SELECT * FROM question_mgmt as q WHERE id=210 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=44 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Predict the formula of the stable binary compounds that would be formed by the combination of the following pairs of elements. (a) Lithium and oxygen
(b) Magnesium and nitrogen
(c) Aluminium and iodine
(d) Silicon and oxygen
(e) Phosphorus and fluorine
(f) Element 71 and fluorine

Answer:

CHEMICAL FORMULA- a brief representation of the molecule of a substance (element or compound) in terms of the symbols of the various elements present in it is called its chemical formula.

(a) LiO2   (Lithium dioxide)

(b) Mg3N2 (Magnesium nitrite)

(c) AlI3 (Aluminium triiodide)

(d) SiO2 (Silicon dioxide)

(e) PF3 or PF5 (Phosphorous trifluoride  or pentafluoride)

(f) The element with the atomic number 71 is Lutetium (Lu). It has valency 3. Hence, the formula of the compound is LuF3.(Lutetium trifluoride).


< Previous Question

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=210 ORDER BY views desc, last_viewed_on desc limit 0,10

  • Popular questions of class 11 Chemistry

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=210 ORDER BY last_viewed_on desc limit 0,10

  • Recently Viewed Questions of Class 11 Chemistry

Comments

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

Comment(s) on this Question


Important links

Quick Links

Resources

Support