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Please give me a short note on vlency I'm not able to understand it.

The figure shows graphs of pressure versus density for an ideal gas at two temperature $T_{1}and{T}_2$ which is correct?

What do you mean by global warming ?

Particles of matter of water at 273 k have more energy as compared to particles of ice at same temparature . Why ?

Which of the following are matter ? chair ,air ,love ,smell ,hate , almonds , thought , cold , cold-drink , smell of perfume.

For the above question , the answer given is :

chair,air,almonds,cold-drink.

But my teacher said that smell of perfume is also a matter.

Is it correct?

One litre of a gas weights 2g at 300 K and 1 atm. pressure. If the pressure is made 0.75 atm, at which temperature will one litre of the same gas weigh 1g

Nitrogen reacts with oxygen at extreme temperatures (around ${2000}^{o}C$) forming Nitric oxide $NO$. Why are such high temperatures required?

Sugar solution is an example of:

Among the following elements, which is the strongest reducing agent?

The alpha particle carry______units of positive charge.

A compass needle is placed below a wire and a current is made to flow through the wire. The needle will

In neutral medium, $KMn{O}_4$ acts as a powerful oxidizing agent according to the reaction:
$2KMn{O}_4+H_{2}O\to 2Mn{O}_2+2KOH+3\left(O\right)$. The change involves

While we move from left to right in a period, what happens to the non-metallic character of the elements?

Convert the temperature of 373°C to the kelvin scale ?

Which molecule is represented by the given electron-dot diagram?

What is the product formed when magnesium nitride, $M{g}_3{N}_2$ reacts with warm water?

Which of the following element cannot form [M(X)₆]^2- type of complex{ Here M is group IV element and X is halide or OH^- ion}

Which of the following is not matter?

(a) Humidity

(b) Hydrogen

(c) Air

I read this question in a book and was not able to find answer.

What is the viscosity of the 4th and 5th state of matter?

What do we call those particles which are formed :
(a) By thegain of electrons by atoms ?
(b) By the loss of electrons by atoms ?

Define 'melting point' of a substance? What is the melting point of ice?

Explain briefly, how gases can be liquefied.

The molecular mass of Na₂CO₃ is:

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be :

(a) W

(b) X

(c) Y

(d) Z

Atomic mass is expressed in:

What is the maximum number of electrons that can be filled in the outermost shell?

Highly pure hydrogen (99.9% ) can be obtained from:

How do you confirm that a colourless liquid given to you is pure water

What are protons and neutrons made up of ?

What is the magnification provided by an electron microscope as against an ordinary compound microscope?

The slow process of conversion of dead organic matter into coal is called ___

Among the following which is an incorrect statement?

According to the law of conservation of mass, 3 g of carbon burnt in 8 g of oxygen forms 11 g of carbon dioxide. Now, what will be the mass of carbon dioxide produced when 3 g of carbon is burnt in 50 g of oxgyen?

In Dobereiner's triad, elements showed similarities in _______ .

The oxidation number of Ca in Ca⁺² is

Why air is consider as mixture but not a compound and why water is consider as compound but not a mixture.

The transition elements have characteristic electronic configuration which can be represented as:

Which among the given options is not a physical property of HCl gas?

When mercuric chloride and potassium iodide are___ in a mortar to produce mercuric iodide.

DOES THE RUBBER BAND SOLID ?

Which of the following components does not get separated by chromatographic technique?

In Rutherford alpha-scattering experiment, a foil of ____________ was used.