(b) Iron is a transition element.(i) Which two of the following statements about iron are correct?Tick two boxes. A freshly-cut surface of iron is green in colour.Iron exists in only one oxidation state in its compounds.Iron has a high density.Iron has a giant covalent structure.Iron ...
II . Decide which of the following sentences in each group is right. You should mark "√" in the brackets before the right sentence, and "X" otherwise.1.我家里有五口人。() There are five people in my family.()There are five people in my families.2.这个盆子是铁做的。( ) This ...
The synthesis and crystal chemistry of FeL32ClO421; L32,6-di3-hydroxymethylpyrazol-1-ylpyridine is described. This compound crystallises as a mixture of three different phases from MeCNEt2O: two solvent-free polymorphs, termed α-1space groupP2cand β-1P21c; and, a solvate of approximate ...
Which of the following substances is the best reducing agent? Briefly explain. a) Ag b) Zn c) Li^+ d) Ag^+ e) Al Explain why heats of hydrogenation cannot be used to determine the relative stability of 2-methylpent-2-ene and 3-...
Knowledge Check Which of the following is/are Doeberiners triad (i) P, As, Sb (ii) Cu, Ag, Au (iii) Fe, Co, Ni (iv) S, Se, Te Correct answer is A(i) and (ii) B(ii) and (iii) C(i) and (iv) DAllSubmit
To determine in which of the given processes colloidal sulfur is formed, we will analyze each reaction step by step. Step 1: Analyze the first reaction Reaction:FeCl2 + H2S → FeS + 2HCl - In this reaction, iron(II) chloride reacts with hydrogen sulfide to form iron(II) sulfide and hyd...
Which of the following is (are) formed by ozonolysis of the compound below? a) Only I b) Only II c) Only I and II d) I, II, III Ozonolysis: In ozonolysis, the double bonds are cleaved to form C=O bonds. Each double-bonded ...
(b)Iron reacts with hydrochloric acid to form iron(II) chloride and a gas which 'pops' with a lighted splint.(i) Identify this gas.[1] (ii) Suggest a practical method for investigating the rate of this reaction involving collection of the gas.You may include a labelled diagram in you...
【3】Which of the following is mentioned in the text? A. Fridges will know what people need. B. Jacket sleeves can be used as a guide. C. Cars will be able to drive automatically. D. Nothing can replace the Internet. 【4】What is the text mainly about? A. Future technology in eve...
This is the first time that this structural distortion has been observed in an iron(II) complex of a 2,6-di(pyrazol-1-yl)pyrazine derivative. In contrast 1[ SbF 6] 2 · 3CH 3NO 2 is low-spin at room temperature and has a regular six-coordinate geometry....