D- block elements are called transition elements since they have unpaired electrons in their d orbital. Elements in which last electron ( also called differentiating electron ) enters the ante-penultimate energy level are called F-Block elements . These elements have also been called inner transition elements

All these organic compounds contain carbon - oxygen double bond, i.e., >C=O called the carbonyl group.

Early this year, I found myself aboard a Russian research vessel the Akademik Shokalskiy heading towards the coldest, driest, windiest continent in the world: Antarctica. My journey began 13.09 degrees north of the Equator in Madras, and involved crossing nine time zones, six checkpoints, three bodies of water, and at least as many ecospheres.

Amines are the derivatives of Ammonia, obtained by replacement of one, two or all the three hydrogen atoms by alkyl or aryl groups.

Biomolecules may be defined as complex lifeless chemical substance which form the basis of life, i.e., they not only build up living creatures but are also responsible for their growth , maintenance and ability to reproduce. Living system is composed of non-living atoms and molecules. 

These are some of the extract-based questions of The Tiger King written by Kalki. Students are advised to go through them one by one to understand the chapter well so that they can score better in English.

खटका का अर्थ है भय , संदेह इत्यादि । यह एक प्रकार का अलंकार विशेष है । किसी एक स्वर को आगे पीछे के स्वरों के साथ शीघ्रता से उत्पन्न करने को खटका कहते है । खटका प्राचीन गमक का ही एक प्रकार है । इसके प्रयोग से किसी भी रचना की सौंदर्य वृद्धि होती

हमारे परंपरागत संस्कारों का परिणाम रागों का समय - सिद्धांत है । रागों के समय सिद्धांत का वर्णन सर्वप्रथम नारद मुनि ने अपने द्वारा रचित ग्रंथ संगीत मकरंद में किया । उन्होंने यह ग्रंथ नौंवी शताब्दी में लिखा। संगीत सकरद में तीसरे अध्याय में रागों के समय सिद्धांत का पूरा वर्णन मिलता है । यह

राग वर्गीकरण - संगीत के क्रमिक विकास के साथ और समय के परिवर्तन के अनुसार संगीत का जो रूप रहा है उसका अध्ययन भरत द्वारा लिखित नाट्यशास्त्र संगीत का प्रमाणिक ग्रंथ मिलता है । वैसे तो यह ग्रंथ नाट्य पर आधारित है , परन्तु नाट्य से संबंधित संगीत का पूरा विवरण इस ग्रंथ से प्राप्त

Elements are the basic units of all types of matter in the universe. Elements are found to occur in nature either in free state or in the combined state i.e in the form of compounds This is mainly due to the reason that different elements have different chemical reactivities.