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___ is the property by which an element tends to form chains of identical atoms.

What do you mean by atomicity? Classify it with a suitable example.

The positively and negatively charged ions are called as _____ and _____ respectively.

How does a gas differ from vapour ? Also give example.

Among crystallisation and evaporation which is the best method?support your answer

Match the following reactions:-

$\begin{array}{cccc}& \text{Reaction Names}& & \text{Reactions}\\ \text{i}& \text{Displacement reaction}& & {\text{A. CaO + O}}_2\to {\text{2Ca(OH)}}_2\\ \text{ii}& \text{Decomposition Reaction}& & {\text{B. Fe + Pb(NO}}_3{)}_2\to {\text{Fe(NO\_3)}}_2\text{+ Pb}\\ \text{iii}& \text{Redox Reaction}& & {\text{C. MgCl}}_2{\text{+ Ca(OH)}}_2\to {\text{Mg(OH)}}_2{\text{+ CaCl}}_2\\ \text{iv}& \text{Combination Reaction}& & {\text{D. KClO}}_3\to {\text{2KCl + 3O}}_2\\ \text{v}& \text{Double Displacement Reaction}& & {\text{E. CO}}_2{\text{+ H}}_2\to {\text{2CO + H}}_2\text{O}\end{array}$

Carbon dioxide is a mixture a compound and not a mixture explain

Match the following:

$\begin{array}{cccc}\left(i\right)& \text{Can have variable composition of constituent elements}& \left(A\right)& \text{Compound}\\ \left(ii\right)& \text{\_\_\_\_\_\_ is new substance formed due to reaction of two constituent elements}& \left(B\right)& \text{Mixture}\\ \left(iii\right)& \text{Constituent elements can be separated easily}& \left(C\right)& \text{Element}\\ \left(iv\right)& \text{Can be separated only by chemical or electrochemical reactions}& & \\ \left(v\right)& \text{Composition is always fixed}& & \\ \left(vi\right)& \text{Shows properties of constituent elements}& & \end{array}$
The correct pairs are:-

Difference between sedimentation and decantation

Which of the following substance do not form a solution with water?

Read the following and select one the correct answer:

Statement I: Alkali metals dissolve in liquid ammonia to give a blue solution

Statement II: Alkali metals dissolve in liquid ammonia to give solvated species of the type $\left[Na\right(N{H}_3{)}_n{]}^{+}$

The molecular formula of methane is ______.

Size of the nucleus is:

Give reason for the following :

(a) Silver nitrate solution is kept in coloured bottles.

(b) Molybdenum is used in the manufacture of ammonia.

(c) Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.

Name two alkalies that can displace hydrogen. Give balanced equations for the same. Why are the metals you have used considered to have unique nature.

$H_{3}B{O}_3$ is:

On the basis of chemical properties, matter is classified into___.

The charge of alpha particles is:

Which element has the highest first ionization energy?

Which of the following shows maximum number of oxidation states?

LPG cylinder can withstand a pressure of 14.9 atm. The pressure gauge of the cylinder reads 12 atm at 27^°C. Due to a sudden fire in the building the temperature rises. Are what temperature will the cylinder explode?

Solute when dissolved in water:

The amount of energy required to remove the
electron from a Li²⁺ ion in its ground state is how many times
greater than the amount of energy required to remove the electron from an
H-atom in its ground state?