Potassium | MCQs

Explanation

Potassium permanganate (KMnO₄) gives a pink to purple color when dissolved in water, depending on the concentration.

It is commonly used as a disinfectant and in redox reactions.

Explanation

 When iodine dissolves in water in the presence of KI, it forms the I₃⁻ ion.

Explanation

Explanation

Potassium ferrocyanide ​ [K[Fe(CN) 6] is an example of a complex salt

Because it contains a central metal atom (iron) bonded to ligands (cyanide ions)

Explanation

•  02% of total body potassium is present in the extracellular fluid of a person
  

Explanation

Potassium hydroxide (KOH) is used to make soft soaps, which are typically more soluble and have a lower melting point than soaps made with sodium hydroxide (NaOH).

Soft soaps are often used in liquid soaps, shampoos, and body washes.

Explanation

A normal potassium level for adults is between 3.5 and 5.5 millimoles per liter (mmol/L).

Potassium level is high (also called hyperkalemia) when it goes above 5.5 mmol/L.

Explanation

Banana

Bananas are known to be a good source of potassium. In fact, one banana contains 451 mg of potassium (43). This delicious fruit is also rich in Vitamin C, Vitamin B6, Magnesium, Fiber and Antioxidants (44).

Explanation

Lattice energy is calculated using the Born-Haber cycle, considering the heat of sublimation, dissociation, ionization, electron affinity, and heat of formation.

After applying the Born-Haber cycle, the lattice energy of KBr is -679.3 kJ/mol.

Explanation

During the non-conducting state, the neuron membrane is permeable to the efflux of K⁺ (potassium ions).

This outward movement of potassium helps maintain the resting membrane potential by keeping the inside of the neuron negatively charged compared to the outside.