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For the reaction $C_2{H}_6\left(g\right)+n{O}_2⟶C{O}_2\left(g\right)+H_{2}O\left(l\right)$, the ratio of the coefficients of $C{O}_2$ and $H_{2}O$ is:

What is the general name of the elements having 8 electrons in the valence shell of their atoms ?

Why was carbon 12 chosen over oxygen for atomic mass if oxygen was so suitable?

If we pour hot water on dry ice it will tur into fog. Why?

Passage of Ammonia gas through copper sulphate solution forms pale blue precipitate of ___ .

The given compound is

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

Among the three gases, which gas is collected at last?

To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293K. Find its concentration at this temperature.

There are five beakers placed A, B, C, D, and E with the following temperatures?

What is the maximum number of electrons which can be accommodated in the L shell of an atom?

Which of the following is not a mixture ?

(a) Kerosene (b) air (c) alcohol (d) petrol

Fill in the blanks :

(a) The process of a liquid changing into a solid is called_______________

(b) A change which alters the composition of a substance is known as a _______________ change

(c) There is no change in the ____________of the substance during a physical change.

(d) The reaction in which energy is evolved is called_______________

State whether the following statement is true or false : Radioactive isotope of iodine is used for making the medicine called tincture iodine.

At what temperature solid ice and liquid water coexist ?

I want understand about the weak nuclear and strong nuclear force that was stated in this chapters video

Write the following is in the form of a word equation:
Sodium hydroxide reacts with calcium bromide to form calcium hydroxide and sodium bromide.In the formula $CaB{r}_2$ what does $Ca$ stand for and what is its valency?

Nitrogen gas and nitrogen compounds, both are very important for:

How to write chemical formulas of compounds which has more than two components

The clear liquid which is left behind in the beaker after settling down of the sediments is called:

Match the following and choose the correct answer
$\begin{array}{cc}\text{(i)}\text{Solid}& \text{(a)}\text{Super energetic particles}\\ \text{(ii)}\text{Liquid}& \text{(b)}\text{No shape nor fixed volume at a given pressure}\\ \text{(iii)}\text{Gas}& \text{(c)}\text{Has definite shape}\\ \text{(iv)}\text{Plasma}& \text{(d)}\text{Definite shape with less molecular forces than that in solids}\end{array}$

The boiling point of water is ${100}^{\circ }$ C. Express this in SI units (Kelvin scale).

In the Haber process, Nitrogen and Hydrogen react to form Ammonia.

Which factor increases both the speed of reaction and the amount of Ammonia produced?

(a) Define efflorescence. Give examples.

(b) Define deliquescence. Give examples.

Question 7
Sketch the cross section of soil and label the various layers.

5 ml of N HCl, 20 ml of $N/2H_{2}S{O}_4$ and 30 ml of $N/3HN{O}_3$ are mixed together and volume made to one litre. The normality of the resulting solution is

Define valency and valence shell.

A crystalline substance 'P' is a water soluble salt. It forms insoluble salt on reaction with magnesium chloride. The chemical formula of 'P' is:

Why is water considered a compound?

Which of the following can be separated by using a separating funnel and which cannot be separated by using a separating funnel?

(a) water and kerosene mixture

(b) water and acetone mixture

Give reasons for your answer.

Mixture of sulphur and carbon disulphide is

a. homogeneous and does not show Tyndall effect

b. Heterogeneous and show Tyndall effect

Your answer to same question in the question bank option is a but explanation is of d

A block of ice at -10 degree Celsius is slowly heated and converted to steam at 100 degree Celsius. Which of the following curves represents the phenomenon qualitatively?

Aarush checked the atomic mass and molecular mass of 3 substances and noted it in the tabular form as shown below. What will be the atomicity of X, Y and Z?

Which of the following is correct about the balanced equations?

Question 2(a)
Verify the following:

$18\times [7+(-3\left)\right]=[18\times 7]+[18\times (-3\left)\right]$

Write a very short note on

1---valancy

2---- AMU

The smell of hot sizzling good reaches us several metres away, but to get the smell from cold food we have to go closer? Why?

During manufacture of Hydrogen through the Bosch Process, separation of carbon dioxide can be done by: