TEXTBOOKS – All Punjab & AJK Boards
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Ejaz H. Abbasi
TEXTBOOKS
Here are textbooks in PDF for different educational boards across Pakistan: NOTE: These are PDF images of the real papers. Download and use these papers now, and ask us in comment section if you have any question or suggestion relating…
Past Papers, Tarjama-tul-Quran-12th
Dear Students and Respected Teachers! These are Tarjama-tul-Quran class 12th up-to-date papers for all Punjab boards. More papers of coming exams will also be added regularly as soon as the exams are conducted. Here are the PDFs of all these…
Past Papers, Tarjama-tul-Quran-11th
Dear Students and Respected Teachers! These are Tarjuma-tul-Quran class 11th up-to-date papers for all Punjab boards. More papers of coming exams will also be added regularly as soon as the exams are conducted. Here are the PDFs of all these…
Past Papers, Tarjuma-tul-Quran-10th
Dear Students and Respected Teachers! These are Tarjuma-tul-Quran-10th up-to-date papers of all Punjab boards. These are 2024 past papers. More papers of coming exams will also be added regularly as soon as the exams are conducted. Here are the PDFs…
Past Papers, Chemistry-10th
Dear Students and Respected Teachers! These are up-to-date papers for Chemistry-10th for all Punjab boards. These include 2018 to 2024 past papers of all nine educational boards of Punjab. These are PDFs of all these past papers in descending annual…
Past Papers, Chemistry-9th
Dear Students and Respected Teachers! These are 9th class up-to-date papers for Chemistry for all Punjab boards. These are six year past papers from 2018 to 2024 for nine educational boards of Punjab. Here are the PDFs of all these…
Calculate the percentage of nitrogen in NH2CONH2.
ANSWER: Molar mass of urea = 14+2+12+16+14+2 = 60 g Mass of N in the molecule = 28 g % of N = Mass of N / Molar Mass ✕ 100 = 28 gmol-1 / 60 gmol-1 ✕ 100 =…
Differentiate between qualitative and quantitative analyses.
ANSWER: QUALITATIVE ANALYSIS In qualitative analysis, the elements present in a compound are identified. QUANTITATIVE ANALYSIS In quantitative analysis, the relative amount of each element in a compound is determined. (Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 29)
What is the justification of two equally strong peaks in the mass spectrum for bromine, while for iodine only one peak at 127amu is indicated?
ANSWER: In mass spectrum, the number of peaks tells about the number of isotopes, while the heights of the peaks represent their natural abundance. Two equally strong peaks in the mass spectrum of bromine indicate that bromine has two isotopes…