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Intermolecular hydrogen bonding increases the enthalpy of vapourization of a liquid due to

Ice is a solid and solid have a high density but ice floatson water. Why?

Sir sometimes while making formulas, if valency are in multiples they get divided so how to know the actual valency of the compunds. What will be the valency of Nitrogen and Oxygen in NO.

Your Sincerely

Abhyodaya Dubey

Consider the following statements

Which of the above statements are correct?

An element B has 5 protons and 6 neutrons. What will be the symbol of the element B?

Three identically shaped deflated balloons are attached to the mouth of three empty glass tubes, I, II and III. Each test tube is placed inside a glass tumbler containing water. All the three glass tumblers contain the same amount of water that has been heated to attain different temperatures of T₁, T₂ and T₃respectively.

The temperature is the highest in test tube II and the lowest in test tube III. The temperature in test tube I is in between II and III.

After some time, changes were observed in the volume of air inside the balloons.

It is observed that the volume of air inside the balloon attached to test tube

Thomson compared atom to watermelon (or plum pudding) and thus derived some conclusions.Which of the following are his conclusions?

The quantity of matter in a body regardless of its volume or of any force acting on it is called its ________.

When alpha particles are sent through a thin metal foil, only one out of ten thousand rebounded. What did this observation lead to?

The melting point of carbon dioxide gas is _____.

The ratio of difference between $3^{rd}$ and $2^{nd}$ orbit of H atom and $L{i}^{2+}$ ion is

Discuss how the structure of the atom developed over the years. [5 MARKS]

In a laboratory, Jar A is filled with a colourless acid. Jar B is filled with pale yellow acid. Which jar is filled with hydrochloric acid?

Question 35
Compare the radii of two elements X and Y. Give reasons for your answer.

(a) X has 12 protons and 12 electrons

(b) Y has 12 protons and 10 electrons

Definition of dilute solution

The balanced chemical equation for the reaction of zinc metal with hydrochloric acid is:

$561d{m}^3$ fo a gas at S.T.P. is filled in a $748d{m}^3$ container. If temperature is constant, calculate th epercentage change in pressure required.

How vapours are different from gaseous state

For any liquid, vapor pressure increases with increase in:

Find the number of hydrogen atoms in $9.033\times {10}^{23}$ molecules of water.

Which of the following actions does not release carbon dioxide?

How will you separate a mixture containing sand and sugar ?

Find the percentage of water of crystallization in $CuS{O}_4.5H_{2}O$.

Which of the following electronic configuration represents a noble gas?

Absolute scale of temperature is reproduced in the laboratory by making use of a:

What is saturated solution and how can we make an saturated solution?

The following statements regarding characteristic of carbon dioxide $\left(C{O}_2\right)$ are true except that it is:

A student heats 25g of reactant 'A' with 50g of reactant 'B'. He obtains 50g of product 'C' and recovers 25 g of unreacted 'B'. Which of the following law is confirmed in the following reaction?

Question 1
Which one of the following sets of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

The following diagram shows the various shells. The maximum number of electrons that can be accomodated in M shell is _______ .

The geometric form of crystals is the result of orderly arrangement of _____

Which of the following statements is true if red hot iron is reacted with steam?

Which of the following elements has 17 electrons and 17 protons?

Sodium

Sulphur

Aluminium

Chlorine

Nitrogen is a