Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.1. Calcium Sulphate2. Sodium Sulphate3. Calcium Chloride4. Potassium Sulphate5. Sodium Hydrogen Carbonate6. Magnesium Chloride(a) 1, 2 and 4 (b) 1, 3 and 6 (c) 3, 5 and 6 (d) 2, 4 and 5
Correct Answer: (b) 1, 3 and 6
Explanation: Hard water contains Ca2+ and Mg2+ ions. Thus the salts which can be added to water to make it hard are calcium sulphate, calcium chloride and magnesium chloride i.e., the salts 1, 3 and 6.
Related Articles
- A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory, there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard.(A) Sodium chloride, Potassium chloride(B) Sodium sulphate, Potassium sulphate(C) Sodium sulphate, Calcium sulphate(D) Calcium sulphate, Calcium chloride
- In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following group of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard:Sodium chloride, calcium chloridePotassium chloride, sodium chlorideSodium chloride, magnesium chlorideCalcium chloride, magnesium chloride
- What is the chemical formula of the following:-1. Magnesium chloride.2. Calcium oxide.3. Copper nitrate.4. Aluminium chloride.5. Calcium carbonate.
- Following data gives the number of children in 41 families:$1, 2, 6, 5, 1, 5, 1, 3, 2, 6, 2, 3, 4, 2, 0, 0, 4, 4, 3, 2, 2, 0, 0, 1, 2, 2, 4, 3, 2, 1, 0, 5, 1, 2, 4, 3, 4, 1, 6, 2, 2.$Represent it in the form of a frequency distribution.
- The following are the margins of victory in the matches of a football league : 3, 2, 1, 5, 6, 4, 2, 1, 3, 1, 2, 1, 4, 2, 5, 5, 6, 2, 3, 2 Find the mean of the data.
- Convert the following ratios to percentage: $( a).\ 3:1,\ ( b).\ 2:3:5,\ ( c).\ 1:4,\ ( d).\ 1:2:5$.
- Co-ordinates of the point P dividing the line segment joining the points A(1, 3) and B(4, 6), in the ratio 2:1 are:$( A) \ ( 2,4)$ $( B) \ ( 3,\ 5)$ $( C) \ ( 4,\ 2)$ $( D) \ ( 5,\ 3)$
- Name the property used in the following:$[\frac{2}{3}+(\frac{-4}{5})]+\frac{1}{6}=\frac{2}{3}+[(\frac{-4}{5})+\frac{1}{6}]$
- Which of the following mixture can be separated completely by the process of sublimation ?(1) fine sand and cane sugar(2) sodium chloride and potassium permanganate(3) potassium chloride and ammonium chloride(4) barium chloride and sodium sulphate
- Name the type of quadrilateral formed, if any, by the following points, and give reasons for your answer.(i) $(-1, -2), (1, 0), (-1, 2), (-3, 0)$(ii) $(-3, 5), (3, 1), (0, 3), (-1, -4)$(iii) $(4, 5), (7, 6), (4, 3), (1, 2)$
- Classify the following salts into acidic, basic and neutral:Ammonium chloride, Sodium carbonate, Sodium chloride, Potassium sulphate.
- Observe the following pattern\( (1 \times 2)+(2 \times 3)=\frac{2 \times 3 \times 4}{3} \)\( (1 \times 2)+(2 \times 3)+(3 \times 4)=\frac{3 \times 4 \times 5}{3} \)\( (1 \times 2)+(2 \times 3)+(3 \times 4)+(4 \times 5)=\frac{4 \times 5 \times 6}{3} \)and find the value of\( (1 \times 2)+(2 \times 3)+(3 \times 4)+(4 \times 5)+(5 \times 6) \)
- A ]Solve the Following :$1 . 9 + ( -3)$$2 . -5 + ( -2)$$3 . 8 + 6$$4 . -3 - ( -5)$$5 . 9 - ( -4)$B ] Write the opposite number of the following numbers.$1 . 47$$2 . -21$$3 . -30$
- Show that the points $A (5, 6), B (1, 5), C (2, 1)$ and $D (6, 2)$ are the vertices of a square.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies