Explanation

The equivalent weight of an element is the mass of the element that reacts with one mole of electrons (or one mole of hydrogen atoms).

For aluminum (Al), the equivalent weight is 9 g.

Atomic weight of Al = 27 g/mol

Valency of Al = 3 (since Al forms Al3+ ions)

Equivalent weight = Atomic weight / Valency

= 27 g/mol / 3

= 9 g

So, 1 g equivalent weight of Al is 9 g!

Explanation

• In a NaCl crystal lattice, each sodium (Na+) ion is surrounded by six chlorine (Cl-) ions, forming an octahedral geometry.
• This means that each Na+ ion is coordinated by six Cl- ions, and vice versa.

Explanation

• The empirical formula of hydrogen peroxide (H2O2) is HO.
• The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.
• In this case, the ratio of hydrogen to oxygen is 1:1, which is represented by the formula HO.

Explanation

Given:

- Length of string, L = 30 cm

- In 2nd harmonic, L = 3λ/4

Solving:

30 = (3/4)λ  

⇒ λ = (4 × 30) / 3 = 40 cm

Explanation

Cinnabar is the most common ore of mercury, and its chemical formula is HgS (mercury sulfide).

It has a bright red color and is used to extract mercury.

Explanation

The chemical formula for palmitic acid is C₁₆H₃₂O₂.

It is also known as hexadecanoic acid.

Palmitic acid is a saturated fatty acid, meaning it contains only single bonds between carbon atoms. 

Explanation

With an increase in the number of unpaired electrons, paramagnetism increases. 

Paramagnetism is directly related to the presence of unpaired electrons.

More unpaired electrons mean a stronger magnetic field, hence a greater degree of paramagnetism. 

Explanation

 The enthalpy change during the formation of one mole of a compound from its elements in their standard states is called standard heat of formation. 

Explanation

A mass spectrometer separates ions based on their mass-to-charge ratio (M/E).

Ions with different masses or charges will follow different paths in the magnetic field, allowing separation.

Explanation

• A heterogeneous mixture is a mixture in which the components have different physical properties, such as color, texture, or phase (solid, liquid, or gas).
• In a heterogeneous mixture, the components are not uniformly distributed, and you can often see the individual components.