FreeNotes
A non-spontaneous reaction is one that does not occur naturally under standard conditions, meaning it requires an input of external energy to proceed. This is where electrolysis comes into play, allowing non-spontaneous reactions to occur by supplying electrical energy. Electrolysis is a process in which electrical energy is used to drive a chemical reaction that … Read more
(a) Na₂SO₄ (S) Sodium (Na) has an oxidation state of +1 (since it’s a Group 1 element). Oxygen (O) has an oxidation state of -2. Let the oxidation state of sulfur (S) be xxx. The sum of the oxidation states in a neutral compound is zero: 2(+1)+x+4(−2)=0 2+x−8=0 x=+6 So, sulfur has an oxidation state … Read more
The oxidation state (also known as oxidation number) is a concept that helps chemists determine the electron distribution in a molecule or ion. There are several rules to assign oxidation states to elements in different compounds or ions. Here are the key rules: Oxidation state of an element in its free (uncombined) state is zero: … Read more
In the electroplating of chromium, the anode is typically made of chromium metal. This allows the chromium to dissolve into the electrolyte as chromium ions, which are then reduced and deposited onto the cathode. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is formed when HCl … Read more
In silver electroplating, silver ions (Ag⁺) come from a solution of silver nitrate (AgNO₃) or silver cyanide. These ions are reduced at the cathode and deposit as solid silver on the surface to be plated. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is formed when … Read more
The redox reaction in chromium electroplating involves the reduction of chromium ions at the cathode and the oxidation of the anode. The reaction at the cathode is:Cr3++3e−→Cr0This results in the deposition of chromium metal on the surface. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is … Read more
In electroplating of chromium, the electrolyte commonly used is chromium(III) sulfate (Cr2(SO4)3\text{Cr}_2\text{(SO}_4)_3Cr2(SO4)3) or chromium(III) chloride (CrCl3\text{CrCl}_3CrCl3). Related Questions: How is electroplating of tin on steel carried out? Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is formed when HCl reacts with BaCO₃? How will you justify that H₂SO₄ … Read more
Oxygen is necessary for rusting because it reacts with iron to form iron oxide (rust). The reaction requires both oxygen and water, where oxygen in the air reacts with iron in the presence of moisture to create rust. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt … Read more
An iron grill is painted frequently to protect it from rusting. The paint acts as a protective layer, preventing oxygen and water from coming into contact with the iron, thus reducing the chances of oxidation and corrosion. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is … Read more
Galvanizing is done to protect steel and iron from corrosion by coating them with a layer of zinc. Zinc acts as a sacrificial anode, corroding instead of the underlying metal, thus extending the life of the material. Related Questions: Choose Arrhenius acids from the following compounds: HF, NH₃, H₂SO₄, SO₂, H₂S, H₂O Which salt is … Read more