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| Answer» <html><body><p><strong>Answer:</strong></p><p>1.Acetophenone</p><p>The compound that is used in pistachio flavor in ice <a href="https://interviewquestions.tuteehub.com/tag/cream-938366" style="font-weight:bold;" target="_blank" title="Click to know more about CREAM">CREAM</a> is Acetophenone. It is an organic compound and the simplest aromatic ketone.</p><p></p><p></p><p>2.The following chart describes the most common oxidation states of the period 3 elements. Scandium is one of the two elements in the first transition metal period which has only one oxidation state (zinc is the other, with an oxidation state of +2). All the other elements have at least two different oxidation states.</p><p></p><p></p><p>3.Van-Arkel method :</p><p>Crude metal is <a href="https://interviewquestions.tuteehub.com/tag/heated-1017243" style="font-weight:bold;" target="_blank" title="Click to know more about HEATED">HEATED</a> with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by <a href="https://interviewquestions.tuteehub.com/tag/heating-1017297" style="font-weight:bold;" target="_blank" title="Click to know more about HEATING">HEATING</a> to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form a volatile compound. TTiI 4</p><p> leaving behind the impurities .TTil 4</p><p> is further heated to 1700K when it decomposes to give pure titanium.</p><p>van-Arkel method involes use of II2</p><p> to form volatile iodide of metals which on decomposition gives pure metals.</p><p></p><p></p><p>4.ΔU= <a href="https://interviewquestions.tuteehub.com/tag/change-913808" style="font-weight:bold;" target="_blank" title="Click to know more about CHANGE">CHANGE</a> in internal energy</p><p></p><p>W=−300J(System)</p><p></p><p>ΔU= q+W</p><p></p><p> ΔU=600J−300J=300J</p><p></p><p>Thus, the change in internal energy is 300J</p><p></p><h3>be happy ☺️❤️☺️</h3><h2>l hope it will help u ☺️☺️☺️</h2></body></html> | |