CBSE > Class 10 | CBSE Board | Homework Help

Although of no practical value, NaHCO3 may be obtained by the reaction of carbon dioxide with an aqueous solution of sodium hydroxide: CO2 + NaOH → NaHCO.

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NaOH is obtained by electrolysis of *

Posted by Mahika Phartyal Pihu 5 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Rishabh Sharma 5 years, 3 months ago

Mahika if you understood by my point please tell me.

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Rishabh Sharma 5 years, 3 months ago

NaOH is obtained by electrolysis of NaCl and H²O Reaction :- 2NaCl + 2H²0 →elctrolysis→2NaOH + Cl² + H² This process is known as "Chlor Alkali Process"

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Given below certain chemical properties of a substance. Ï) it turns blue litmus to red ïï) it turns red litmus to blue ííí) it react with zinc and gas evolves ÌV) it react with solid sodium carbonate to give brisk effervescence . Which out of the above properties are shown by dilute hydrochloric acid (HCL)?

Posted by Mahika Phartyal Pihu 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Gunjan Gungun 5 years, 3 months ago

i- Dilute Hydrochloride acid turns blue litmus to red as it is acidic in nature.

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ANSWER

Class 10 Write a short note on Tooth decay or dental caries. (2 marks)

Posted by Ramya Murali Bhat 5 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Akshita Akshita 5 years, 3 months ago

Tooth decay simple means that is the distruction of the enemel layer of the teeth

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Gaurav Seth 5 years, 3 months ago

Dental Caries or tooth decay is described as the malfunctioning or damage of teeth due to the acids produced by bacterias.
These acids attack the enamel of the tooth which eventually leads to the development of a hole in a tooth known as the cavity.
This problem is often seen in children, adults, and teenagers. This may lead to infection, serious toothache, or tooth loss as well.

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ANSWER

If An=5n-2 then find S4

Posted by Swati Telang 5 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Aditya Kumar 5 years, 3 months ago

First find A1 Next find A4 Now, we have A=A1, L=A4 and N=4 By putting these values in formula of Sn=n/2 (a+l) we will get S4= 42

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Aditya Kumar 5 years, 3 months ago

S4=42

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ANSWER

a fraction becomes 1 by 3 if 1 is subtracted from both its numerator and denominator if 1 is added to both the numerator and denominator it becomes 1 by 2 find the fraction

Posted by Shweta Zine 5 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Aditya Kumar 5 years, 3 months ago

Let numerator be n, and denominator be d a to q (n-1) /(d-1) =1/3 after solving it we will get 3n-d=2 --------------------(i) now, (n+1) /(d+1) =1/2 after solving it we will get d-2n=1 --------------------(ii) Adding both eqn, we get n=3 By putting value of n =3 in any one eqn we get, d=7 So the fraction, n/d=3/7

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Aditya Kumar 5 years, 3 months ago

Fraction = 3/7

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Is bread an important part of goan life? how do you know this?

Posted by Ankit Sheoran 5 years, 3 months ago

CBSE > Class 10 > English Language and Literature

4 answers

Malaika Sharma 5 years, 3 months ago

Yes,bread is an important part of goan life because a sweet bread bol is an essential part of every marriage,Cakes and bolinhas are must for Christmas as well as other festivals and sandwiches are necessary for daughter's engagement.

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Kotadiya Kalpesh 5 years, 3 months ago

Yes, bread is an important part of Goan life. Bread is essential for every celebration in a Goan house. The Portuguese ruled Goa for centuries and the art of legacy which is granted by them. It is quintessential to have a baker's furnace in the village.

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Ajin Ajin 5 years, 3 months ago

Carbon dioxide is what gives alcoholic beverages such as beer and champagne their characteristic bubbles and is also responsible for rising bread. As yeast begins to metabolize sugars in bread dough, the carbon dioxide gas is trapped within the gluten strands, creating bubbles and causing a leavening action. In beverages, the carbon dioxide is trapped within the liquid by the pressure of the sealed container. When the container is opened, the pressure is released and the carbon dioxide begins to release via a bubble. Alcohol, the other byproduct of yeast fermentation, is also produced during the bread making process but evaporates as the bread bakes. When making alcoholic beverages, yeast is allowed to ferment for a much longer period of time, causing it to produce more alcohol.

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Yogita Ingle 5 years, 3 months ago

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ANSWER

In the given figure, if PQRS is a parallelogram and AB || PS, then prove that OC || SR.

Posted by Ramana Kishore 5 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 3 months ago

To prove - OC║SR

Proof - In ΔOPS and ΔOAB

∠POS = ∠AOB (common in both)

∠OSP = ∠OBA (corresponding angles are equal as PS║AB)

=> ΔOPS ~ ΔOAB [AA criteria]

=> PS/AB = OS/OB ........................(1) (sides in similar triangles are proportional)

In ΔCAB and ΔCRQ

As, QR║AB

=> ∠QCR = ∠ACB (common)

=> ∠CBA = ∠CRQ (corresponding angles are equal)

=> ΔCAB ~ ΔCQR [AA criteria]

=> CR/CB = QR/AB (sides in similar triangles are proportional)

Also, PS = QR [ PQRS is parallelogram]

=> CR/CB = PS/AB ......................(2)

From (1) and (2)

=> OS/OB = CR/CB

=> OB/OS = CB/CR

Subtracting 1 from both sides

So, OB/OS - 1 = CB/CR - 1

=> (OB - OS)/OS = (CB - CR)/CR

=> BS/OS = BR/CR

By converse of Thales Theorem

=> OC║SR . Hence proved .

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ANSWER

What exactly happens when a magnet is brought near an iron bar? How does the iron acquire magnetic properties?

Posted by Pruthviraj Chavan 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

When iron nails are brought near one end of a magnet, the nearer end of piece acquires an opposite polarity by magnetic induction. Since unlike poles attract each other, therefore, iron nails are attracted towards the end of the magnet. Thus, the iron nail first becomes a magnet by induction and then it is attracted.

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Explain why 7×11×13+13 and 7×6×5×4×3×2×1+5 are composite numbers?

Posted by Harman Preet 5 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Sarthak Gupta 5 years, 3 months ago

That is why both no. Are composite

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Sarthak Gupta 5 years, 3 months ago

Numbers are of two types - prime and composite. Prime numbers can be divided by 1 and only itself, whereas composite numbers have factors other than 1 and itself. It can be observed that = = = The given expression has 6 and 13 as its factors other than 1 and number itself. Therefore, it is a composite number. = = = 1009 cannot be factorized further Therefore, the given expression has 5 and 1009 as its factors other than 1 and number itself. Hence, it is a composite number.

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Saleem Shaikh 5 years, 3 months ago

,xdhh

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Yeast is used in making bread and bear in beverage industry.why?

Posted by Rishika Swami 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Ajin Ajin 5 years, 3 months ago

This is the reasonCarbon dioxide is what gives alcoholic beverages such as beer and champagne their characteristic bubbles and is also responsible for rising bread. As yeast begins to metabolize sugars in bread dough, the carbon dioxide gas is trapped within the gluten strands, creating bubbles and causing a leavening action. In beverages, the carbon dioxide is trapped within the liquid by the pressure of the sealed container. When the container is opened, the pressure is released and the carbon dioxide begins to release via a bubble. Alcohol, the other byproduct of yeast fermentation, is also produced during the bread making process but evaporates as the bread bakes. When making alcoholic beverages, yeast is allowed to ferment for a much longer period of time, causing it to produce more alcohol.

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ANSWER

Solution of chapter 1

Posted by Nishant Kumar 5 years, 3 months ago

CBSE > Class 10 > संस्कृत (शेमुषी)

0 answers

ANSWER

Questions

Posted by Nishiak Kumari 5 years, 3 months ago

CBSE > Class 10 > हिंदी ए

0 answers

ANSWER

If the roots of ax² + bx + c are in the ratio m:n ,then a) mna²= ( m+c)² b)mnb²=(m+n)ac c)mnb²=(m+n)²ac d)mnb²=(m-n)²ac

Posted by Bhumika Kanel 5 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Rohit Kumar 5 years, 3 months ago

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Please code bta Dijiye apna apna

Posted by Pankaj Malik 5 years, 3 months ago

CBSE > Class 10 > Other Subjects

2 answers

Ajit Kumar Ajit Kumar 5 years, 3 months ago

802215

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Neha Kakkar ?? 5 years, 3 months ago

Why do you want our referral code??

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ANSWER

The sum of first 25 terms of an AP whose nth term is 2-3n, is

Posted by Soniya Rana 5 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 3 months ago

Put n =1

put n =2

put n =3

So, A.P. become s: -1 , -4 , -7, ........

So, first term =a= -1

Common difference d = -4-(-1)=-7-(-4)= -3

Formula of sum of first n terms :

Put n =25

Hence the sum of first 25 terms of an AP is -925

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ANSWER

Please answer.....?????

Posted by Hitesh Kumar 5 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Tripura * 5 years, 3 months ago

What is your question???????? ??????

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Prathamesh Shevale 5 years, 3 months ago

??? Answered

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Vaishnavi Koppineedi 5 years, 3 months ago

For which question we have to answer

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Khushi Shama 5 years, 3 months ago

what question?

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Riya Philip 5 years, 3 months ago

What to answer??

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ANSWER

Bade bhai sahab chote bhai se kitne darje aage thhe??

Posted by Accidental Genius 5 years, 3 months ago

CBSE > Class 10 > हिंदी ब

4 answers

Accidental Genius 5 years, 3 months ago

बड़े भाई साहब छोटे भाई से कितने दरजे आगे थे? The answer of this question is given 3 in book but what is the actual answer?? I think its 4 darje or class and shyd book m galat diya h kyuki bade bhai 9th class m thhe aur chota bhai 5th class m.. To phir difference 9-5=4 Ans to 4 hona chahiye na To ncert book m 3 kyu h chapter m Plz tell the correct answer..

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Aniket Kumar 5 years, 3 months ago

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Ajin Ajin 5 years, 3 months ago

बड़े भाई साहब छोटे भाई से पाँच साल बड़े थे और वे छोटे भाई से चार दर्जे आगे अर्थात् नौवीं कक्षा में थे और छोटा भाई पाँचवीं कक्षा में था।

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Gaurav Seth 5 years, 3 months ago

उत्तर:- बड़े भाई साहब छोटे भाई से पाँच साल बड़े थे और वे छोटे भाई से चार दर्जे आगे अर्थात् नौवीं कक्षा में थे और छोटा भाई पाँचवीं कक्षा में था।

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कथा लेखन कल्पना के लड्डू या शत्रुओं से सावधान

Posted by Ishita Kaushik 5 years, 3 months ago

CBSE > Class 10 > हिंदी ब

1 answers

Shelly Aggarwal 4 years, 11 months ago

satru se savdhan laghu katha

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ANSWER

There are 25 tickets numbered from 1-25.one ticket is drawn at random .the probability that the no on it is a multiple of 5 and 6 is?

Posted by Shipra Mishra 5 years, 3 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

what is commercial farming ?

Posted by Vish Data 5 years, 3 months ago

CBSE > Class 10 > Social Science

4 answers

Poonam Kumari 5 years, 3 months ago

Commercial farming:- It is the farming method in which plan and livestock production is practiced with the intention of of selling the products on the market

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Vansh Chandok 5 years, 3 months ago

Farming

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Yogita Ingle 5 years, 3 months ago

In commercial farming crops are grown and animals are reared for sale in the market that is for commercial purposes while in subsistence farming crops r grown mainly for the farmers family needs.. in commercial farming the area cultivated and the amount of capital invested is large

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Vaishnavi Koppineedi 5 years, 3 months ago

Commercial farming or Commercial Agriculture - this is farming for a profit. It usually involves farming on a large scale, using few workers but lots of machinery and technology. The produce is sold at market. Commercial farms usually produce one crop, so they are a monoculture .

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ANSWER

Explain the poona pact??plz give the answer of this question if any one knows

Posted by Bhakti J. Neve 5 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Yogita Ingle 5 years, 3 months ago

1) The Poona Pact (of September 1932) gave Depressed Classes (later to be known as Scheduled caste) reserved seats in provincial and central legislative councils.
2) They were to be voted in by the general electorate.
3) The act came into force due to Gandhiji s fast unto death.
4) Ambedkar ultimately accepted Gandhiji s stand.

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Explain the role of BJP in Indian government

Posted by Bhakti J. Neve 5 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Account Deleted 5 years, 3 months ago

It Function is to build a strong & modern India by drawing inspiration from India's ancient culture & values;& Deendayal Upadhyay's ideas of integral humanism & Antyodaya. Hope it will work☝?

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Physical and chemical property of acids and bases

Posted by Shreya The Great ??????? 5 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Sarthak Gupta 5 years, 3 months ago

I want to say i want u to ?????

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Sarthak Gupta 5 years, 3 months ago

Ye cbse vale pagal hai bar bar hataye ja rhe hai

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Vaishnavi Koppineedi 5 years, 3 months ago

Bases turn red litmus paper blue. Acids give off H+ (Hydrogen) ions in water; bases give off OH- (Hydroxide) ions in water. Acids generally taste sour due to the sour H+ ion; bases taste bitter due to the OH- ion; but they may have other tastes depending on the other part of the molecule.

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ANSWER

In which form H+ ions react in water

Posted by Abhishek Singh Gurjar X-B Roll No.-02 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Saurabh ???? 5 years, 3 months ago

Molecular form

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ANSWER

What do you mean by oxidation

Posted by Ajin Ajin 5 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Aditya Raj 5 years, 3 months ago

The addition of oxygen to a substance or removal of hydrogen gas from it, is termed as oxidation

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Hitesh Kumar 5 years, 3 months ago

Addition of oxygen and removal of hydrogen

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Khushi Shama 5 years, 3 months ago

The addition of oxygen and removal of hydrogen in a chemical reaction.

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Manish Saini 5 years, 3 months ago

The addition of oxygen and removal of hydrogen in a chemical reaction

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Parv Jain 5 years, 3 months ago

When oxigen increase in atom Or molecul this called oxidation Or reducing agent

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ANSWER

Money acts as an intermediate in the exchange process explain?

Posted by Manjali Chaturvedi 5 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Vaishnavi Koppineedi 5 years, 3 months ago

By serving as a medium of exchange, money removes the difficulties associated with the Barter System. Money is authorised by the government of the country and nobody can legally refuse it as a medium of exchange for goods or services. Thus, it can be concluded that Money acts as an intermediate in the exchange process

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Why did mahatma Gandhi decided to call of the civil disobedience movement in 1931?

Posted by Mishika Chaudhary 5 years, 3 months ago

CBSE > Class 10 > Social Science

2 answers

Pooja Kirar 5 years, 3 months ago

Gandhi ji wanted to disobey Britishers and he was against of salt law , He started this movement because 11 demands of Gandhiji is not full field and nither decision is taken in the second round table conference.

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Ajin Ajin 5 years, 3 months ago

Gandhi decided to call off the Civil Disobedience Movement in 1931 in the wake of following situation: 1. When Abdul Ghaffar Khan, a devout disciple of Mahatma Gandhi, was arrested in April 1930, angry crowds demonstrated in the streets of Peshawar, facing armored cars and police firing. Many were killed. 2. Industrial workers at Sholapur attacked police posts and government institutions after Gandhi's arrest. The violence threatened to get out of hand. 3. The government brutally repressed by attacking and arresting peaceful satyagrahis and beating women and children. Note: Gandhiji wanted the Civil Disobedience Movement to be non-violent and peaceful. Since the movement turned violent, and many people were killed, Gandhiji called it off.

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in science lab one thing is burner which type of solution burner had filled up

Posted by Nishant . 5 years, 3 months ago

CBSE > Class 10 > Science