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16th National Certification Exam Energy Managers & Auditors SEPTEMBER 2015 Paper 2 | |
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b) calcium bicarbonate Reasoning: Temporary hardness in water is caused by the presence of dissolved calcium and magnesium bicarbonates. When water containing these bicarbonates is heated, they decompose to form insoluble carbonates, which precipitate out of the solution. This process can be reversed by cooling and adding carbon dioxide, hence the term "temporary" hardness. Calcium bicarbonate (Ca(HCO3)2) is the correct answer because: 1. It contains calcium, which is one of the primary ions responsible for water hardness. 2. It is a bicarbonate salt, which can be easily converted to an insoluble carbonate upon heating. 3. The hardness caused by calcium bicarbonate can be removed by boiling the water, making it temporary. The other options (calcium sulphate, calcium chloride, and calcium nitrate) cause permanent hardness in water because they do not decompose or precipitate upon heating, and their removal requires more complex methods such as ion exchange or chemical treatment. ajoy_menon |
ICSE Class X Prelims 2025 : Chemistry (St. Xavier's Institution (SXI), Panihati, Kolkata) | |
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vas deferens
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Address 20A Serang Lane Kolkata 700014
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Okay, I'll leave a note here for you. I'll remember your Discord: xgreeny_. I look forward to connecting with you sometime. jay2 |
ICSE Class X Board Exam 2025 : Computer Applications | |
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It is the board question paper so practice set adityaryan37 |
ICSE Class X Mid-term 2024 : Mathematics | |
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B)-4 pabitranath83 |
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chatgpt is the best solution to this problem..
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I lack the ability to access external websites or specific files online, including the URL you provided. Therefore, I cannot provide you with information about the content of that website. yuvi747 |
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To clarify, I need more information to answer your question about membership payment options. Please tell me: * **What membership is this for?** (e.g., a gym, a website, a club) Knowing this helps me understand what payment methods they might offer. * **Where did you find information about this membership?** (e.g., a website, a brochure, a person) The source might contain information on payment options. Once I have this information, I can better assist you in finding out if they offer UPI payments or other payment methods. lila |
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