Q&A -Ask Doubts and Get Answers
Previous NextMetals and Non-metals
Question:
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
(a) calcium
(b) carbon
(c) silicon
(d) iron
Answer:
An ionic compound is a compound in which the cation and anion are held together by strong inter-ionic attraction while the covalent compound is the compound which is formed by the sharing of electrons between atoms. The ionic compounds have high melting and boiling point and are highly soluble in water while covalent compounds have low melting and boiling point and are insoluble in water.
The oxides of group I and II elements are ionic and have a high melting point and boiling point than the oxide of non-metals and transition metals. The calcium belongs to group II, also called alkaline earth metal group. The calcium oxide has a high melting point and is soluble in water. Ferric oxide is also ionic but it has less melting point than calcium oxide. Carbon and silicon are non-metals and they form a covalent oxide, that has the lowest melting point.
Therefore, the correct answer is (a) calcium
Related Questions for Study
Quick Buy
LATEST OFFERS & PROMOTIONS
What our students and parents say about us!
Saiyam is using EduSaksham online courses from past one year. He is able to complete his tutorials, worksheets, and assignments on his own. Once he is done with worksheets, he can check his answers and if he has done any mistakes, then he can check the correct answers and explanations. They have been given so well that he is able to understand them himself and rarely he asks us for any clarification. He enjoys using the platform and has learned and improved a lot in Mathematics. I would recommend EduSaksham to all parents who want their kids to learn in a structured way and also enjoy the learning process.
Neeraj (Saiyam's Father)
I would like to thank Edusaksham on behalf of my son Aditya who attended " Math Olympiad crash course for 5 weeks". As per Aditya, this course helped him to understand new topics like Roman numerals and decimal places which were not taught in his school till date and had a better understanding of other topics. I personally thank EduSaksham for all the help and support.
Geeta Bansal (Aditya's Mother)
We had a good experience with EduSaksham. Because sheets are available online, Vedant enjoyed doing more and more sheets without any reminders. I could leave him on his own as he was very much motivated to cover the topics. Practice is very important in maths but it becomes difficult for us to prepare sheets, I am glad we found EduSaksham where in a lot of in a lot of sheets are available for practice and the quality of questions are also good. As it's a venture from IITians we could think of giving it a try and I am glad we tried
Shikha Chowdhary (Vedant's Mother)
I have grown up in a family where my father used to give me practice maths paper every day which I need to finish before I go to play. I think that strong foundation of solving new questions every day helped me to clear my IITJEE exam. But as working women, I always had time challenge to create practice Math papers for my daughter. Thanks to EduSaksham, their questions are so logical and conceptual that I don't feel the guilt of not creating practice questions by myself :). There are plenty of worksheet along with the tutorials for each chapter. It has made parents life easier :) And the best part is my daughter loves doing it. Thank you EduSaksham.
Anupma (Akshainie's mother)
Choose EduSakshamยฎ
Embrace Better Learning
