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CHEMISTRY

Chemistry MCQs

چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Which compound will not show geometrical isomerism? 1,3-dimethylcyclopentane, But-2-ene, 1,2-dimethylcyclopropane, Pent-1-ene
  1. 1,3-dimethylcyclopentane
  2. But-2-ene
  3. 1,2-dimethylcyclopropane
  4. Pent-1-ene
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If ionization energy of an element is greater then _____?
  1. More is it's electropositivity
  2. Less is it's metallic character
  3. More is it's atomic radius
  4. None of these
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All of following have two bond pairs and show linear geometry except? CO₂, SnCl₂, CS₂, HCN
  1. CO₂
  2. SnCl₂
  3. CS₂
  4. HCN
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The ionic compound among the following with the highest lattice energy is _____? CsI, LiF, NaCl, KCl
  1. CsI
  2. LiF
  3. NaCl
  4. KCl
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When SHE is connected with Cu electrode using salt bridge and external wire _____?
  1. H⁺ reduces
  2. Cu reduces
  3. Cu⁺² reduces
  4. None of these
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Consider the given reaction: N₂ + 3H₂ → 2NH₃ If 56 g of N₂ reacts with 12 g of H₂ and produces 51 g of NH₃, what is the theoretical yield (TY) of NH₃ and the percentage yield (PY) of the reaction? (Molar mass of N₂ = 28 g/mol, H₂ = 2 g/mol and NH₃ = 17 g/mol)
  1. TY = 34 g and PY = 33%
  2. TY = 68 g and PY = 75%
  3. TY = 34 g and PY = 75%
  4. None of these
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During Clemmenson reduction of aldehyde and ketone, carbonyl group into alkane group is carried out with ____?
  1. Zn/Hg conc.HCl
  2. H₂ and Pd
  3. LiAlH₄
  4. None of these
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Which is not true about benzene? Sp² hybridization, Fractional bond order, 6 sites for monosubstitution, No elimination reaction
  1. Sp² hybridization
  2. Fractional bond order
  3. 6 sites for monosubstitution
  4. No elimination reaction
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At start of reaction _____?
  1. Instantaneous rate is high
  2. Average rate is high
  3. Both rates are same
  4. None of these
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When one mole of a substance is decomposed preferably as compared to evaporation then decomposition has _____?
جب کسی مادے کا ایک تل بخار کے مقابلے میں ترجیحی طور پر گل جاتا ہے تو پھر سڑن _____ ہوتا ہے؟
  1. Equal energy
  2. Low energy
  3. High energy
  4. None of these
(0)
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