TET-Ctet-Chemistry-set-46

Chemistry MCQs for all Competitive Exams SET-41
Chemistry Multiple Choice Questions

Chemistry Multiple Choice Questions(MCQ)
रसायन विज्ञान बहुविकल्पीय प्रश्न

Welcome to our exclusive collections of chemistry multiple choice questions with answers. All questions are of multiple choice type.In these MCQs sets we are going to share most important questions related to chemistry. These questions are very helpful for those candidates and aspirants who are preparing for the various government and non government exam as well as in interview.
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Chemistry MCQs for all Competitive Exams SET-41
रसायन विज्ञान बहुविकल्पीय प्रश्न


Question : 1-10

Question : 1

Carbon cannot reduce Fe2O3 to Fe at a temperature below 983 K because ______.

[A].   CO is thermodynamically more stable then Fe2O3
[B].   free energy change for the formation of CO is more negative then that of Fe2O3
[C].   iron has higher affinity towards oxygen then carbon
[D].   carbon has higher affinity towards oxygen then iron


Question : 2

50 cm3 of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration was discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is

[A].   12 cm3
[B].   10 cm3
[C].   21.0 cm3
[D].   16.2 cm3


Question : 3

Chemical reactions with very high Ea values are generally

[A].   very fast
[B].   very slow
[C].   moderately fast
[D].   spontaneous


Question : 4

9.65 coulombs of electric current is passed through fused anhydrous MgCl2. The magnesium metal thus obtained is completely converted into a Grignard reagent. The number of moles of Grignard reagent obtained is

[A].   1 × 10–4
[B].   5 × 10–4
[C].   1 × 10–5
[D].   5 × 10–5


Question : 5

Decreasing order of reactivity of hydrogen halide acids in the conversion of ROH → RX is

[A].   HCI > HBr > HI > HF
[B].   HI > HBr > HCI > HF
[C].   HF > HCI> HBr > HI
[D].   HF > HBr > HI > HCI


Question : 6

A buffer solution contains 0.1 mole of sodium acetate dissolved in 1000 cm3 of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is ______.

[A].   pKa + 1
[B].   pKa
[C].   pKa + Log 2
[D].   pKa = Log 2


Question : 7

During the adsorption of Krypton on activated charcoal at low temperature; ______.

[A].   ΔH > 0 and ΔS < 0
[B].   ΔH < 0 and ΔS < 0
[C].   ΔH < 0 and ΔS > 0
[D].   ΔH > 0 and ΔS > 0


Question : 8

A chemical reaction proceeds into the following stepsStep I, 2A Ý X fastStep II, X + B Ý  Y slowStep III, Y + B Ý Product fastThe rate law for the overall reaction is

[A].   Rate = k[A]2
[B].   Rate = k[B]2
[C].   Rate = k[A][B]
[D].   Rate = k[A]2[B]


Question : 9

During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into

[A].   NaNO2
[B].   NaNH2
[C].   NaCN
[D].   NaNC


Question : 10

A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is[Atomic mass of Ca = 40]

[A].   75
[B].   31.5
[C].   40.2
[D].   25





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