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Write electronic configuration for the following elements.

${}_8^{16}O$ , ${}_{14}^{28}Si$, ${}_{17}^{35.5}Cl$, ${}_{18}^{40}Ar$

Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?

What is\are the reactants for the chemicals equation forming Caustic soda?

Increase in amount of $C{O}_2$ in air results in _____________.

Why is the valency of hydrogen positive?

Give reasons for the following

1. Heating hydrated copper sulphate crystal is deemed a chemical change.

2. Efflorescence is minimum during humid conditions.

A. Cleaner nations will become richer and their economies grow faster than dirty nations.
B. If Africa were to burn its own coal reserves, the resultant carbon emissions would cause trillions of dollars of damage to the rest of the world.
C. A global carbon market will create a new global system of economic values
D. But if the developed world can't clean up the globe on its own, it can create market conditions that make reduction in carbon emissions an economic priority for every nation
E. Of course, the US - and all developed nations for that matter - can't solve the emissions problem alone.

Atomic number is equal to:

Is the melting point temperature of the solid state and the freezing point of temperature of the liquid state of the substance different ?give reason to support your answer.

Which of the following structures represents neoprene polymer ?

What would younobseyou when a saturated solution of potassium chloride prepared at 60 celsusc is allowed to cool to room temperature?

Plasma is the ________ state of matter.

Conductance of 0.1 M KCl (conductivity = x $oh{m}^{-1}c{m}^{-1}$)
filled in a conductivity cell is y $oh{m}^{-1}$. If the conductance of 0.1 M NaOH filled in the same cell is z $oh{m}^{-1}$, molar conductance of NaOH will be :

Which one of the following methods is used to separate cream from milk?

Cathode rays are negatively charged particles because they are attracted to the ___ plate of the cathode ray tube.

Nitric acid acts as a good solvent for a large number of metals. This property of nitric acid helps in:

Air is dense at sea level. This is an application of ___.

Calculate the molecular masses of the following compounds:

(a) Methanol, $C{H}_{3}OH$

(b) Ethanol, $C_2{H}_{5}OH$

How many elements are there which are in gaseous state at room temperature?

Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?

(A) Oxides (B) Chlorides (C) Hydrides (D) Sulphites

Choose the correct option regarding the statements given below:

Statement 1: On increasing the temperature of a reaction, the effective collision of molecules increases.

Statement 2: Temperature increase the number of molecules with the threshold energy.

The reaction of Quicklime turning into Slaked Lime is ___ which turns___ .

In water, the proportion of oxygen and hydrogen by mass is :

Write the balanced chemical equations for the following reactions-

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide $\left({\text{Cu}}_2{\text{I}}_2\right)$, liberates iodine gas and also forms potassium sulphate.

Examples of mixtures 5

Which of the following pair are members from the same group of periodic table?

The number of valence electrons in a sulphide ion, $S^{2-}$, is :

(a) 16

(b) 10

(c) 9

(d) 8

Some examples of metalloids and their uses

Which property of nitric acid is involved when it is used to etch copper and brassware ?

Molecular compounds can be found in all three states of matter at room temperature. Which molecular compound is liquid at room temperature?

(a) What are polyatomic ions? Give two examples.

(b) Name the fundamental law that is involved in every equation.

In a laboratory which is the other compound that is used along with sulphuric acid to produce nitric acid?

Question 10
Which one of the following properties is not generally exhibited by ionic compounds?
(a) Solubility in water
(b) Electrical conductivity in solid state
(c) High melting and boiling points
(d) Electrical conductivity in molten state

Is phosphate a polyatomic ion

Why do acids, bases and salt conduct electricity?

The number of molecules present in $4.25grams$ of $N{H}_3$ is approximately:

The 'sea water' can be classified as a homogeneous mixture as well as a heterogeneous mixture. Comment.

State one condition necessary to liquefy gases (other than applying high pressurel)

The electronic configuration of Neon is?

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(c) Metal with valency 2.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

Statement I: Iron and wood are two different substances.

Statement II: Atomic configuration of iron and wood are same but their arrangement in the subsequent substance is different.

Explain the application of isotope with diagram and examples