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Why according to bohr's atomic model, an electron does not emit radiation while moving in a stationary state?

Write about the various separation techniques of a mixture with applications ‚ principles and example of each

Hydrogen is readily adsorbed by the _______ at room temperature.

Question 1 (ii)
Write down the formulae of:
(ii) Aluminium chloride

Which of the following is not present as dissolved gases in water?

Complete the following table relating to the atomic structure of some elements.

$\begin{array}{cccccc}\text{Element}& \text{Atomic}& \text{Mass}& \text{Number of}& \text{Number of}& \text{Number of}\\ \text{Symbol}& \text{Number}& \text{Number}& \text{Neutrons}& \text{Electrons}& \text{Protons}\\ Li& 3& 6& & & \\ Cl& 17& & 20& & \\ Na& & & 12& & 11\\ Al& & 27& & & 13\\ S& & 32& 16& & \end{array}$

Calculate the molecular mass of chloroform $\left(CHC{l}_3\right)$.

(Atomic masses: C = 12 u; H = 1 u; Cl = 35.5 u)

$NaOH$ is a strong base because:

In a kingdom there was an excellent archer. The ruler was jealous of his archery skills, so he decided to put his skills to test. The archer was asked to shoot an apple which was placed on his son's head or else his son will be killed. The archer always used his trusted bow.

Now that his son's life was in his hands the archer's hand started to tremble. So, now when he started shooting with the original bow he hit different spots which were close to the apple. In this case the archer is:

Calculate Molality (in $M$) of a solution in which 36 gm glucose is dissolved in 500 gm water.

1. 2

What do we call those particles which have more or less electrons than the normal atoms ?

1. 2

Detergents are ammonium or sulphonate salts of long chain _________.

The mixture of carbon monoxide and dihydrogen is called _________

In this equation 3BaCl2 + Al2(SO4) gives 2AlCl3 + 3Ba(SO4). how in reactants side chlorine is Cl2 ( chloride) but on products side chlorine becomes Cl3 ( chlorine) and Al2 becomes Al .

Platinum, gold and silver are used to make jewellery and are often termed as ___.

Complete the following reactions :

(a) $S+O_2⟶$

(b) $C+O_2⟶$

(c) $2H_2+O_2⟶$

How many moles are $9.033\times {10}^{24}$ atoms of helium?

Name the process which can be used to recover salt from an aqueous salt solution.

The valency of Phosphorus is/are:

(a) Define

(i) Henry's law

(ii) Crystallization.

(b) State the different methods of crystallization.

This material was used excess that led to its decline

A solid X liquifies at 25degree celsius.

It again changes back to it's solid state at 20degree Celsius.

So, Do you agree with the statement? Justify your answer.

What is dark matter and how much do we know about it?

What is the difference between atom and molecule?

Which of the following is the physical state of a salt that dissolves in water and forms a solution?

one atomic mass unit (amu) = _____ kg

Which of the following process will convert unsaturated solution into saturated solution?

What is an electron? State its relative mass and charge.

For the values of P vs V plotted at three different temperatures, the following three curves were obtained. Arrange the values of the temperatures $T_1,T_2$ and $T_3$ in the correct order.

Question 11
Which of the following represents a correct chemical formula? Name it

$\left(a\right)$ $CaCl$
$\left(b\right)$ $BiP{O}_4$
$\left(c\right)$ $NaS{O}_4$
$\left(d\right)$ $NaS$

Choose the heteroatomic molecule of the given options:

What is difference between molecule , atom and mole

How would you separate a mixture of salt and water ?

Write a short note on BEC (3 marks)

What is the Weight of a molecule of the compound C₆₀H_122?

The volume-temperature relationship is given by _______ .

When an electron jumps from L (n=2) to K (n=1) shell ___ is released.

Can we drink liquid oxygen?if no then why

Alkanes undergo ___ reactions.

An astronaut gets thirsty on the moon. So, he makes water by mixing hydrogen and oxygen. Will the mass ratio of hydrogen to oxygen present in the water, he made on the moon, be the same as that on the earth?

Question 12

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid.
(ii) Sublimation of dry ice.
(iii) Condensation of water vapours.
(iv) Evaporation of water.

(a) (i) and (iii)
(b) (ii) only
(c) (iii) only
(d) (ii) and (iv)

Hydrogen does not react with: