UP Board Class 12 Chemistry Long Answer Solved Practice Paper First Set –I

Mar 28, 2017, 10:16 IST

Jagranjosh presents UP Board Class 12th Chemistry Solved Practice Paper, Set - 1 based on the syllabus of Paper First. This paper is important for the coming Chemistry exam of the academic year 2016 – 17. In this article we are going to provide you the 10 long questions for the chemistry paper first paper which have been taken from last 5 years’ chemistry first paper.

As up board class 12 chemistry papers exam is approaching, students heart beat is increasing exponentially. This is the time when all the up board class 12th students are struggling for to completing the whole syllabus in the respective subjects.
It becomes very important to understand the pattern of up board papers. In all the up board papers, there are 3 to 4 sections where questions are framed as per the marks allocated.
To overcome from the dilemma that which section is important and how to cover the long questions with precise answer, we are going to give you some selective questions from previous year question paper.
In this article we are going to provide you the 10 long questions for the chemistry paper first paper which have been taken from last 5 years’ chemistry first paper.
To answer the question in a precise way will only be possible by practicing the questions and answers as per the marking scheme and time management
Chemistry is the subject where question are coming from three sections like physical chemistry, organic chemistry and inorganic chemistry.
In the UP Board class 12 chemistry first papers, questions are coming only from all the 3 sections mentioned above.
Have a look on some questions and their answers which are given below:

chemistry practice paper

chemistry practice paper

प्रश्न :  काचँ को अतिशीतित द्रव क्यों कहा जाता है?इसके निर्माण में प्रयुक्त कच्चे पदार्थों के नाम लिखिए। पाइरेक्स ग्लास के मुख्य अवयव क्या है। उसका उपयोग लिखिए।

उत्तर:   काचँ के निर्माण में प्रयुक्त प्रारम्भिक पदार्थों को उचित अनुपात में निला कर साइमेन्स मार्टिन की खुले तल की भट्टी में गर्म करता हैं। अभिक्रियाओं के फलस्वरूप प्राप्त मिश्रण  भट्टीके उच्च ताप पर द्रव अवस्था में रहता है।इसे लगभग 800° Cतक ठण्डा करके साँचों में ढाल लेते हैं। साँचों में ढाले द्रव को धीरे धीरे साधारण ताप पर ठण्डा करने से काँच का उपकरण तैयार हो जाता है। इसी कारण काँच को  अतिशीतित द्रव कहा जाता है।

काँच के निर्माण में प्रयुक्त कच्चे पदार्थों के नाम-

  1. बालु,रेत,क्वार्टज या SiO2
  2. मार्बल, खडिया या CaCO3
  3. बोरिक एसिड
  4. सोडा ऐश
  5. सोडियम सल्फेट और कार्बन का मिश्रण
  6. रेड लेड आदि।

पाइरेक्स ग्लास के मुख्य अवयव है- Na3BO3, Na2CO3, AlBO3, Al2O3, SiO2

इसका उपयोग उच्च कोटि के काँच के उपकरण बनाने में होता है।

Click here, to get the complete paper


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