Science: Class X NCERT Solutions

  Class X Science – Chapter 3 Metals and Non-metals (NCERT Solutions – Short & Clear) 1. What are metals? Write two physical properties. Answer: Metals are elements that usually lose electrons and form positive ions. Two physical properties: Metals are malleable (can be beaten into sheets). Metals are good conductors of heat and electricity. 2. What are non-metals? Write two physical properties. Answer: Non-metals are elements that usually gain electrons and form negative ions. Two physical properties: Non-metals are poor conductors of heat and electricity. Non-metals are not malleable and are usually brittle. 3. Why are metals called electropositive elements? Answer: Because metals lose electrons easily and form positive ions. 4. Write the difference between metals and non-metals. Answer: Metals Non-metals Lose electrons Gain electrons Good conductors Poor conductors Malleable and ductile Brittle Form basic oxides Form acid...

Class X Science Chapter 2 – Acids, Bases and Salts এচিড, ক্ষাৰক আৰু লৱণ NCERT Solutions  NCERT সমাধান  Questions from the Textbook পাঠভিত্তিক প্ৰশ্ন  Q1. Why should curd and sour substances not be kept in brass and copper vessels?  প্ৰশ্ন ১. দৈ আৰু টেঙা পদাৰ্থ পিতল আৰু তামৰ পাত্ৰত কিয় ৰাখিব নালাগে? Answer: Curd and sour substances contain acids. These acids react with copper and brass to form poisonous salts, which can cause food poisoning. দৈ আৰু টেঙা পদাৰ্থত এচিড থাকে। এই এচিডবোৰে তাম আৰু পিতলৰ লগত বিক্ৰিয়া কৰি বিষাক্ত লৱণ সৃষ্টি কৰে, যাৰ ফলত খাদ্য বিষক্ৰিয়া হ’ব পাৰে। Q2. Which gas is usually liberated when an acid reacts with a metal? How will you test this gas? প্ৰশ্ন ২। এচিডে কোনো ধাতুৰ সৈতে বিক্ৰিয়া কৰিলে সাধাৰণতে কোনটো গেছ মুক্ত হয়?  এই গেছটো কেনেকৈ পৰীক্ষা কৰিব? Answer: The gas is hydrogen . It is tested by the pop sound produced when a burning matchstick is brought near the gas. গেছটো হ’ল হাইড্ৰ’জেন। গেছৰ ওচৰলৈ জ্বলি থকা মেচৰ লাঠি আ...