Suspension :

Suspension doesn’t mix together entirely, or if they do, the particles may become unmixed and fall to the bottom.

Dispersed particles or solute in suspension are larger than solutes of solution.

The diameter os these particles is of the order 2000A˚ or more.

Example- sand stirred ito water, soot in the air.

Colloids:

The colloids solutions are colloids suspension are intermediate between true solutions and suspensions.

The diameter of the dispersed particles in the solvent of colloid solution ranges from 10A˚ to 2000A˚.

Example: milk, butter.

मिठाईवाला अलग-अलग चीज़ें क्यों बेचता था और वह महीनों बाद क्यों आता था?

Answer:

बच्चे एक चीज़ से ऊब न जाएँ इसलिए मिठाईवाला अलग – अलग चीज़ें बेचता था। बच्चों में उत्सुकता बनाए रखने के लिए वह महीनों, बाद आता था। साथ ही चीज़ें न मिलने से बच्चे रोएँ, ऐसा मिठाई वाला नहीं चाहता था।

The Provisions of Treaty of Vienna of 1815 include:
(i) The Bourbon dynasty was restored to power.
(ii) France lost the territories it had annexed under Napoleon.
(iii) A series of states were set up on the boundaries of France to prevent French expansion in future.
(iv) Belgium was set up in the north and Genoa was added to Piedmont in the south.
(v) Prussia was given important new territories on its western frontiers, while Austria was given control of northern Italy.
(vi) In the east, Russia was given part of Poland while Prussia was given a portion of Saxony.
(vii) Thus, monarchies that had been overthrown by Napoleon were restored and a new conservative order was created in Europe.

Colloid:

Depending upon the size of the solute particles the solutions can be categorised as true solution, suspension and colloids. The type of solution in which the size of the solute particle is in the range of 1 to 100 nm, is called a colloid. A colloid is a heterogeneous system in which one substance is dispersed (dispersed phase or colloidal particles) in another substance which is called dispersion medium.

Observation

(i) At low pressure, the graph is almost straight line which indicates that x/m is directly proportional to the pressure.

x/m ∝ pz

x/m = Kp

where K is constant.

(ii) At high pressure, the graph becomes almost constant which means that x/m becomes independent of pressure. This may be expressed as:

x/m = constant

x/m ∝ p⁰

x/m = K p⁰

(iii) Thus, in the intermediate range of pressure, x/m will depend upon the power of pressure which lies between 0 to l i.e., fractional power of pressure (probable range 0.1 to 0.5).

This may be expressed as

x/m ∝ p^1/n

x/m = Kp^1/n

where n can take any whole number value which depends upon the nature of adsorbate and adsorbent. The above relationship is also called Freundlich’s adsorption isotherm.

CBSE 12th Date Sheet 2021: The Central Board of Secondary Education will announce CBSE class 12 exam dates for the 2021 session in the third week of December 2020. It is expected that the exams will start in the second week of February 2021 and will end in the last week of March 2021. The students will be able to download the CBSE time table for class 12 from the official website cbse.nic.in. We will also update the link here once the date sheet will release. The board exams will be conducted in the first meeting i.e. 10:30 AM. 

The adsorption of the gas depends on the nature of the adsorbent. A gas can be adsorbed on different absorbent surfaces in different amounts. For example, <a href="https://byjus.com/chemistry/hydrogen/" rel="noopener" target="_blank">Hydrogen</a> is weakly adsorbed on the alumina surface whereas it is strongly adsorbed on the nickel surface under certain conditions.

Census method refers to the complete enumeration of a universe. A universe may be a place, a group of people or a specific locality through which we collect the data. Census method is necessary in some cases like population census, Agriculture Census, animal census etc for gaining vast knowledge. But in contrary this & method is not applicable as well as needed to some social problems because it is costly and time consuming. It is difficult to study the whole universe because financially aid requires for it to complete the study. For this purpose we use sampling method to pick up a simple from the whole universe. Census method is perplex and take more time in data collection.
 

Advantages & Disadvantages of Census Method

Following are the advantages and disadvantages of census method of data collection

Advantages of Census Method of Data Collection

Intensive Study

Data collection through census method gives opportunity to the investigator to have an intensive study about a problem study about a problem. The investigator gathers a lot of knowledge through this method.

Higher Degree of Accuracy

In this method there would be higher degree of accuracy in data. No other method is accurate like census method when the universe is small.

Suitable for Heterogeneous Units

This method is also applicable for units having heterogeneity or difference.

Indispensable in Some Cases

In certain cases this method is very important and suitable to be used for data collection. Without this method the study of a universe remains uncompleted.

Disadvantages of Census Method of Data Collection

Inconvenient

This method is inconvenient because it take much time, money and set of industrial organizations.

Possible in Few Cases

This method is possible only in few cases of data collection.

Possible in Limited Circumstances

This method is possible only in limited universe it requires not vast area to study.

Time & Labour Consuming

It is much time and labour consuming. It requires a lot of people to involve in data collection.

More Statistical Errors

Data collected through this method would have more statistical errors.

Census method of data collection is helpful only in an area where inquiry is limited, more time and finance available and data have high degree of accuracy otherwise not.

Anne Sullivan

Anne Sullivan was Keller's teacher, companion and friend for nearly 50 years. Sullivan was born April 14, 1866 in Feeding Hills, Massachusetts, to poor Irish immigrants. At the age of 5, Sullivan contracted trachoma, a contagious conjunctivitis that attacks the eyes, and was left almost entirely blind.

Who are the people in the photograph?
Answer:
A smiling girl, about twelve-year-old and two younger girls, Betty and Dolly holding her hands; the 12-year-old girl was the mother of the poet and the other two her cousins.

When iron is mixed (or alloyed) with carbon chromium and nickel, then stainless steel is obtained. Stainless steel is an alloy of iron.

Cooking utensils, knives, scissors and surgical instruments are made of stainless steel and do not rust at all.

Ans. (i) A woman is sweeping outside the Post office.

(ii) Labourers are making a building.

(iii) People are travelling by car and scooters.

(iv) Children are running.

(v) Barber and shoe-maker are waiting for customers.

(vi) A boy is taking tea for customer.

(vii) A woman is walking towards Post Office.

(viii) Children are playing under the tree.

 "Albert Einstein in School" provides us with a rare insight into the younger years of Einstein. Even as a child Einstein's notions were quite progressive. His miserable years at school revealed how a talented creative mind feels trapped and cloistered in the rigid system of education. The classroom had no place for individual aspirations, brilliance or aptitude. One should try to analyze the given scenario and always ask the question "why". However, these notions of Einstein were not understood by anyone, except his Mathematics teacher. Einstein felt trapped in this situation and hated going to school.  He did not compromise and adjust to the system of education which encouraged learning without understanding. For him, ideas were more important than facts. He was expelled from school for his views which did not match the existing pattern. The reader gets to see a glimmer of the future genius through this biography of Einstein.

रहिमन धागा प्रेम का, मत तोड़ो चटकाय।
टूटे से फिर ना मिले, मिले गाँठ परि जाय॥

प्रेम का बंधन किसी धागे के समान होता है जिसे कभी भी झटके से तोड़ नहीं देना चाहिए बल्कि उसकी हिफाजत करनी चाहिए। क्योंकि जब कोई धागा एक बार टूट जाता है तो फिर उसे जोड़ा नहीं जा सकता। जोड़ने की कोशिश में उस धागे में गाँठ पड़ जाती है। किसी से रिश्ता जब एक बार टूट जाता है तो फिर उस रिश्ते को दोबारा जोड़ा नहीं जा सकता।

रहिमन निज मन की बिथा, मन ही राखो गोय।
सुनि अठिलैहैं लोग सब, बाँटि न लैहै कोय॥

अपने दर्द को दूसरों से छुपा कर ही रखना चाहिए। जब आपका दर्द किसी अन्य को पता चलता है तो लोग उसका मजाक ही उड़ाते हैं। कोई भी आपके दर्द को बाँट नहीं सकता।

एकै साधे सब सधै, सब साधे सब जाय।
रहिमन मूलहिं सींचिबो, फूलै फलै अघाय॥

एक बार में कोई एक कार्य ही करना चाहिए। एक काम के पूरा होने से कई काम अपने आप हो जाते हैं। यदि एक ही साथ आप कई लक्ष्य को प्राप्त करने की कोशिश करेंगे तो कुछ भी हाथ नहीं आता। यह वैसे ही है जैसे जड़ में पानी डालने से ही किसी पौधे में फूल और फल आते हैं।

चित्रकूट में रमि रहे, रहिमन अवध-नरेस।
जा पर बिपदा पड़त है, सो आवत यह देस॥

जब राम को बनवास मिला था तो वे चित्रकूट में रहने गये थे। चित्रकूट घनघोर वन में होने के कारण रहने लायक जगह नहीं थी। ऐसी जगह पर वही रहने जाता है जिस पर कोई भारी विपत्ति आती है।

दीरघ दोहा अरथ के, आखर थोरे आहिं।
ज्यों रहीम नट कुंडली, सिमिटि कूदि चढ़ि जाहिं॥

किसी भी दोहे में कम शब्दों में ही बहुत बड़ा अर्थ छिपा होता है। यह वैसे ही होता है जैसे नट की कुंडली होती है। नट अपनी कुंडली में सिमट कर तरह तरह के विस्मयकारी करतब दिखा देता है।

धनि रहीम जल पंक को लघु जिय पियत अघाय।
उदधि बड़ाई कौन है, जगत पिआसो जाय॥

कीचड़ में पाया जाने वाला थोडा सा पानी ही धन्य है क्योंकि उस पानी से कितने छोटे-छोटे जीवों की प्यास बुझती है। सागर का जल विशाल मात्रा में होते हुए भी व्यर्थ होता है क्योंकि उस जल से किसी की प्यास नहीं बुझती।

नाद रीझि तन देत मृग, नर धन देत समेत।
ते रहीम पशु से अधिक, रीझेहु कछू न देत॥

हिरण किसी के संगीत से खुश होकर अपना शरीर न्योछावर कर देता है। इसी तरह से कुछ लोग दूसरे के प्रेम से खुश होकर अपना सब कुछ दे देते हैं। लेकिन कुछ लोग पशु से भी बदतर होते हैं जो दूसरों से तो बहुत कुछ ले लेते हैं लेकिन बदले में कुछ भी नहीं देते हैं।

बिगरी बात बनै नहीं, लाख करौ किन कोय।
रहिमन फाटे दूध को, मथे न माखन होय॥

कोई बात जब एक बार बिग़ड़ जाती है तो लाख कोशिश के बावजूद उसे ठीक नहीं किया जा सकता। यह वैसे ही है जैसे जब दूध एक बार फट जाये तो फिर उसको मथने से मक्खन नहीं निकलता।

रहिमन देखि बड़ेन को, लघु न दीजिये डारि।
जहाँ काम आवे सुई, कहा करे तरवारि॥

किसी बड़ी चीज को देखकर किसी छोटी चीज की उपेक्षा नहीं करनी चाहिए। क्योंकि जहाँ छोटी चीज की जरूरत होती है वहाँ पर बड़ी चीज बेकार हो जाती है। जैसे जहाँ सुई की जरूरत होती है वहाँ तलवार का कोई काम नहीं होता।

रहिमन निज संपति बिन, कौ न बिपति सहाय।
बिनु पानी ज्यों जलज को, नहिं रवि सके बचाय॥

जब आपके पास धन नहीं होता है तो कोई भी विपत्ति में आपकी सहायता नहीं करता। यह वैसे ही है जैसे यदि तालाब सूख जाता है तो कमल को सूर्य जैसा प्रतापी भी नहीं बचा पाता है।

रहिमन पानी राखिए, बिनु पानी सब सून।
पानी गए न ऊबरै, मोती, मानुष, चून॥

पानी हमेशा अपने पास रखना चाहिए क्योंकि पानी के बगैर जीवन असंभव है। बिना पानी के न तो मोती बनता है, न चूना और पानी के बिना मनुष्य जीवन भी असंभव है।

The common name of CaCl2 is calcium chloride.

It is one of the types of salts used on roads during winter to melt ice.

It is called De-icing salt.

It has a dust suppression property.

The second largest application of calcium chloride exploits hygroscopic properties and the tackiness of its hydrates.

It is A a concentrated solution that keeps a liquid layer on the surface of dirt roads, . which It helps in suppresses suppressing the formation of dust.

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