پرسیاری وزاری کیمیا 2022-2023 خولی یەکەم ، خوێندنی ئینگلیزی
تاقیکردنەوەی پرسیاری وزاری کیمیا 2022-2023 خولی یەکەم ، خوێندنی ئینگلیزی
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- Question 1 of 50
1. Question
0.25kj of energy is added to 10g of a material, the temperature changed 50K, the specific heat
- Question 2 of 50
2. Question
When 25.0 mL of 5×10-5M Pb(NO3)2 is combined with 25.0 mL of 4×10-5M Na2SO4 , which of the
following is net ionic equation through Ksp calculation : Ksp for PbSO4 =1.6×10-8 - Question 3 of 50
3. Question
One of the following is a type of substitution reaction
- Question 4 of 50
4. Question
Hydrogen combines vigorously with chlorine, but it reacts weakly with nitrogen , under the same condition, the factor affecting the rate of reaction is
- Question 5 of 50
5. Question
Br2 is oxidizing agent, displaces…………ions
- Question 6 of 50
6. Question
The molecular formula for 3-ethyl-4-methylhexane is
- Question 7 of 50
7. Question
: A reaction has ΔG= -834.3kj/mol and ΔS= – 38.5kj/mol ,ΔH for the reaction at 448K is equal
- Question 8 of 50
8. Question
Is an ion that does not act as a Bronsted-Lowry acid
- Question 9 of 50
9. Question
The name of this compound: (CH3-CH2-NH-CH3) is
- Question 10 of 50
10. Question
? Which of the following solutions has the highest osmotic pressure
- Question 11 of 50
11. Question
In this reaction
NH3(g)+H2O(I)⇔NH4+(aq)+OH–(aq)
? which of the following is correct
- Question 12 of 50
12. Question
In the following gaseous equilibrium system: 2SO2+O2 ⇔2SO3 +energy , which of the
following changes are increase amount of SO3? - Question 13 of 50
13. Question
In which of the following containers, can a solution of Sn(NO3)2 be stored? if the standard
reduction potential for each Sn2+,Zn2+,Al3+,Cu2+,Ni2+ respectively is equal
to ( -0.14, -0.76, -1.66, 0.34,-0.23 ) volt? - Question 14 of 50
14. Question
The boiling point of an aqueous solution of glucose is100.102oc , the expected boiling point for
which of the following solutions is 100.1036oc, with the same concentration? Kb=0.51oC/m - Question 15 of 50
15. Question
Is a poly atomic ion, the oxidation number of sulfur is +4
- Question 16 of 50
16. Question
?Which of the following is a monomer of natural rubber
- Question 17 of 50
17. Question
The overall electrochemical reaction that occurs spontaneously for a cell consisting of the half-cell: MnO2/Mn2+and Cr3+/Cr is: (E0 reduce Cr3+/Cr = – 0.74V, E0reduce MnO2/Mn2+=1.22V)
- Question 18 of 50
18. Question
Is a compound that does not ionize in water
- Question 19 of 50
19. Question
In this reaction
2Fe2O3(s)+3C(s) +467.9kJ→ 4Fe(s) + 3CO2(g)
calculate the standard enthalpy of formation for Fe2O3
if the standard enthalpy of formation for CO2 is -393.5kj/mol
- Question 20 of 50
20. Question
The following half-reaction:
( O2(g) + 4e–+ 2H2O(I)→ 4OH–(aq) )
occurs at cathode of
- Question 21 of 50
21. Question
Lewis acid is an atom, ion, or molecule form a covalent bond by
- Question 22 of 50
22. Question
By using a catalyst in a reaction the forward activation energy is decreased by an amount,
which of the following is correct - Question 23 of 50
23. Question
It is used in biology laboratories as a preservative for dead animals
- Question 24 of 50
24. Question
When an aqueous solutions of barium chloride and potassium sulphide combined, which of the
? following ions do not appear in the net ionic equation - Question 25 of 50
25. Question
? Which of the following compounds is a structural isomers of pentane according IUPAC system
- Question 26 of 50
26. Question
The boiling point of ethanol is lower than the boiling point of
- Question 27 of 50
27. Question
When a quantity of Al2(SO4)3 is dissolved in water, 0.4 mole of aluminium ions are formed, how
? many moles of aluminium sulfate are dissolved - Question 28 of 50
28. Question
The anode electrode in a car battery is
- Question 29 of 50
29. Question
An allotrope of carbon is a soft, black and conductor of electricity
- Question 30 of 50
30. Question
One of the following compounds is not very soluble in water, it cannot produce strongly alkaline
solution - Question 31 of 50
31. Question
Is a process deposits metal onto a surface
- Question 32 of 50
32. Question
When a zinc strip is in contact with a copper (II) sulfate solution
- Question 33 of 50
33. Question
? Which of the following statements is true for dissolving KNO3 in water
- Question 34 of 50
34. Question
The following reaction: A + 2B →C , is found to occur in the
one – step mechanism, by using the data in the adjacent table
the rate of the reaction in the second experiment is
- Question 35 of 50
35. Question
In a reversible reaction, when the activation energy for exothermic change with activation
energy for endothermic change is compare, which of the following is correct - Question 36 of 50
36. Question
?Which of the following solutions has highest pOH value with the same concentration
- Question 37 of 50
37. Question
In this reaction: NO2+CO→NO+CO2 , if the reaction of fast step is: NO3+CO→NO2+CO2 by
what factor does the rate increase if [CO] doubled? - Question 38 of 50
38. Question
In which of the following reaction the ΔHƒo
value of product is equal to ΔHo of reaction - Question 39 of 50
39. Question
The pH of Ca(OH)2 solution is 9.3, what is the concentration of Ca(OH)2 solution?
- Question 40 of 50
40. Question
: Neutralization is
- Question 41 of 50
41. Question
This reaction
Cl2+2Fe+2(aq) → 2Fe+3(aq)+2Cl–(aq)
- Question 42 of 50
42. Question
The volume of 0.2M of sulfuric acid is required to titrate with 0.5 mol of sodium hydroxide is
- Question 43 of 50
43. Question
By adding KCN to HCN solution
- Question 44 of 50
44. Question
The following reaction
2Pb(NO3)2→ 2PbO+4NO2+O2 is
- Question 45 of 50
45. Question
When a reaction is endothermic and leads to decrease randomness, the reaction is
- Question 46 of 50
46. Question
The aqueous solution of NH4CH3COO is neutral because
- Question 47 of 50
47. Question
The hybridization type of cycloalkane is
- Question 48 of 50
48. Question
The suitable indicator for titration potassium hydroxide with ethanoic acid is
- Question 49 of 50
49. Question
For the following gaseous reaction: 2HI⇔H2+I2
at equilibrium it is found that [HI]=0.24M ,[H2]=[I2]=0.12M , the equilibrium constant for the reverse reaction is equal:
- Question 50 of 50
50. Question
? Which of the following compound may be alkyne