1) Rhombic Sulphur

• We find them as yellow and translucent crystals.
• Rhombic Sulphur has a melting point of 114^o C.
• The density of rhombic Sulphur is 2.08 g/cm³
• It is stable at temperatures below 96^oC.

2) Monoclinic Sulphur

• These are transparent and amber crystals.
• They have a melting point of 119^oC.
• The density of monoclinic sulphur is 1.98 gcm³
• It is unstable at temperatures below 96^oC and changes into rhombic form.
• We must remember that at a temperature of 96^oC or above, rhombic sulphur changes to kaleidoscopic or prismatic sulphur. At 96^oC or beneath, kaleidoscopic or prismatic sulphur changes to rhombic sulphur.
• These allotropes that alter their configuration from one form to another by a change in the temperature are Enantiotropic Allotropes.

They r educated,they lives prosperous life .....

The density of material shows the denseness of that material in a specific given area. A material’s density is defined as its mass per unit volume. Density is essentially a measurement of how tightly matter is packed together. 

Mathematically, the density of an object is expressed as follows:

Density=Mass/Volume ρ = mv

Where,

• ρ is the density
• m is the mass
• V is the volume

Mass per unit volume

Preparation of Sulphur Dioxide

1. In the laboratory, sulphur dioxide is prepared by the reaction of metallic sulphite or a metallic bisulphite with dilute acid. For example, a reaction between the dilute sulphuric acid and sodium sulphite will result in the formation of SO₂.

Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂

2. Commercially it is obtained as a by-product released from the roasting of sulphide ores. The gas obtained is dried, liquefied and then stored in steel cylinders.

4FeS₂ (s) + 11 O₂ (g) →2Fe₂O₃ (s) + 8SO₂ (g)

 

Properties of Sulphur Dioxide

• It is a colourless gas with a rotten egg odour. It is highly soluble in water.
• It liquefies easily.
• SO₂ dissolves in water to form sulphurous acid due to which it possesses an acidic character.

H₂O + SO₂ → H₂SO₃

• It does not support combustion nor is it combustible.
• SO₂ is a strong oxidizing agent.

2H₂S + SO₂ → 3S + 2H₂O

• It also acts as a reducing agent.

SO₂ + 2H₂O → H₂SO₄ + 2H

Uses of Sulphur Dioxide

• In the food industries, as a food preservative.
• It acts as a bleaching agent to remove the excess chlorine and as a disinfectant.
• In cold storage plant, it acts as a refrigerant.
• It is used as a reagent and a solvent in the laboratory.

Physical Properties of Ozone – O₃

Odour	Similar to chlorine
Appearance	Pale blue gas
Covalently-Bonded Unit	1
Hydrogen Bond Acceptor	2
Complexity	4.8
Solubility	Soluble in water, CCl4, Sulfuric acid

Uses of Ozone – O₃

• Ozone used at water treatment plants without filtration systems.
• Ozone may also be formed by commonly used equipment such as photocopiers, laser printers, and other electrical devices.
• In medicine, by limiting the effects of bacteria, viruses, fungi, yeast, and protozoa, ozone therapy is used to disinfect and treat diseases.
• Several ozone-depleting compounds possess properties that make them good refrigerants that is, they can efficiently transfer heat from one location to another.

Matching

Yellow rhombic sulphur (α-sulphur) and the monoclinic (β-sulphur). The most interesting feature is their thermal stability, the allotropes of sulphur are inter-convertible i.e. rhombic sulphur when heated above 369K gives monoclinic sulphur.

कठपुतली कविता का मुख्य संदेश है स्वतंत्रता

Social issues are those problems in a society by which a significant population is affected and requires immediate solution. Right from the most basic problem of poverty that kills people physically to the problem of social media that affects children mentally, there are a variety of social issues in the society that have affected considerable amount of population and requires solution urgently.

 

Poverty:

 

It is shocking to note that Global Hunger Index places India on the 97th position in terms of starvation. Statistics also indicate that about 15% of the Indian population is undernourished. Therefore, it has become an undeniable fact that poverty exists in India although the politicians, the media and the general public have failed to recognise it. Food security is the basic right of every citizen and the Government must ensure effective laws to fulfill it.

 

Corruption:

 

Corruption is a social issues which includes the misuse of authority in public and private services for personal gains. It is the root cause for all other social evils and backwardness in the society. Though India is developing into a super power on the one hand, it is being pulled down on many grounds due to corruption. If the general public restrains from offering bribe, then truthfulness and transparency would prevail in the administration. It requires a change from both the corrupted and affected people.

 

Caste System:

 

Caste System discriminates the citizens and causes unnecessary tensions in the society. Though many leaders and stakeholders have been working since independence days, it still remains a social issue. The first step in this direction is the removal of reservations based on caste system. Though inter-caste marriages have been prevalent in the last few decades, the reservations have been adding fuel to the waning caste system.

 

Dowry System:

 

The dowry system has been affecting the women of the society in many ways. Though many pioneers have worked to eradicate this social issue for several decades, it has also been prevalent in the society. Some steps that help overcome this social issue includes economic freedom to women through inheriting family properties and employment. It requires the combined effort of both the offending and affected parties to root out this social evil.

 

Child Labour:

 

This social issue against children prevents the right of a child to enjoy its childhood and attend regular schooling. The inability of parents and selfishness of employers work together to promote child labour. Online help systems have been initiated to locate child labourers, rescue them and provide relief from their suffering. The general public requires more awareness to eradicate this social issue.

 

Uncleanliness:

 

The progress of a society is determined by the cleanliness maintained in public places, workplaces and residences. Cleanliness ensures good health, provides good feeling, promotes confidence and demands respect from others. Uncleanliness, on the other hand, acts as deterrent for the progress and prosperity of the nation as well as demean the society.

 

Other Social Issues:

 

Apart from the social issues listed above, there are a variety of social issues that affect various sections of the society. They include terrorism, human rights issues, issues related to women like female foeticide, discrimination on status, jobs and wages etc., drugs abuse, child abuse, unemployment, population explosion, unrestrained use of social media, etc.

 

Conclusion:

 

Recognition of the social issues is the first step to find solution. Most of the issues are due to lack of awareness and could be addressed through sensitization programs from the Governments and stakeholders. Since many social issues like sati, untouchability etc., have been dealt successfully in the past, the future holds hope to deal with the current social issues.

National capital region

Hahaha

U can get through sample paper

Industrial Method of Preparation

Hydrogen peroxide is prepared by the electrolysis of 30% ice-cold H₂SO₄. When acidified sulfate solution is electrolyzed at high current density, peroxodisulphate is obtained. Peroxodisulphate is then hydrolyzed to get hydrogen peroxide.

2HSO^–₄(aq) [Electrolysis] → HO₃SOOSO₃H(aq) [Hydrolysis] → 2HSO^–₄(aq)+2H+(aq)+H₂O₂(aq)

An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bond to oxygen that can dissociate to produce the H+ cation and the anion of the acid. An oxoacid is an acid that contains oxygen. ... For example, chlorine has the four following oxoacids: hypochlorous acid HClO. chlorous acid HClO. ... perchloric acid HClO.

Sui,scale

Sui ,scale

सूचिका मतलब सुई और मापिका मतलब ruler ( scale

Mapika means ruler ?( scale)

Specific Gravity or relative gravity is a dimensionless quantity that is defined as the ratio of the density of a substance to the density of the water at a specified temperature and is expressed as

SG=ρsubstance/ ρH2O

It is common to use the density of wate<a href="https://byjus.com/physics/density-of-water/">r</a> at 4 ^oC as a reference point as water at this point has the highest density of 1000 kg/m³.

It is also known as relative density... ...it is the ratio of density of a substance to the density of a given reference material..

Vhj

Legendary ye tumne kya likha h mujhe samajh nahi aaya.

Apne muh mia mithu bnna paap hai nhi to uska rasta saaf hau❎❌✖

Mhan insan Like me I am a Legend ?

Physical Properties of Ozone – O₃

Odour	Similar to chlorine
Appearance	Pale blue gas
Covalently-Bonded Unit	1
Hydrogen Bond Acceptor	2
Complexity	4.8
Solubility	Soluble in water, CCl4, Sulfuric acid

Uses of Ozone – O₃

• Ozone used at water treatment plants without filtration systems.
• Ozone may also be formed by commonly used equipment such as photocopiers, laser printers, and other electrical devices.
• In medicine, by limiting the effects of bacteria, viruses, fungi, yeast, and protozoa, ozone therapy is used to disinfect and treat diseases.
• Several ozone-depleting compounds possess properties that make them good refrigerants that is, they can efficiently transfer heat from one location to another.

Mat and rope

Mat and rope

Thanks

Thread

nsgxhs

Yes

Yes

Yes

Leaves

Yes

Ostrich

No

ohh nice Atul....from where uhh have taken this?

CHAPTER TOPICS REMOVED ?UNIT I-NUMBER SYSTEMS 〰️ ?REAL NUMBERS ➡️? Euclid’s division lemma ?UNIT II-ALGEBRA 〰️ ?POLYNOMIALS ➡️?Statement and simple problems on division algorithm for polynomials with real coefficients. ?PAIR OF LINEAR EQUATIONS IN TWO VARIABLES ➡️ ?cross multiplication method ?QUADRATIC EQUATIONS ➡️ ?Situational problems based on equations reducible to quadratic equations ?ARITHMETIC PROGRESSIONS ➡️ ?Application in solving daily life problems based on sum to n terms ?UNIT III-COORDINATE GEOMETRY 〰️ ?COORDINATE GEOMETRY ➡️ ? Area of a triangle. ?UNIT IV-GEOMETRY 〰️ ?TRIANGLES➡️Proof of the following theorems are deleted ?The ratio of the areas of two similar triangles is equal to the ratio of the squares of their corresponding sides. ?In a triangle, if the square on one side is equal to sum of the squares on the other two sides, the angle opposite to the first side is a right angle. ?CIRCLES ➡️No deletion ?CONSTRUCTIONS ➡️Construction of a triangle similar to a given triangle. ?UNIT V- TRIGONOMETRY 〰️ ?INTRODUCTION TO TRIGONOMETRY ➡️ ?motivate the ratios whichever are defined at 0o and 90o TRIGONOMETRIC IDENTITIES➡️ ?Trigonometric ratios of complementary angles. ?HEIGHTS AND DISTANCES➡️No deletion ?UNIT VI-MENSURATION 〰️ ?AREAS RELATED TO CIRCLES ➡️ Problems on central angle of 120° ?SURFACE AREAS AND VOLUMES ➡️ Frustum of a cone. ?UNIT VI-STATISTICS & PROBABILITY 〰️ ?STATISTICS ➡️?Step deviation Method for finding the mean ?Cumulative Frequency graph ?PROBABILITY➡️ No deletion

World depicted in the classroom(Shakespeare,Tyrolese Valley,domes of big cities etc.) is full of love, education and prestige which is just contrary to the world of slum children which is dull , boring and full of sadness. Moreover this tempts these slum children to steal to get this comfort of world of riches.They are the negative influences for them

The hazards of working in the glass bangle industry as follows :

Workers in the glass bangle industry have to work in very high temperature around the glass furnaces. They work in dinky cells without air and light. They don't get any daylight. Thus they lose the brightness of their eyes. The Powder from the polishing of bangles also blinds them.

In Firozabad about 20,000 children have to work in glass bangle industry in dark places all day long.