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Shweta Basu from Amity international School, Gurgaon
Subject :NSO    Class : Class 9
Permanent hardness of water may be removed by the addition of ____.

Ans 1:

abhinav from st. mary's school, dwarka, New Delhi
Class : Class 9
hydrogen and oxygen.

Ans 2:

Sarthak Praveen Modhe from St. Thomas Convent Sr. Sec. School, Bhopal
Class : Class 9
yes it is hydrogen and oxygen

Ans 3:

Namanjain5589@Gmail.com from Yugantar Public School , Rajnandgaon
Class : Class 9
Hydrogen and Oxygen H2O

Ans 4:

Anu Sharma from DPS Noida, Noida
Class : Class 2
Sodium Carbonate

Ans 5:

Anu Sharma from DPS Noida, Noida
Class : Class 2
hydrogen and oxygen

Ans 6:

Nimesh from Dhanbad public school Hirak Branch, Dhanbad
Class : Class 10
Hydrogen & Oxygen

Ans 7:

keerthana from kakatiya high school, suryapet
Class : Class 9
Hydrogen,oxygen

Ans 8:

Gh from Mahatma, Ghaziabad
Class : Class 10
Sodium carbonate probably

Ans 9:

Vipup Sharma from HAPPY HOME PUBLIC SCHOOL SECTOR 11 ROHINI, New Delhi
Class : Class 10
HYDROGEN AND OXYGEN

Ans 10:

Wyesvatha.J from Geethaanjali All India Senior Secondary School, Erode
Class : Class 10
sodium carbonate

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