Doubtly
@Doubtly · Joined Feb 2021
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- What are the four characteristics of modern historiography ? Following are the four characteristics of modern historiography: Its method is based on scientific principles. It begins with the formation... 1
- Explain Karl Marx’s ‘Class Theory’. Human relationships are shaped by the fundamental needs of people and the ownership as well as nature of prevalent means of production to me... 1
- 4. Complete the concept chart. Notable Scholars in Europe Notable Scholars in Europe : René Descartes was a French philosopher and mathematician who is widely regarded as the founder of modern Weste... 1
- Foucault called his method, ‘the archaeology of knowledge’. Foucault , in his book, ‘Archaeology of Knowledge’, argued that the prevailing practice of arranging historical events in a chronological or... 1
- Historical research was driven to focus in depth on various aspects of women’s life. The writings of Simone-de-Beauvoir helped in establishing the fundamentals of feminism. The feminist historiography emphasised not only on t... 1
- Explain the following concepts. Annales School At the onset of the twentieth century a new school of historiography arose in France, which is known as ‘Annales School’. Annales school gav... 1
- Explain the following concepts. Dialectics According to Hegel, grasping the meaning of any event happens in terms of two direct opposites. In order to understand the true nature of a... 1
- (B) Identify the wrong pair in the following, correct it and rewrite. Georg Wilhelm Friedrich Hegel – ‘Reason in History’ Wrong Pair : Karl Marx – Discourse on the Method. Correct Statement : Discourse on the Method was written by Rene’ Descartes. 1
- (A) Choose the correct option from the given options and complete the sentences. (1) It may be said that (1) It may be said that ……………… was the founder of modern historiography. (a) Voltaire (b) René Descartes (c) Leopold Ranké (d) Karl Marx Ans... 1
- Predict the shape and bond angles in the following molecules: a. CF4 b. NF3 c. HCN d. H2 S CF₄: tetrahedral, 109°28′; NF₃: trigonal pyramidal, about 102°; HCN: linear, 180°; H₂S: bent (angular), about 92°. a. CF₄ : C has 4 bond pai... 1
- Define : a. Bond Enthalpy b. Bond Length a. Bond enthalpy is the amount of energy required to break one mole of bonds of a particular type between two atoms in the gaseous state. It... 1
- In case of bond formation in Acetylene molecule : a. How many covalend bonds are formed ? Acetylene ( mathrmH-CequivC-H ): a. 5 covalent bonds; b. 3 σ bonds and 2 π bonds; c. sp hybridisation. a. There are two C–H single bonds and... 1
- BF3 molecule is planar but NH3 pyramidal. Explain B in BF₃ is sp² hybridised with no lone pair, so BF₃ is trigonal planar; N in NH₃ is sp³ hybridised with one lone pair, so NH₃ is pyramidal.... 1
- F-Be-F is a liner molecule but H-O-H is angular. Explain. In BeF₂ , Be is sp hybridised with no lone pairs, so the molecule is linear (180°); in H₂O , O is sp³ hybridised with two lone pairs, so the... 1
- Identify the type of orbital overlap present in a. H2 b. F2 c. H-F molecule. Explain diagramatically a. H₂ : s–s overlap. b. F₂ : p–p (head-on) overlap. c. HF: s–p overlap. All three bonds are σ bonds. H₂ (s–s): each H has a half-filled sphe... 1
- Which type of hybridization is present in ammonia molecule? Ammonia has sp³ hybridisation; its shape is trigonal pyramidal with an H–N–H bond angle of about 107°. Nitrogen (Z = 7) is 1s²2s²2p_x¹2p_y¹2... 1
- Give reasons for: a. Sigma (σ)bond is stronger than Pi (π)bond. b. HF is a polar molecule a. Sigma (σ) bond is stronger than pi (π) bond. A σ bond is formed by head-on (axial) overlap of orbitals along the internuclear axis, so th... 1
- In Ammonia molecule the bond angle is 1070 and in water molecule it is Both N in NH₃ and O in H₂O are sp³ hybridised, but they have different numbers of lone pairs, and lone pairs repel more strongly than bond p... 1