Cng Crisis in Pakistan Essay Example for Free

Cng Crisis in Pakistan Essay succession 18. 05. 2013 CHEMISTRY PAPER II Max. Marks 17 930 a. m. to 950 a. m. (Science Pre-Engineering Pre-Medical Groups) sequence 20 minutes SECTION A (MULTIPLE CHOICE QUESTIONS) (M. C. Qs. ) NOTE i) This section consists of 17 sectionalisation questions and in all are to be answered. Each question carries one mark. ii) Do not copy down the part questions in your answerbook. Write only the answer in full against the proper bit of the question and its part. ii) The work out number of your question paper is to be written in bold letters in the commencement ceremony of the answerscript. 1. Select the most appropriate answer for each from the given options i) The atomic number of an particle belong to group VA and 3rd period is * 7 * 13 * 15 * 23 ii) Elements of group IB are called * shape elements * Rare Earth metals * Coinage metals * Alkali metals iii) Hydride ion and Helium atom have the same * number of protons * number of electrons * number of neutrons * valencyiv) The number of neutrons in Protium is * zero * 1 * 2 * 3 ) The element having the symbol Ga belongs to this family * Carbon * Nitrogen * Boron * Beryllium vi) On burning in wasted of Oxygen, Sodium forms its * superoxide * peroxide * monoxide * dioxide vii) A mixture of potash aluminium nitrate and Aluminium powder is called * Duralumin * Ammonal * Carnallite * Alum viii) Ca2B6O11. 5H2O is the chemical formula of * Cryolite * Colemanite * Bauxite * Borax ix) The formula of Hypochlorous acid is * HOCl * HClO2 * HClO3 * HClO4 x) The metal ion having the highest number of unpaired electrons is * Mn? 2 * Fe? 2 * Co? 2 * Ni? 2 xi) The chemical name of laughing particle accelerator is Nitric oxide * Nitrous oxide* Nitrogen trioxide * Nitrogen pentoxide xii) This has the minimum hydration energy * Na+ * K + * Rb+ * Cs+ xiii) Cycloalkanes have the general formula * C Hn n2 2? * C Hn n2 * C Hn n2 2? * C Hn n2 4? xiv) Glycogen is a * Monosaccharide * Oligosac charide * Polysaccharide * Disaccharide xv) This gas was employ in the First World war * Phosgene gas * Mustard gas * Coal gas * ammonia water gas xvi) The hybridization in the Carbon atom of Carbonyl group is * sp * sp2 * sp 3 * d sp 2 3 xvii) All noble gases fulfill the Octet rule except * Kr * Ne * He * Ar