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  ICSE Class X Mid-term 2024 : Mathematics
  	B)-4 pabitranath83

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  ICSE Class X Prelims 2023 : Geography (Jamnabai Narsee School (JNS), Mumbai)
  	Sanitary landfills prevent environmental contamination by isolating waste from air, water, and soil, reduce health risks, control odors, and allow for waste recycling, unlike open dumping, which leads to pollution and disease. oswal001

  CBSE Class 11 Pre Board 2021 : Physics - Annual Final (CBSE Gulf Sahodaya Qatar Chapter, Doha)
  	yes, if there is another body with the same velocity  angelbinesh77

  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)
  	Zinc Tin Zinc provides better protection for iron objects because it is more reactive than iron and forms a protective layer of zinc oxide when exposed to air. This galvanization process sacrificially corrodes to protect the underlying iron. Tin, while also used for coating, is less effective as it is less reactive than iron. ghjhjhjlkj

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  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)
  	CH2=CHCl Branched alkyl groups The monomer of PVC (polyvinyl chloride) is vinyl chloride, which has the structure CH2=CHCl. The structural unit that makes detergents non-biodegradable is typically branched alkyl groups. These branched structures are more resistant to breakdown by microorganisms, leading to environmental persistence. ghjhjhjlkj

  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)
  	Zinc Tin Zinc provides better protection for iron objects because it is more reactive than iron and forms a protective layer of zinc oxide when exposed to air. This galvanization process sacrificially corrodes to protect the underlying iron. Tin, while also used for coating, is less effective as it is less reactive than iron. ghjhjhjlkj

  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)
  	No If the activation energy (Eact) of a reaction is zero, the rate constant will not depend on temperature (T). This is because the Arrhenius equation, which relates rate constant to temperature, becomes independent of T when Eact = 0. In this case, the rate constant would remain constant regardless of temperature changes. ghjhjhjlkj

  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)
  	A The liquid with the lower boiling point will have a higher vapor pressure at a given temperature. Liquid A has a boiling point of 140°C, which is lower than liquid B's boiling point of 180°C. Therefore, at 90°C, liquid A will have a higher vapor pressure. ghjhjhjlkj

  CBSE Class 12 Board Exam 2020 : Chemistry (Series 1)

  When anisole is treated with various reagents, it undergoes different reactions based on the nature of the reagent. Here are the structures of the products formed: a) HI (Hydroiodic acid): The product is phenol and methyl iodide (CH3I). HI cleaves the ether linkage. C6H5-O-CH3 + HI → C6H5-OH + CH3I b) Br2/FeBr3 (Bromination): The product is 4-bromoanisole. Anisole undergoes electrophilic aromatic substitution, with the methoxy group directing to the para position. C6H5-O-CH3 + Br2 → 4-Br-C6H4-O-CH3 + HBr c) CH3COCl/AlCl3 (Friedel-Crafts acylation): The product is 4-methoxyacetophenone. The reaction occurs at the para position due to the directing effect of the methoxy group. C6H5-O-CH3 + CH3COCl → 4-CH3CO-C6H4-O-CH3 + HCl d) CH3Cl/AlCl3 (Friedel-Crafts alkylation): The product is 4-methylanisole. Again, the methoxy group directs the substitution to the para position. C6H5-O-CH3 + CH3Cl → 4-CH3-C6H4-O-CH3 + HCl These reactions demonstrate the reactivity of anisole and the directing effect of the methoxy group in electrophilic aromatic substitutions. ghjhjhjlkj

  Pune University - Msc - I (Sem - II) : Metamorphic Petrology, April 2010

  Metamorphism is the process of changing a rock's mineralogy, texture, or chemical composition due to exposure to heat, pressure, or chemically active fluids, without melting the rock completely. This process occurs in the solid state and results in the formation of metamorphic rocks. Common minerals found in metamorphic rocks include: 1. Quartz 2. Feldspars 3. Micas (biotite, muscovite) 4. Amphiboles (hornblende) 5. Garnet 6. Staurolite 7. Kyanite 8. Sillimanite 9. Andalusite 10. Chlorite Genesis and occurrence: These minerals form through various metamorphic reactions, often involving the breakdown of pre-existing minerals and the growth of new ones. Their occurrence depends on factors such as: 1. Original rock composition 2. Temperature and pressure conditions 3. Availability of fluids 4. Duration of metamorphism For example, garnet typically forms in medium to high-grade metamorphic rocks, while chlorite is more common in low-grade metamorphism. Quartz and feldspars are often present in the original rock and may persist through metamorphism. Micas form through the breakdown of clay minerals or feldspars. The aluminum silicates (kyanite, sillimanite, and andalusite) form under specific pressure-temperature conditions and are useful indicators of metamorphic grade. chetannagarale

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