Question
[47]. Which salt is used to remove permanent hardness of water in a common laboratory test? / जल की स्थायी कठोरता दूर करने के लिए प्रयोगशाला परीक्षण में सामान्यतः कौन-सा लवण प्रयोग किया जाता है?
Option 4 : Washing soda (sodium carbonate)
Detailed Solution
सही उत्तर Washing soda (sodium carbonate) है।
Washing soda precipitates calcium and magnesium ions.
- ->SSC CGL Admit Card 2026Download Tier — 1 Hall Ticket Region — wise, Exam Day Rules
- ->SSC CGL Exam Date 2026Tier — 1 Schedule (30 Sep–30 Oct), Shifts, City Slip & Admit Card Dates
- ->SSC CGL Exam Date 2026Tier — 1 Schedule (30 Sep–30 Oct), Shifts, City Slip & Admit Card Dates
- ->SSC CGL 2026 Notification Out10,731 Vacancies, Apply Online, Exam Dates, Eligibility
- ->SSC GD Physical Test 2026PET/PST Running, Height, Chest Standards, Dates
- ->SSC GD Constable Cut Off 2026 OutState — wise, Category — wise Cut Off Marks (Male/Female)
- ->SSC GD Constable Result 2026 Out1,97,408 Candidates Shortlisted for PET/PST — Check Merit List PDF
- ->RRB NTPC Cut Off 2026Expected CBT — 1 Cut Off, Previous Year Cut Offs (Zone — wise)
Recommended Test Series
Attempt full-length mock tests, sectional papers & All India Rank
AIIMS CRE Social Security Officer, Manager Grade-II & Superintendent Test Series 2026
AIIMS CRE Social Security Officer, Manager Grade-II & Superintendent Test Series 2026
20 Total Tests
- •20 Full Test (Prelims)
SSC GD Constable Test Series
SSC GD Constable Test Series
145 Total Tests
- •15 Full Test (Prelims)
- •50 Sectional Test
- •55 Chapter Test
- +25 more tests
DSSSB Junior Scientific Assistant (LieDetection) Test Series 2026 | 25+ Mock Tests
DSSSB Junior Scientific Assistant (LieDetection) Test Series 2026 | 25+ Mock Tests
120 Total Tests
- •20 Full Test (Prelims)
- •100 Sectional Test
AIIMS CRE Assistant Security Officer Test Series 2026
AIIMS CRE Assistant Security Officer Test Series 2026
70 Total Tests
- •20 Full Test (Prelims)
- •50 Sectional Test
More Mock Test Questions
[1]. Passage: Systems that remember everything a person has said, searched, or photographed raise a question older than computing: who owns ...
[2]. Passage: Systems that remember everything a person has said, searched, or photographed raise a question older than computing: who owns ...
[3]. Passage: Systems that remember everything a person has said, searched, or photographed raise a question older than computing: who owns ...
[4]. Passage: Systems that remember everything a person has said, searched, or photographed raise a question older than computing: who owns ...
[5]. Passage: Systems that remember everything a person has said, searched, or photographed raise a question older than computing: who owns ...
[6]. Fill in the blank with the correct idiom: After the audit revealed gaps, the officer decided to ___ and accept responsibility instead o...
[7]. Choose the correct form: Neither the teachers nor the headmaster ___ satisfied with the timetable, though it ___ revised twice.
[8]. Choose the correct preposition: She is good ___ mathematics but weak ___ expressing her ideas in writing.
prepsnap.in • Mock TestQuestion:
[47]. Which salt is used to remove permanent hardness of water in a common laboratory test? / जल की स्थायी कठोरता दूर करने के लिए प्रयोगशाला परीक्षण में सामान्यतः कौन-सा लवण प्रयोग किया जाता है?
Correct Answer: Washing soda (sodium carbonate)
Washing soda precipitates calcium and magnesium ions.