Doubtly
@Doubtly · Joined Feb 2021
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- Classify nutrients according to their sources. Answer: By source, the 16 plant nutrients come from air (carbon, oxygen), water (hydrogen, oxygen) and soil (the remaining 13). SourceNutrie... 1
- Distinguish between macronutrients and micronutrients. Give suitable examples. Macronutrients Micronutrients These are required in large quantities These are required in small quantities These do not indulge in enzyme a... 2
- sir why dont you invent things that promotes peace ? First of all strength respects strength. To protect the nation, nation should have adequate strength. Hence we need to equip ourselves with... 1
- छाता बारिश को तो नहीं रोक सकता :-APJ ABDUL KALAM छाता बारिश को तो नहीं रोक सकता परन्तु बारिश में खड़े रहने का हौसला अवश्य देता है। इसी प्रकार आत्म विश्वास सफलता की गारंटी तो नहीं देता परन्त... 1
- अगर तुम सूरज की तरह चमकना चाहते हो तो पहले सूरज की तरह जलो। अगर तुम सूरज की तरह चमकना चाहते हो तो पहले सूरज की तरह जलो। चलिए आज हम इस वाक्य का विश्लेषण करेंगे। शायद आप ने सुना हो। अपने विचार अवश्य बता... 1
- शांतिपूर्ण जीवन के लिए दो नियम है। ~अब्दुल कलाम शांतिपूर्ण जीवन के लिए दो नियम है। असफलता में उदासीनता कभी दिल में नहीं उतरनी चाहिए, और सफलता में अहंकार कभी भी दिमाग में नहीं जाना चाहिए। श... 1
- मैं हैंडसम नहीं हूं लेकिन मैं अपना हाथ किसी ऐसे व्यक्ति को दे सकता हूं, जिसे मदद की जरूरत हो . मैं हैंडसम नहीं हूं लेकिन मैं अपना हाथ किसी ऐसे व्यक्ति को दे सकता हूं, जिसे मदद की जरूरत हो … क्योंकि खूबसूरती की जरूरत दिल में होती है, चे... 1
- What are emulsions? What are their different types? Give example of each type. Emulsions: It is a colloidal system in which both the dispersed phase and the dispersion medium are liquids, e.g., milk consists of small dr... 1
- What are lyophilic and lyophobic sols ? Give one example in each case. Lyophilic colloids: The colloidal solution in which the particles of the dispersed phase have a great affinity (or love) for the dispersion... 1
- Discuss the effect of pressure and temperature on the adsorption of gases on solids. (i) Adsorption decreases with an increase in temperature since it is an exothermic process by applying Le Chatelier’s principle the reaction... 1
- Why is adsorption always exothermic? When a gas is adsorbed on the surface of a solid, its entropy decreases, i.e., ΔS is negative. Now, ΔG = ΔH-TΔS For a process to be spontane... 1
- What role does adsorption play in heterogeneous catalysis? In heterogenous catalysis, generally the reactants are gaseous whereas catalyst is a solid. The reactant molecules are adsorbed on the surfa... 1
- What is an adsorption isotherm? Describe Freundlich adsorption isotherm. Adsorption isotherm represents the variation of the mass of the gas adsorbed per gram of the adsorbent with pressure at constant temperature... 1
- What are the factors which influence the adsorption of a gas on a solid? The adsorption of a gas on a solid surface is an example of physical adsorption. It is influenced by the following factors : (i) Nature of t... 2
- Give reason why a finely divided substance is more effective as an adsorbent? Finely divided substance has large surface area and hence greater adsorption. 1
- What is the difference between physical adsorption and chemisorption ? Physisorption Chemisorption Weak van der Waals’ forces present. Strong chemical bond forces present. Low; of the order of 20-40 kJ/mol. High... 1
- Distinguish between the meaning of the terms adsorption and absorption. Give one example of each. Adsorption Absorption Substance is concentrated only at the surface and does notpcnctrate from the surface to the bulkofthe adsorbent. Subst... 1
- A short bar magnet placed with its axis at 30° with a uniform external magnetic field of 0.25 T Torque x = MB sinθ 4.5 × 10⁻² = M (0.25 sin 30°) Magnetic dipole moment, M = 0.36 J T⁻¹. 1