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jayashimman from sboa, Chennai
Subject :NSO    Class : Class 9

Ans 1:

Pulkit from Aryaman Vikram Birla- Institute of Learning, Haldwani
Class : Class 9
permanent hardness of water means it cannot be converted again into its soft state without strong boiling as it contains Ca and Mg salts..

Ans 2:

Sarthak Praveen Modhe from St. Thomas Convent Sr. Sec. School, Bhopal
Class : Class 9
as hard water contains dissolved magnesium and calcium ions

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abhinav from fitjee world school, Hyderabad
Subject :NSO    Class : Class 6

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Ritesh N Das from Adamas International School, Kolkata
Subject :NSO    Class : Class 6

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hanish gowda from vidyaniketan public school, Bengaluru
Subject :NSO    Class : Class 7

Ans 1:

Nageswara Rao Rayala from new vison olmpiyad school, khammam,telangana
Class : Class 7
hno3=nitricacid or aquafortis,h2so4=sulphuric acid or oil of vitriol or king of chemical compounds

Ans 2:

nasr2607@gmail.com from Aurum the Global School, Haldwani
Class : Class 8
HNO3 - NITRIC ACID , H2SO4 - SULPHURIC ACID

Ans 3:

Tejas Shende from Kendriya Vidyalaya, IIT Campus, Powai, Mumbai, Mumbai
Class : Class 8
HNO3 and H2SO4 are strong and artificially made acids called as Nitric acid and Sulphuric acid respectively. They are used in perfume making, cleansing of metal containers, etc. and they are also used in chemical reactions.

Ans 4:

Pranav from Sri Aurobindo Memorial school, Bengaluru
Class : Class 9
HNO3=nitric acid H2SO4=sulphuric acid

Ans 5:

Pulkit mittal from GAIL DAV PUBLIC SCHOOL, AURAIYA
Class : Class 9
hno3 i snitric acid a very strong acid indeed a monobasic acid h2so4 is sulphuric acid ph is 1.4 highly corrosive used in lead storage batteries hope u get

Ans 6:

Swetanshu Sekhar Pati from Amity International School, Noida
Class : Class 9
HNO3 = Nitric Acid H2SO4 = Sulphuric acid

Ans 7:

Kriti Kannan from Kendriya Vidyalaya Janakpuri, New Delhi
Class : Class 9
HNO3 = NITRIC ACID H2SO4 = SULFURIC ACID

Ans 8:

Siddhant Shaurya Goyal from DPS Durg, Chattisgarh
Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

Ans 9:

Manas Malla from Visakha Valley School, Visakhapatnam
Class : Class 8
HNO3 is Nitric Acid H2SO4 is Sulphuric Acid

Ans 10:

Siddhant Shaurya Goyal from DPS Durg, Chattisgarh
Class : Class 7
HNO3 - NITRIC ACID H2S04- SULPHURIC ACID

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Krithik from St Gregorios HIgh School, Mumbai
Subject :NSO    Class : Class 3

Ans 1:

Shagun from MAXFORT DWARKA, New Delhi
Class : Class 5
Telephone

Ans 2:

Shagun from MAXFORT DWARKA, New Delhi
Class : Class 5
telephone

Ans 3:

Adithya Bharath M from Manipal School, Mangalore
Class : Class 5
E-mail

Ans 4:

Kirti Dwivedi from DR AMIN, Vadodara
Class : Class 5
A

Ans 5:

suchir from dehli public school miyapur, Hyderabad
Class : Class 6
E-mail

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abhinav from fitjee world school, Hyderabad
Subject :NSO    Class : Class 6

Ans 1:

Ritesh N Das from Adamas International School, Kolkata
Class : Class 8
disulfuric acid

Ans 2:

abhinav from fitjee world school, Hyderabad
Class : Class 8
oleum=h2s2o7 or disulphuric acid or fuming sulphuric acid

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Pulkit from SFS ICSE, Bangalore
Subject :NSO    Class : Class 6

Ans 1:

A Andriya from Lalaji Memorial Omega International School, Chennai
Class : Class 7
The Juno mission to planet Jupiter .

Ans 2:

abhinav from fitjee world school, Hyderabad
Class : Class 8
JUNO mission to jupiter

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UVAIS ZUFAR from DON BOSCO SCHOOL OF EXCELLENCE, Chennai
Subject :NSO    Class : Class 5

Ans 1:

Soundharya from ISWK, Muscat
Class : Class 8
Trible people live in forests. Deforestation is the process of cutting down of trees in forests. This affects the survival of trible people as they get food from these trees and live in forests.

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Nishat Anjum from Sarala Birla Public School, Ranchi
Subject :NSO    Class : Class 3

Ans 1:

Adithya Bharath M from Manipal School, Mangalore
Class : Class 5
The Pole star

Ans 2:

Shubhra from Sandipani, Nagpur
Class : Class 3
Sun

Ans 3:

Kirti Dwivedi from DR AMIN, Vadodara
Class : Class 5
Sun

Ans 4:

Nishat Anjum from Sarala Birla Public School, Ranchi
Class : Class 4
U Y Scoti

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nasr2607@gmail.com from Aurum the Global School, Haldwani
Subject :NSO    Class : Class 7

Ans 1:

Sanchay from BIS Dwarka, Dwarka
Class : Class 8
Theory of Relativity is a theory proposed by Albert Einstein relating mass, capacity and energy in the form of equation where E is energy, M is mass and C is capacity (E=MC^2).

Ans 2:

Ananya from Delhi Public School, Meerut
Class : Class 7
The theory of relativity was proposed by Albert Einstein and determined that the laws of physics are the same for all non accelerating observers. He showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels.

Ans 3:

Gyanajyoti Mishra from J.N.V., Jajpur
Class : Class 9
Theory of relativity says us that E means energy and M where mass and C means velocity of light, in the equation E=MC^2

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