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Chromatography: 

Chromatography is an important separation technique used to separate constituent particles of a mixture of substances, to purify the compounds and check the purity of compounds. In this technique on a stationary phase (solid or a liquid) a mixture of substance is applied. The mixture of gas or the pure solvent is allowed to move slowly on the stationary phase. Due to which the components of the mixture start separating from one another. 

Chromatography is of two types namely Adsorption chromatography and Partition chromatography.

Gas is liberated in Dumas method is N₂.

(i) Paper, 

(ii) Fhinlayer, 

(iii) Column

The process of getting crystals when hot saturated solution of a compound is cooled is called crystallization.

Crystallization: 

The difference in the solubilities of an organic compound and that of the impurities present in it, in a suitable solvent, is the basis for this method of separation. A concentrated solution is prepared by dissolving the compound in a suitable solvent; the pure compound crystallizes out on cooling. The dissolved impurities are removed through filtration. The filtrate contains some amount of pure compound too. A compound containing impurities of comparable solubilities are purified by repeated crystallization.

The distillation which is carried out with the help of steam is called steam distillation.

Steam distillation is used to purify the liquids which are steam volatile and water and the liquid are not miscible with each other.

Distillation: 

This method is mainly used for separating liquids with sufficient difference in their boiling points. It can also be used for separating volatile liquids from non-volatile impurities. There are two kinds of distillation methods widely used in the industry for purifying organic compounds. These are:

(a) Fractional distillation: It is the process in which the components of a mixture are separated by heating the chemical mixture. Boiling point plays a vital role in fractional distillation. The component with lower boiling point vaporizes first and then the components with higher boiling points. In this way the components of

(b) Steam distillation: In this method substances which are steam volatile and immiscible with water can be separated. It basically lowers the distillation temperature of the organic compounds which are immiscible with water having a high boiling point.

(c) sucralose

(b) Rs 12,398.40

Let Mrs. Sharma’s monthly salary be Rs x. Then, 15% of x = Rs 4428

\(\Rightarrow\) x = Rs \(\frac{4428\times 100}{15}\) = Rs 29520

\(\therefore\) Total monthly amount invested by Mrs. Sharma = (15% + 18% + 9%) of Rs 29520

= 42% of Rs 29250 = \(\frac{42}{100}\) x 29250

= Rs 12398.40.

(C) Both A and B

The study of various external features of the organism is known as morphology.

Correct option: (D) Protista

All single celled eukaryotes like Chrysophytes (diatoms and desmids), Euglenoids (Euglena), Dinoflagellates and slime moulds are included in Kingdom Protista.

The answer is b, Monera

Sweet Peas : Tendril Climber Clitoria : Twiners

A dwelling place of an animal, plant or other organism, to live and reproduce is called habitat.

Correct answer is (a) October

The stem part of the cactus plant performs photosynthesis

Carrot, beet root : store food in roots. Sugarcane : Stores food in shoot.

SIAL

1. It is the upper layer of the earth. 

2. it is made up of silica and aluminium.

SIMA 

1. It is the lower layer of the earth. 

2. It is made up of magnesium and silica.

The length and breadth of different places is as follows: 

(a) Playground

Length of the playground = 3.5 cm = 3.5 × 8 m = 27 m 

Breadth of the playground = 4 cm = 4 × 8 m = 32 m

(b) Office 

Length of the office = 1.1 cm- 1.1 × 8 m = 8.8 m 

Breadth of the office = 0.8 cm = 0.8 × 8 m = 6.4 m 

(c) Library

 Length of the library = 1.1 cm= 1.1 × 8 m = 8.8 m 

Breadth of the library = 0.8 cm = 0.8 × 8 m = 6.4 m 

(d) Classroom 

Length of the Classroom = 4.35 cm = 4.35 × 8 m = 34.8 m 

Breadth of the Classroom = 2.1 cm = 2.1 × 8 m = 16.2 m 

(e) Tennis 

Court Length of the Tennis Court = 1.7 cm= 1.7 × 8 m = 13.6 m 

Breadth of the Tennis Court = 2.7 cm = 2.7 × 8 m = 21.6 m 

(f) Gym 

Length of the Gym = 1.5 cm= 1.5 × 8 m= 12 m 

Breadth of the Gym = 1.7 cm = 1.7 × 8 m= 13.6 m 

(g) Canteen 

Length of the Canteen =1.5 cm=1.5 × 8m=12 m 

Breadth of the Canteen = 1.75 cm = 1.75 × 8 m = 14 m

A hydrocarbon is a compound which consists of carbon and hydrogen only. It undergoes combustion forming carbon dioxide and water as products.

Given mass of hydrocarbon on combustion = 0.39

Given mass of CO₂ = 1.32g

Given mass of H₂O = 0.27g

Mass of carbon in 0.39g of CO₂ = (12/44) x (1.32) =  0.36g CO₂

Mass of hydrogen in 0.27 g of H₂O= (2/18) x (0.27) = 0.03g H₂O

Percentage of C in hydrocarbon = (0.36/0.39) x (100) = 92.30%

Percentage of H in hydrocarbon= (0.03/0.39) x (100) = 7.69%

Correct option is (c) Technical factors, awakening amongst workers, attitude of the government, cultural and social system.

Correct option is (a) specific job

info is the domain name for information service providers.

(a) (i)-2 (ii)-1 (iii)-4 (iv)-3

2 characters are used for country domain names

Tamil is also used in three country top level Domain names

Domain Name – Meaning

in – India us – United States

fr – France

uk – United Kingdom

ca – Canada

au – Australia

Country domain uses 2-character country abbreviation according to country.

For e.g., google, in – for INDIA, google.us for US. 

Country domain names:

(d)  2 to 63

The entire Domain name may be at most of 253 characters long.

(c) Special symbols are not permitted in Domain names

There are 2 ways of arranging the name space

Answer is (a) I. IV

(c) Inverse domain

(b) Name Server

(c) Resolver

Answer (a) True

1. IPv4 Address and

2. IPv6 Address

Answer is (d) server

Answer is (a) Zone

3 types are available in Relative URL

In domain name, sequence of labels are separated by .(dot)

1. label, domian name

2. Labels

The next level to the root element is the children node of root element.

(b) Internet Service Provider

Label:

It is a string which can have maximum of 63 characters. Each node in that level should have different labels thereby assuring the individuality of the domain name. In other words, Labels are the names given to domains. Domain is a sub tree in domain name space tree structure. The domain can be further divided into sub domains.

Bd is the domain name for Bangladesh

The registered domain names and their are available in WHOIS