भीखूभाई के बारे में 4 वाक्य लिखो -class 4 Hindi Ncert Cbse ​

Answer:

all of them.

Explanation:

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the skeleton that fernman

presented was answer french

Explanation:

i

Answer:

The skeleton that Fernman presented was (a) French

Explanation:

Fernman brought a human skeleton on the stage and said he can prove the gender of the skeleton which he cannot prove ethically. He wanted to prove that the basics are the same. The foundations were laid out according to the blueprint. He provided a comic element by relieving the tension in the stage with his innovative and comic presentation.

Aluminium Hydroxide

Symbol =Al , OH

Valency = +3 , -1

cross the valency , Al =>-1 , OH = +3

=> Al (OH)3

Sodium Chloride

Symbol => Na , Cl

Valency = +1 , -1

cross the valency , Na => -1 , Cl => +1

=> NaCl

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(a) Chemical formula of aluminium hydroxide - [tex]Al(OH)_{3}[/tex]

    Chemical formula of sodium chloride - [tex]NaCl[/tex]

(b) (i) Pervoskite - AbO3

    (ii) Magnesium oxide - MgO

Explanation:

Chemical formula of aluminium hydroxide:

• The atomic mass (Z) of Aluminium is 17.
• The valency of aluminium Is 3 as its electronic configuration is 2,8,3.
• The valency of hydroxide ion is -1, as one oxygen is linked to 1 hydrogen atom.
• By using criss-cross method the formula of aluminium hydroxide will be – [tex]Al(OH)_{3}[/tex]

Chemical formula of sodium chloride:

• The atomic mass (Z) of sodium is 11 and that of chloride is 17.
• The valency of sodium Is 1 as its electronic configuration is 2,8,1. And that of chlorine is -1 as its electronic configuration is 2,8,7 and it needs 1 electron to complete its octet.
• By using criss-cross method, the formula of sodium chloride will be – NaCl.

(b) (i)The name of AbO3 is pervoskite

• Pervoskite has a structure of ABX3.
• X is usually anions, often oxygen and halogens.
• Metallic ions form pervoskite.

(ii)The name of MgO is magnesium oxide.

• The symbol for magnesium is Mg and for oxygen is O.
• The valency of Mg is +2 and that of oxygen is -2.
• The anions are written by adding ide at the end.
• So, the name will be magnesium oxide.

best essay on My Village ,My Trees

Answer:

The village is important because it is the primary sector of agricultural production for our country. The village is the backbone of India’s economy. It also plays a major role in maintaining the ecological balance of the environment. Villages are mostly covered with trees and plants. They are covered with green grasslands. One can see acres of green fields as far as the eyes could see. They provide shelter to many animals.The village life is full of contentment and happiness, as people are not in a hurry like in city life.Village people live a very simple life. Villages are mostly situated far from the hustle and bustle of urban civilization. The beauty of nature can be experienced in a village as it is surrounded by trees, flowers, mountains, streams, and farmlands. There is no pollution in the village and one can feel the freshness in the breeze. The demands of the villagers are not too high but they are still deprived of basic facilities. Clean drinking water, electricity, health center, schools, proper sanitation are a few facilities that are lacking in the villages. Their poverty is always visible in the atmosphere. The Panchayati Raj system still prevails in the village and they monitor all activities. The villagers are usually very superstitious. 

Explanation:

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