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Chemistry - Chemical Reactions and Equations

Avatto > > NTSE > > Practice Questions Ntse > > Chemistry > > Chemical Reactions and Equations

51. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? (NTSE Chandigarh, Stage-I, 2014-15)

A
KMn0₄ is an oxidizing agent and it oxidizes FeS0₄
B
FeS0₄ acts as an oxidizing agent and it oxidizes KMn0₄
C
The colour disappears due to dilution: noreaction is involved
D
KMn0₄ is an unstable compound and it decomposes in presence of FeS0₄ to a colourless compound

Answer
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Option : A
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52. Fe20₃ + 2AI→A1₂0₃ + 2Fe, this reaction is an example of a;(NTSE Uttar Pradesh, Stage-I, 2015-16) (NTSE Chhattisgarh, Stage-I, 2016-17)

A
Combination reaction
B
Double displacement reaction
C
Decomposition reaction
D
Displacement reaction

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Option : D
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53. Which one is a redox reaction? (NTSE West Bengal, Stage-I, 2015-16)

A
HCI + AgN0₃ → AgCI + HN0₃
B
NaBr + HCI → NaCI + HBr
C
Nap + H2S04 → Na2S04 + Hp
D
H₂ + Br₂ → 2HBr

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Option : D
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54. Identify the correct oxidant and reductant in the following reaction

PbS + 4HP₂ → PbS0₄ + 4H₂0 (NTSE Delhi, Stage-I, 2015-16)

A
PbS - Oxidant H₂O₂ - Reductant
B
PbS - Reductant PbS0₄ - Oxidant
C
PbS - Reductant H₂0 ₂ - Oxidant
D
PbS - Reductant H₂0 - Reductant

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Option : C
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55. After white washing the shining finish given to the walls is due to the formation of (NTSE Karnataka, Stage-I, 2015-16)

A
Calcium oxide
B
Calcium carbonate
C
Calcium hydroxide
D
Carbon-di-oxide

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Option : B
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Practice Questions Ntse

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