Doubtly
@Doubtly · Joined Feb 2021
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- Explain the trend in oxidation state of elements from nitrogen to bismuth. Group 15 elements have five valence electrons (ns² np³). Common oxidation states are -3, +3 and +5. The range of oxidation state is from -3... 1
- What are silicones? Where are they used? Silicones are organosilicon polymers having R₂SiO (where, R = CH₃ or C₆H₅ group) as a repeating unit held together by Since the empirical fo... 1
- Find out the difference between White phosphorus and Red phosphorus White phosphorus Red phosphorus It consists of discrete tetrahedral P₄ molecules. It consists chains of P₄ molecules linked together by cova... 1
- Find out the difference between Diamond and Graphite Diamond Graphite It has a three-dimensional network structure. It has a two-dimensional hexagonal layered structure. In diamond, each carbon... 1
- Name a molecule having banana bond. Diborane (B₂H₆) 2
- What is hybridization of Al in AlCl3? Al is sp² hybridized in AlCl₃. 2
- Explain the trend of the following in group 13 elements : A. atomic radii B. ionization enthalpy C. electron affinity A. Atomic radii: In group 13, on moving down the group, the atomic radii increases from B to Al. However, there is an anomaly observed in th... 1
- Give the formula of a compound in which carbon exhibit an oxidation state of A. +4 B. +2 C. -4 A. CCl₄ B. CO C. CH₄ 2
- PbCl4 is less stable than PbCl2 i. Pb has electronic configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p². ii. Due to poor shielding of 6s² electrons by inner d and f electrons, it is diff... 1
- Ga3+ salts are better reducing agent while Tl3+ salts are better oxidising agent. i. Both gallium (Ga) and thallium (Tl) belong to group 13. ii. Ga is lighter element compared to thallium Tl. Therefore, its +3 oxidation st... 1
- Identify the group 14 element that best fits each of the following description. i. Carbon (C) ii. Carbon iii. Tin (Sn) and lead (Pb) iv. Carbon 2
- Which of the following shows most prominent inert pair effect ? a. C b. Si c. Ge d. Pb d. Pb shows most prominent inert pair effect 2
- Thallium shows different oxidation state because …………… a. of inert pair effect b. it is inner transition element a. of inert pair effect Thallium shows different oxidation state because of inert pair effect 1
- Haber’s process is used for preparation of …………. a. HNO3 b. NH3 c. NH2CONH2 d. NH4OH b. NH3 Haber’s process is used for preparation of b. NH3 2
- ………… is inorganic graphite. a. borax b. diborane c. boron nitride d. colemanite c. boron nitride is inorganic graphite. 2
- Which of the following is not an allotrope of carbon ? a. buckyball b. diamond c. graphite d. emerald d. emerald is not an allotrope of carbon 2
- If 0.2 mol of the following substances are required how many grams of those substances should be taken? (i) We know that, Molar mass= sum of constituent atomic masses Molar mass of NaCl= 23 + 35.5 = 58.5 g/mol Number of moles of a substance= Mo... 1
- Deduce the number of molecules of the following compounds in the given quantities. (i) 32g oxygen, (ii) 90g water (i) 32 g of oxygen : Molecular mass of O_(2 )= 2x16=32 Number of moles of O_(2 )= Mass of O₂ in grams/Molecular mass of O_(2 )= 32/32 = 1mol... 1