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غیر نامیاتی اور نامیاتی کیمیا
7 سوالات: ای کیٹ کیمیا، جوابات اور وضاحت کے ساتھ۔
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What is the shape of the SF6 molecule?
- 1 Tetrahedral
- 2 Octahedral
- 3 Trigonal bipyramidal
- 4 Square planar
جواب دیکھیں
درست جواب: Octahedral
Sulphur has six bond pairs and no lone pairs, which gives an octahedral shape.
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Which catalyst is used in the Haber process for making ammonia?
- 1 Nickel
- 2 Platinum
- 3 Iron
- 4 Vanadium pentoxide
جواب دیکھیں
درست جواب: Iron
Finely divided iron is the catalyst in the Haber process. Vanadium pentoxide is used in the Contact process.
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Which reagent distinguishes an aldehyde from a ketone?
- 1 Bromine water
- 2 Tollens' reagent
- 3 Lime water
- 4 Litmus paper
جواب دیکھیں
درست جواب: Tollens' reagent
Aldehydes reduce Tollens' reagent to give a silver mirror. Ketones do not.
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According to Markovnikov's rule, the addition of HBr to propene gives mainly:
- 1 1-bromopropane
- 2 2-bromopropane
- 3 Propane
- 4 1,2-dibromopropane
جواب دیکھیں
درست جواب: 2-bromopropane
The hydrogen goes to the carbon that already has more hydrogens, so bromine ends up on the middle carbon.
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Which type of alkyl halide reacts fastest by the SN1 mechanism?
- 1 Methyl
- 2 Primary
- 3 Secondary
- 4 Tertiary
جواب دیکھیں
درست جواب: Tertiary
A tertiary carbocation is the most stable, so tertiary halides react fastest by SN1.
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What is the product when ethene reacts with steam in the presence of an acid catalyst?
- 1 Ethanal
- 2 Ethane
- 3 Ethanoic acid
- 4 Ethanol
جواب دیکھیں
درست جواب: Ethanol
Acid-catalysed hydration of ethene adds water across the double bond to give ethanol.
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What is the hybridisation of sulphur in SF6?
- 1 sp3
- 2 sp3d
- 3 sp3d2
- 4 sp2
جواب دیکھیں
درست جواب: sp3d2
Six bond pairs need six hybrid orbitals, which use one s, three p and two d orbitals.