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    • Posted by Yash Hardeep 4 years ago

    UP Board > Class 06 > Others
    • 2 answers

    Yash Hardeep 2 years, 9 months ago

    Why did the author and his family decide to cit short their trip to srinagar

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    Gaurav Seth 4 years ago

    he earth is called a unique planet because:

     

    1. It is the only planet which has favorable conditions that support life. It is neither too hot nor too cold.
    2. It has water and air, which are very essential for our survival.
    3. The air has life-supporting gases like oxygen.

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    • Posted by Sachin Kumar 4 years ago

    UP Board > Class 09 > कंप्यूटर
    • 1 answers

    Yogita Ingle 4 years ago

    During the 1970s, Large Scale Integration (LSI) of electronic circuits allowed integration of complete CPU on a single chip, called microprocessor.

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    • Posted by Ruchi Bind Ako 4 years ago

    UP Board > Class 10 > होम साइंस
    • 1 answers

    Ruchi Bind Ako 4 years ago

    Tell me

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    • Posted by Tushar Srivastava 4 years, 1 month ago

    UP Board > Class 11 > हिंदी जनरल
    • 0 answers
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    • Posted by Tanu Yadav 4 years, 1 month ago

    UP Board > Class 11 > गणित
    • 0 answers
    ANSWER

    • Posted by Manish Raj 4 years, 1 month ago

    UP Board > Class 12 > हिंदी
    • 1 answers

    Manish Raj 4 years, 1 month ago

    X square ka avkalan Kitna hoga

    3Thank You

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    • Posted by Numer Pathan 4 years, 1 month ago

    UP Board > Class 05 > Others
    • 2 answers

    Pankaj Yadav 4 years ago

    KXJZL

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    Ranveer Singh Singh 4 years ago

    ?

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    • Posted by Shreya Rajpoot 4 years, 1 month ago

    UP Board > Class 11 > अर्थशास्त्र
    • 1 answers

    Shivani Jhariya 3 years, 11 months ago

    11099ch02

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    • Posted by Manav Dubey 4 years, 1 month ago

    UP Board > Class 09 > English
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    It was the invention of an instrument named ‘Crescograph’ which could measure the growth of the plants.

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    • Posted by Sankalp Singh 4 years, 1 month ago

    UP Board > Class 10 > Others
    • 1 answers

    Vaishnavi Seth 1 year, 11 months ago

    Music lovers

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    • Posted by Mir Owais 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

     No, the victims of the Bhopal Gas Tragedy did not get justice. They are still waiting for it. They still fail to avail safe drinking water, healthcare facilities and jobs for the people poisoned by DC plant. Anderson, the UC chairman, who faces criminal charges, is not yet put behind the bars.  

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    • Posted by Mir Owais 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 0 answers
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    • Posted by Mir Owais 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 0 answers
    ANSWER

    • Posted by Shubham Gupta 4 years, 1 month ago

    UP Board > Class 12 > रसायन विज्ञान
    • 1 answers

    Vaibhavi Srivastava 3 years, 11 months ago

    हेबर विधि द्वारा अमोनिया के औद्योगिक निर्माण का नामांकित चित्र सहित वर्णन कीजिए। इसके दो प्रमुख गुण एवं दो उपयोग लिखिए। इस विधि में ला-शातेलिए नियम का क्या महत्त्व है हेबर विधि का सिद्धान्त–यदि शुद्ध नाइट्रोजन और हाइड्रोजन के 1 : 3 अनुपात के मिश्रण को गर्म किया जाए तो अमोनिया बनती है। यह एक ऊष्माक्षेपी उत्क्रमणीय अभिक्रिया है और क्रिया के पश्चात् आयतन में कमी होती है, इसलिए ला-शातेलिए के नियमानुसार कम ताप और अधिक दाब पर अमोनिया अधिक उत्पन्न होगी। कम ताप पर अभिक्रिया का वेग बढ़ाने के लिए एक उत्प्रेरक प्रयोग किया जाता है। इस अभिक्रिया का उत्प्रेरक की उपस्थिति में अनुकूलतम ताप 450°-500°C तथा उच्च दाब 200 वायुमण्डल है; क्योंकि अभिक्रिया उत्क्रमणीय है, इसलिए अमोनिया को बराबर क्रिया क्षेत्र से हटाने के बाद, अमोनिया गैस अधिक बनेगी। इस अभिक्रिया में लोहे का बारीक चूर्ण (उत्प्रेरक) तथा मॉलिब्डेनम (उत्प्रेरक वर्धक) की सूक्ष्म मात्रा प्रयुक्त होती है। इसमें गैसीय मिश्रण शुद्ध होना चाहिए जिससे उत्प्रेरक विषाक्त न हो। विधि- शुद्ध N2 तथा H2 को 1 : 3 अनुपात में मिलाकर 200 वायुमण्डल दाब पर तप्त लोहे के बारीक चूर्ण (उत्प्रेरक) को, जिसमें मॉलिब्डेनम (उत्प्रेरक वर्धक) मिला होता है, 500°C ताप पर गर्म करते हैं। इस विधि में 10 – 15% अमोनिया बनती है, जिसे संघनित्र में प्रवाहित करके द्रवित कर लेते हैं। शेष गैसों को फिर से उत्प्रेरक कक्ष में प्रवाहित करते हैं जिससे N2 व H2 के संयोजन द्वारा NH3 का लगातार उत्पादन होता रहता है। रासायनिक गुण  1. क्षारीय गुण – यह क्षारीय गैस है तथा लाल लिटमस को नीला कर देती है। यह अम्लों से क्रिया करके लवण बनाती है। 2. धातु ऑक्साइडों का अपचयन – यह धातु ऑक्साइडों को अपचयित कर देती है। उपयोग  1. प्रयोगशाला में अभिकर्मक के रूप में।  2. बर्फ बनाने तथा कोल्ड स्टोरेज में प्रशीतक के रूप में; क्योंकि इसके वाष्पन की गुप्त ऊष्मा 327 कैलोरी/ग्राम (उच्च) होती है

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    • Posted by Sayed Ibrahim Ali 3 years, 10 months ago

    UP Board > Class 12 > लेखाशास्त्र
    • 2 answers

    Krmchnd Kumar 3 years, 5 months ago

    Sakh Niti Se Kya aashay Hai

    1Thank You

    Krmchnd Kumar 3 years, 8 months ago

    Sakh Niti se kya hal hai

    0Thank You

    ANSWER

    • Posted by Sayed Ibrahim Ali 4 years, 1 month ago

    UP Board > Class 12 > लेखाशास्त्र
    • 0 answers
    ANSWER

    • Posted by Anand Mishar 4 years, 1 month ago

    UP Board > Class 05 > Others
    • 1 answers

    J Deep Das 4 years ago

    Problem set 28

    0Thank You

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    • Posted by Aditi Gangwar Gangwar 4 years, 1 month ago

    UP Board > Class 12 > गणित
    • 1 answers

    Anuj Soni 4 years ago

    Konsa question

    1Thank You

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    • Posted by Adarsh Srivastava 4 years, 1 month ago

    UP Board > Class 12 > गणित
    • 3 answers

    Ravi Sahani 4 years ago

    Hello

    0Thank You

    Ashish Kumar 4 years ago

    2x / 1 + x² = sin2A

    0Thank You

    Ashish Kumar 4 years ago

    Hello

    0Thank You

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    • Posted by Harsh Srivastava 4 years, 1 month ago

    UP Board > Class 12 > गणित
    • 1 answers

    Akash Kumar 4 years, 1 month ago

    Direntiativ

    3Thank You

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    C

    • Posted by Neha Prajapati 4 years ago

    UP Board > Class 10 > सामाजिक विज्ञान
    • 0 answers
    ANSWER

    • Posted by Ayushi Singh 4 years, 1 month ago

    UP Board > Class 09 > सामाजिक विज्ञान
    • 0 answers
    ANSWER

    • Posted by Sudhanshu Patel 4 years, 1 month ago

    UP Board > Class 09 > हिंदी
    • 2 answers

    Niteesh Kumar 4 years ago

    Hai

    0Thank You

    Saima Parveen 4 years, 1 month ago

    Chapter 2 ki exercise

    0Thank You

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    • Posted by Ritesh Singh Rahul 3 years, 4 months ago

    UP Board > Class 07 > Others
    • 2 answers

    Yasodha Yasodha 4 years ago

    Mm

    0Thank You

    Ritesh Singh Rahul 4 years, 1 month ago

    Xxx

    0Thank You

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    • Posted by Krishal Sahani 4 years, 1 month ago

    UP Board > Class 12 > जीव विज्ञान
    • 0 answers
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    • Posted by Ankita Chouhan 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 0 answers
    ANSWER

    • Posted by Ankita Chouhan 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 1 answers

    Sia ? 3 years, 6 months ago

    The policies and programmes of Indian government have also played an important role in stimulating the R&D efforts of the industry. Apart from providing fiscal and monetary incentives for firm-level R&D activities, the government is playing an active role in the development of common R&D infrastructure.

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    • Posted by Ankita Chouhan 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    Heavy Industries

    Light Industries

    Those industries whose raw materials and finished goods are heavy and bulky are categorised as heavy industries.  

    Those industries whose raw materials and finished goods are light are categorised as light industries.  

    These industries require heavy capital investments.

    These industries comparatively require less capital investments.

    Example- Iron and steel industry

    Example- Electrical industry

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    • Posted by Raj Thakur 4 years, 1 month ago

    UP Board > Class 12 > रसायन विज्ञान
    • 1 answers

    Himanshu Chaudhary 3 years, 11 months ago

    Using this f=9celsius/5+32

    1Thank You

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    • Posted by Santosh Vishwakarma 4 years, 1 month ago

    UP Board > Class 08 > Others
    • 0 answers
    ANSWER

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