It shows greater difference in standard reduction potential values

5) None of these

 

Задание #116

Вопрос : Use the activity series given to you to determine which of the following reactions will NOT take place:

1) Zn + NiCl₂ =>

2) Fe + CuSO₄ =>

3) K + H₂O =>

4) Al + Cr₂O₃ =>

5) Au + HNO_{3 (conc)} = >

 

Задание #117

Вопрос : An aqueous solution of K₂SO₄ is electrolysed using platinum electrodes. The products at the anode and the cathode are:

1) SO₄^-2, H₂

2) O₂, H₂

3) KOH, H₂SO₄

4) O₂, K

5) SO₄^2-, К

 

Задание #118

Вопрос : What are metals that can be beaten into various shapes called?

1) Beatable Metals

2) Polymer Metals

3) Malleable Metals

4) Shiny Metals

5) Ductile Metals

 

Задание #119

Вопрос : Determine the standard EMF of the cell :

1) +1,60В              

2)  +3,12В             

3) -1,60В             

4)  -3,12В             

5) -2,36В

 

Задание #120

Вопрос : Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution had changed. Which solution was in the test tube?

1) Na₂SO₄

2) Al₂(SO₄)₃

3) MgSO₄

4) ZnSO₄

5) CuSO₄

 

Задание #121

Вопрос : Which of the following reactions involve NEITHER oxidation nor reduction?

1) reaction of potassium hydroxide with nitric acid

2) displacement reaction of iron in copper sulfate

3) burning antimony in chlorine

4) decomposition of potassium chlorate

5) reaction of sodium with water

 

Задание #122

Вопрос : What are metals that can be stretched easily known as?

1) Polymer Metals

2) Shiny Metals

3) Malleable Metals

4) Ductile Metals

5) Stretchable Metals

 

Задание #123

Вопрос : What is the oxidation state (OS) of the central metal atom and the coordination number (CN) in the complex Co(NH₃)₅ Cl Cl ? Name it

1) OS = +3, CN = 7. Pentaaminodichloridocobalt (III)

2) OS = +3, CN = 6. Pentaaminochloridocobalt (III) chloride

3) OS = +2, CN = 16. Pentaaminochloridocobaltat (II) chloride

4) OS = +2, CN = 6. Pentaaminochloridocobalt (II) chloride

5) OS = +1, CN = 16. Pentaaminochloridocobalt (I) chloride

6) OS = +2, CN = 5. Pentaaminochloridocobaltat (II) chloride

 

Задание #124

Вопрос : Which metal is common between brass, bronze and German silver?

1) Ti      2) Mg   3) Cu    4) Al  5) Zn

 

Задание #125

Вопрос : Determine the standard EMF of the cell :

1) +0,74V       2) +0,55V       3) +0,19V      4) +0,93V      5) -0,93V

 

Задание #126

Вопрос : The neutral moleculas or negative ions bound to the central metal or ion in the coordination sphere called:

1) cation

2) ligands

3) complex ion

4) central atom

5) anion

 

Задание #127

Вопрос : …………….. is the most reactive metal.

1) Co     2) Mg       3) Pt       4) Ni       5) Fe

 

Задание #128

Вопрос : In which among the following are the noble metals soluble?

1) HCl

2) H₂SO₄

3) Aqua regia

4) NH₄OH

5) Water gas

 

Задание #129

Вопрос : What happens when NH₄OH is added to a solution of copper sulphate?

1) A deep blue solution of copper^,s ammine complex is obtained

2) A deep blue solution is obtained

3) No change is observed

4) Blue precipitate of copper hydroxide is obtained

5) Black precipitate of copper oxide is obtained

 

Задание #130

Вопрос : Using IUPAC norms write the formula for the following: Hexaamminecobalt(III) sulphate

1) [Co(NH₃)₆ (SO₄)₃]

2) [Co(H₂O)₆]₂ (SO₄)₃

3) [Co(NH₃)₆] SO₄

4) [Co(NH₃)₆]₂ (SO₄)₃

5) [Co(NH₂)₆]₂ (SO₄)₃

 

Задание #131

Вопрос : Which of the following acids form three series of salts?

1) H₃PO₄

2) HPO₃

3) H₃PO₂

4) H₃BO₃

5) H₃PO₂

 

Задание #132

Вопрос : Metal corrosion is ....

1) the formation of insoluble metal salt in the electrolyte solution

2) a conversion of chemical energy into electrical energy

3) a dissolution of metal in water

4) a dissolution of metal in acid

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