TET-Ctet-Chemistry-set-27

Chemistry MCQs for all Competitive Exams SET-27
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-27
रसायन विज्ञान बहुविकल्पीय प्रश्न


Question : 1-10

Question : 1

For alkali metals, which one of the following trends is INCORRECT?

[A].   Ionization energy: Li > Na > K > Rb
[B].   Hydration energy: Li > Na > K > Rb
[C].   Atomic size: Li < Na < K < Rb
[D].   Density: Li < Na < K < Rb


Question : 2

During the formation of a chemical bond

[A].   Energy decreases
[B].   Energy increases
[C].   Energy of the system does not change
[D].   Electron-electron repulsion becomes more than the nucleus-electron attraction


Question : 3

Ellingham diagram represents a graph of

[A].   DG Vs T
[B].   DG0 Vs T
[C].   DS Vs P
[D].   DG Vs P


Question : 4

For the decomposition of a compound AB at 600 K, the following data were obtained:

[AB] mol dm-3 Rate of decomposition of AB in mol dm–3s–1
0.20 2.75 × 10–8
0.40 11.0 × 10–8
0.60 24.75 × 10–8

The order for the decomposition of AB is

[A].   1
[B].   2
[C].   1.5
[D].   0


Question : 5

Enthalpy change for the reaction, 4H(g) → 2H2(g) is –869.6 kJ. The dissociation energy of H – H bond is

[A].   +217.4 kJ
[B].   –434.8 kJ
[C].   –869.6 kJ
[D].   +434.8 kJ


Question : 6

For the four successive transition elements (Cr,Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

[A].   Cr > Mn > Co > Fe
[B].   Mn > Fe > Cr > Co
[C].   Fe > Mn > Co > Cr
[D].   Co > Mn > Fe > Cr


Question : 7

Enthalpy change for the reaction, 4H(g) → 2H2(g) is –869.6 kJ. The dissociation energy of H – H bond is

[A].   +217.4 kJ
[B].   –434.8 kJ
[C].   –869.6 kJ
[D].   +434.8 kJ


Question : 8

Entropy of the universe is

[A].   Continuously increasing
[B].   Continuously decreasing
[C].   Zero
[D].   Constant


Question : 9

For the reaction 2HI(g) ⇌ H2(g) + I2(g) – Q KJ , the equilibrium constant depends upon

[A].   Temperature
[B].   Pressure
[C].   Catalyst
[D].   Volume


Question : 10

Enthalpy of vapourization of benzene is +35.3 kJ mol–1 at its boiling point of80°C. The entropy change in the transition of the vapour to liquid at its boiling point[in JK–1 mol–1] is ______.

[A].   -100
[B].   -441
[C].   +100
[D].   +441





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