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Taj Mahal, the great wonder of the world, is made of white marble which is composed of calcium carbonate. About 60 years ago it was discovered that this monument is being eaten away by acid rain. The Archeological survey of India, that looks after this building of historical importance is of the opinion that the atmospheric pollution due to vehicular traffic and industries, mainly Mathura Refinery may be a major cause of acid rain in and around the monument. Normal rain is slightly acidic because it absorbs some CO, from the atmospheric air. Acid rain is more acidic than normal rain because it also has absorbed oxides of nitrogen and sulphur. (a) What happens when marble is heated? Write the chemical reaction. What type of reaction is it. Name the product formed in this reaction which is used in the manufacture of cement. How will you test the gas evolved in this reaction. (b) Write down observations which help us to determine whether a chemical reaction has taken place or not. Or (b) A solution of a substance "X" is used for white washing. () Name the substance X and write its formula. (i) Write the reaction of substance X with water.

Posted by Sonali Negi 2 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Omya Aryan 2 years, 11 months ago

(a) When marble(CaCO3) is heated, it decomposes into Quick lime(CaO) and Carbon dioxide(CO2). (b) •Change in temperature •Change in colour • Change in state •Evolution of gas. OR (b) Calcium Oxide (CaO) is used for white washing. (i) CaO+H2O -------› Ca(OH)2

ANSWER

Bengali PVYQ

Posted by Rupanta Saha 2 years, 11 months ago

CBSE > Class 10 > Regional Language

0 answers

ANSWER

The 8th term of an AP is zero. Then find its 38th term?

Posted by Rajat Kumar 2 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Saksham Bhardwaj 2 years, 11 months ago

30d, where d is common difference

Rajat Kumar 2 years, 11 months ago

Yes

Raksha Trivedi 2 years, 11 months ago

Is this que complete?

ANSWER

Find the sum of ap 7 10.5 14.........84

Posted by Ali Ahamad Khan 2 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Krish Raj 2 years, 11 months ago

1001

Arpit Singh 2 years, 11 months ago

Sn=n/2(a+l) where a=first term & l=last term then put the value in formula

K. Hema 2 years, 11 months ago

The sum of the first n terms of an Arithmetic Progression is given by Sₙ = n/2 [2a + (n - 1) d] or Sₙ = n/2 [a + l], and the nth term of an AP is aₙ = a + (n - 1)d Here, a is the first term, d is the common difference and n is the number of terms and l is the last term. (i) 7 + 10 ½ + 14 + .... + 84 Given, First-term, a = 7Common Difference, d = 10 ½ - 7 = 21/2 - 7 = 7/2Last term, l = 84 To find the total number of terms, we will use the formula a + (n - 1) d. l = aₙ = a + (n - 1) d 84 = 7 + (n - 1) 7/2 77 = (n - 1) 7/2 22 = n - 1 n = 23 Hence, n = 23 Sₙ = n/2 [a + l] S₂₃ = 23/2 [7 + 84] = (23/2) × 91 = 2093/2 = 1046 ½

ANSWER

Can anyone post chennai sahodaya science pre board question paper?

Posted by Mourya Selvaraj 2 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is the significance of goal seek feature in a spreadsheet ? Explain with example .

Posted by Bushra Aquil 2 years, 11 months ago

CBSE > Class 10 > Information Technology (402)

2 answers

Shorya Varshney 2 years, 11 months ago

What is goal seek

Anash Saify 2 years, 11 months ago

You can use Goal Seek to determine what interest rate you will need to secure in order to meet your loan goal

ANSWER

Write any four advantages of macro?

Posted by Bushra Aquil 2 years, 11 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

Omya Aryan 2 years, 11 months ago

Advantages of Macro are as follows… •It save ones time. •Facilitates the effective functioning of spreadsheet. • One need not have to learn the steps of any process. • Creating a shortcut key etc.

ANSWER

Papree

Posted by Abhi Abhi 2 years, 11 months ago

CBSE > Class 10 > गणित

0 answers

ANSWER

Pal

Posted by Abhi Abhi 2 years, 11 months ago

CBSE > Class 10 > गणित

0 answers

ANSWER

Prove that 1/ root 2 is irrational

Posted by Shanmuga Lakshmi 2 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

K. Hema 2 years, 11 months ago

Rationalize factor =root 2 =1/root 2×root 2/root 2 =Root 2/2 =root 2/2 is a rational number. Let us assume that root 2/2 is a rational number. root 2/2=p/q, q is not equal to 0 Where p and q are co-prime number. root 2/2=p/q Root 2=p/q×2 Multiplication of two rational number is a rational number. Thus root 2 is a rational number. But this contradicts the fact that root 2 is a irrational number. This contradiction arises because of our incorrect assumptions that 1/root 2 is a rational number. Hence 1/root 2 is a irrational number.

ANSWER

In an experiment with a rectangular glass slab a student observed that a ray of light incident at an angle of 55° with the normal on one face of the slab , after refraction strikes the opposite face of the slab before emerging out into air making an angle 40° with normal.Draw a labelled diagram to the angle of refraction and angle of emergence

Posted by Muskan Dhiman 2 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Explain with the help of a ray diagram why a pencil partially emerged in water appears to be bent at water surface

Posted by Muskan Dhiman 2 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Omya Aryan 2 years, 11 months ago

It is due to a phenomenon called refraction. Light rays are unable to travel faster in water as compared to the air.

ANSWER

Tantheta/1-cottheta + cottheta/1-tantheta = 1 + secthetacosectheta

Posted by Swapnil Kamble 2 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Puja Rani 2 years, 11 months ago

LHS- tan A 1- cot A 1- tan A so A tan A(tan A-1) (tan A-1) (tan2 A+tan A+1) tan A(tan A-1) + + + + cot A 1 tan A 1- tan A 1 tan A(1- tan A) 1 1-. 1 tan A tan A tan A-1 tan A tan2 A tan A-1 tan A(1- tan A) tan³ A-1 tan² A+tan A+1 tan A =tan A+ 1+ cot A sin A cos A cos A + +1 sin A sin² A+cos² A sin A cos A 1 +1 +1 sin A cos A = sec A cosec A+ 1 =RHS [a3- b3- (a- b) (a2+ab+b²)]

ANSWER

The near point of a hypermetropic eye is 50 can what is the nature and power of the lens required to enable him to read a book placed at 25cm from the eye

Posted by Tilak Gautam Gautam 2 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Aastha Vats 2 years, 11 months ago

Convex lens , 2 dipometre

ANSWER

Write the essay to internet

Posted by Nitish Kumar 2 years, 10 months ago

CBSE > Class 10 > English Language and Literature

1 answers

Preeti Dabral 2 years, 10 months ago

The internet is an invention of high-end science and modern technology. Apart from that, we are connected to internet 24×7. Also, we can send big and small messages and information faster than ever. In this essay on the Internet, we are going to discuss various things related to the internet Reach of Internet It is very difficult to estimate the area that the internet cover. Also, every second million people remain connected to it with any problem or issue. Apart from that, just like all the things the internet also has some good and bad effect on the life of people. So the first thing which we have to do is learn about the good and bad effect of the internet. Good effects of the internet mean all those things that the internet make possible. Also, these things make our life easier and safer. Bad effects of the internet mean all those things that we can no longer do because of the internet. Also, these things cause trouble for oneself and others too. You can access in any corner of the world. Also, it is very easy to use and manage. In today’s world, we cannot imagine our life without it. Uses Of Internet: From the time it first came into existence until now the internet has completed a long journey. Also, during this journey, the internet has adopted many things and became more user-friendly and interactive. Besides, every big and small things are available on internet and article or material that you require can be obtainable from internet Tim Berners-Lee can be called one of the main father of internet as he invented/discovered the WWW (World Wide Web) which is used on every website. Also, there are millions of pages and website on the internet that it will take you years to go through all of them. The Internet can be used to do different things like you can learn, teach, research, write, share, receive, e-mail, explore, and surf the

ANSWER

Internet

Posted by Nitish Kumar 2 years, 10 months ago

CBSE > Class 10 > English Language and Literature

1 answers

Preeti Dabral 2 years, 10 months ago

The Internet is a vast network that connects computers all over the world.

ANSWER

What is blood pressure ?

Posted by Aryan Khan 2 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Kriti Mallah 2 years, 11 months ago

A condition in which the force of the blood against the artery walls is too high.

Aastha Vats 2 years, 11 months ago

The force that blood exerts against the wall of a vessel is called blood pressure.

ANSWER

How does the character of lencho inspire us

Posted by Toxic Slitz 2 years, 11 months ago

CBSE > Class 10 > English Language and Literature

2 answers

Pragati Keshri 2 years, 11 months ago

The lencho has faith in god. When his crops destroyed due to hailstorm he thought that god will help us so he writes a letter to god and send through mail

Aastha Vats 2 years, 11 months ago

The character of lencho inspire us to have firm faith in god and to remain clam in most difficult situations of life.

ANSWER

(Cotx-cosecx)²

Posted by Ishan Srivastava 2 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Aastha Vats 2 years, 11 months ago

Cotx^2 + cosecx^2 - 2cotx cosecx

ANSWER

How is that the average person in haryana has more income than the average person in Kerala but lags behind in crucial private facilities?

Posted by Rupa Chakrabarty 2 years, 11 months ago

CBSE > Class 10 > Social Science

1 answers

Omya Aryan 2 years, 11 months ago

Kerala has better private facilities in compared to Haryana. Haryana lacks behind the infant mortality rate, net attendance ratio, *** ratio (women), health care centers, educational institutions etc.

ANSWER

What are the benefits of using graphical object in a writer document

Posted by Kranthi Kumar Jalla 2 years, 11 months ago

CBSE > Class 10 > Information Technology (402)

2 answers

Kaushiki Priya 2 years, 11 months ago

Thanks

Omya Aryan 2 years, 11 months ago

Benifits of using graphical objects in a writer are as follows... •It puts a good impression on the audience. • Easy to understand the massage. • Effective functioning of visual communications etc.

ANSWER

What hope for lencho

Posted by Neetesh Shukla Neetesh. Shukla 2 years, 11 months ago

CBSE > Class 10 > English Language and Literature

3 answers

Manika Sharma 2 years, 11 months ago

His only hope was the help from God

Pragati Keshri 2 years, 11 months ago

Lencho hope for warm rain

Chanchal Dhakad 2 years, 11 months ago

Hope for lencho was to have a good rain to have a good harevst

ANSWER

325 can be expressed as a product of it's primes as :

Posted by Divyanshu Kumar 2 years, 11 months ago

CBSE > Class 10 > Mathematics

4 answers

Ambika Venkat 2 years, 11 months ago

5×5×13

Rithika S 2 years, 11 months ago

(5×5×13) =325 Where all numbers (13, 5) are prime numbers

Rajat Kumar 2 years, 11 months ago

325=5 x 5 x 13 where all are prime numbers

Divyanshu Kumar 2 years, 11 months ago

325 = 5x5x13 = 5^5x13

ANSWER

cyber beans kips learing project in html project 2 fig 3 source code i need

Posted by Sachin Bhati 2 years, 11 months ago

CBSE > Class 10 > Information Technology (402)

0 answers

ANSWER

What is stress management

Posted by Aditi Nagarkar 2 years, 11 months ago

CBSE > Class 10 > Artificial Intelligence (417)

5 answers

Parth Kalra 2 years, 11 months ago

A ability to manage your stress

Kashish Kashish 2 years, 11 months ago

Yoga , vacation,physical exercise

Praveena Sri 2 years, 11 months ago

Stress management offers a range of strategies to help you better deal with stress and difficulty (adversity) in your life.

Aashi Bhardwaj 2 years, 11 months ago

Stress Management is about making a plan to be able to cope effectively with daily pressures.

Adarsh Kumar Patel 2 years, 11 months ago

Adarsh Singh

ANSWER

"As the blood sugar level in our body falls insulin secretion is reduced. " Justify this statement in the reference of feedback mechanism that regulates the timing and amount of hormone released.

Posted by Sharma Sharma 2 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Kriti Mallah 2 years, 11 months ago

Insulin balance the sugar label in our body

ANSWER

Two circular cylinders of equal volume have their heights in the ratio 1:2 . The ratio of their radii is

Posted by Sharma Sharma 2 years, 11 months ago

CBSE > Class 10 > Mathematics

2 answers

Lakshaya Swarnareka 2 years, 11 months ago

Let r1 and h1 be the radius and height of the first cylinder, then Volume = πr21h1 Similarly r2 and h2 are the radius and height of the second cylinder ∴Volume=πr2h2 But their volumes are equal, ∴πr21h1=πr22h2 =r21r22=h2h1 ⇒h2h1=r22r21 But h1h2=12 ∴r22r21=12⇒r21=2r22 ∴r21r21=21⇒r1r2=√21 ∴ Ration in radii = √2 : 1 Hence the correct answer is √2 : 1

Aastha Vats 2 years, 11 months ago

Let the height be h and 2h and radii be r and R. 22/7 × r^2 × h = 22/7 × R^2 × 2h r^2 × h = R^2 × 2h r^2/R^2 = 2h / h r^2 / R^2 = 2/1 r/R = root 2 / 1 r:R = root 2 : 1

ANSWER

If tanA =√2-1, show that sinA*cosA=√3/4

Posted by Sharma Sharma 2 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Vivek Prajapati 2 years, 11 months ago

Hlo sach mein nahi aata ki bas enjoy ke liye send Kari ho

ANSWER

What are the advantages of solenoid

Posted by Mriganko Biswas 2 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Devraj Sharma 2 years, 11 months ago

A solenoid behave like a bar magnet

Soham Singh 2 years, 11 months ago

Solenoid is a magnet that can be switched off and on. We can also change the strength of magnetic field by the increasing or decreasing of current

Diva Sand 2 years, 11 months ago

Solenoid act as as a bar magnet It can even form an electromagnetic material

ANSWER

A man can raw 8km upstream and 24 km downstream in 4 hr . It can raw 12 km upstream and 12 km downstream in 4 hr find the speed of the man in still water and find the speed of current

Posted by Sridhar D M 2 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Rohit Kumar 2 years, 11 months ago

20

ANSWER

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