⇦ | ⇨ |
One litre hard water contains 12 mg Mg²⁺. Milli equivalents of washing soda required to remove its hardness is
Options
(a) 1
(b) 12.16
(c) 1 x 10⁻³
(d) 12.16 x 10⁻³
Correct Answer:
1
Explanation:
Equivalent weight of Mg2+ = molecular weight/ charge on ion
= 24/2 =12
Equivalent weight of Na2CO3 = Molecular Weight/ total charge =106/2 = 53
Weight of Mg2+ = 12mg =12/1000 gm
Let assume that Net weight of Na2CO3 required = w2
no.of equivalents of Mg2+ = no. of equivalent of Na2CO3 required
12/1000 * 12 = w2/53
w2 = 53/1000 gm
so milli equivalent of Na2CO3 required = (w2/E2) x 1000 = 1
Related Questions: - If a given sample of water contains 0.06 g of Ca²⁺ ion per kg, calculate
- Which one of the following contain isopropyl group
- When phenol reacts with phthalic anhydride in presence of H₂SO₄ and heated
- To which of the followings the Dalton’s law of partial pressure is not applicable
- When 10 g of a non-volatile solute is dissolved in 100 g of benzene ,
Question Type: Apply
(15)
Difficulty Level: Easy
(1008)
Topics: Basic Concepts of Chemistry
(94)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If a given sample of water contains 0.06 g of Ca²⁺ ion per kg, calculate
- Which one of the following contain isopropyl group
- When phenol reacts with phthalic anhydride in presence of H₂SO₄ and heated
- To which of the followings the Dalton’s law of partial pressure is not applicable
- When 10 g of a non-volatile solute is dissolved in 100 g of benzene ,
Question Type: Apply (15)
Difficulty Level: Easy (1008)
Topics: Basic Concepts of Chemistry (94)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply