In the electrochemical series, metals with a negative standard reduction potential are more reactive than hydrogen. Tin (Sn) has a standard reduction potential of approximately -0.14 V, placing it above hydrogen (0.00 V), whereas mercury, copper, and silver have positive reduction potentials, making them less reactive than hydrogen.

According to the reactivity series of metals, zinc is more reactive than copper. Therefore, copper cannot displace zinc from its salt solution. Consequently, no chemical reaction occurs when copper is immersed in a zinc sulphate solution.

Platinum is a noble metal, meaning it is highly resistant to oxidation and corrosion. Unlike reactive metals such as magnesium, iron, or calcium, which readily react with oxygen or moisture to form oxides or hydroxides, platinum remains stable and lustrous even when exposed to harsh environmental conditions, making it ideal for jewelry and industrial catalysts.

In electroplating, a metal with a lower reduction potential (more active) is typically deposited onto a metal with a higher reduction potential (less active). Since gold has a much higher standard reduction potential than iron, gold ions in solution would spontaneously oxidize iron, preventing the stable deposition of iron onto the gold surface. The electrochemical potential difference makes the desired plating reaction non-spontaneous under standard conditions.

Copper has a positive standard reduction potential and cannot displace hydrogen from HCl, making statement A false. Statement R is true because hydrogen is indeed above copper in the reactivity series, meaning hydrogen is more easily reduced than copper ions.

This is a single displacement reaction. Because zinc is more reactive than copper in the electrochemical series, it displaces copper from the copper sulfate solution, resulting in the formation of zinc sulfate and solid copper metal.

Alkali المعادن هي مجموعة من العناصر التي تتميز بقدرة عالية على التفاعل بسبب وجود إلكترون واحد على مستوى الطاقة الخارجي. In this case, Radium is not considered an alkali معدن because it is not a typical element with such properties. Unlike Francium, Caesium, and Rubidium, Radium belongs to the Actinide series rather than the Alkali المعادن series.

Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.

In a homologous series, each member differs by a CH2 unit, which has a mass of 14 amu.

An electrochemical series is a list of elements arranged in order of their standard electrode potentials, which is a measure of an element's ability to lose or gain electrons.