...

Important questions from Alcohol, Phenol and Ethers 1. Write the structure of the molecule of a compound whose IUPAC name is...

Top 10 Question for Board Exam - 01 Chapter – Solution 1. Define the following terms molarity, molality and mole fraction. What is the...

1. Which stoichiometric defect does not change the density of the crystal? 2. What type of stoichiometric defect is shown by AgCl? 3....

Top 10 Question for Board Exam - 01 Chapter - Solid State 1. “Crystalline solids are anisotropic in nature.” What does this statement...

Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a...

Explain the mechanism of the cleaning action of soaps. Solution: There are so many impurities and dirt mixed in water, and most of all...

What change will you observe if you test soap with litmus paper (red and blue)? Solution: When we test soap with litmus paper colour of...

Explain the formation of scum when hard water is treated with soap? Solution: Scrum is produced from reaction of hard water with soap....

Why are carbon and its compounds used as fuels for most applications? Solution: Carbon and its compounds used as fuels for most...