Correct Answer: B. mundane

Explanation

The word 'stellar' refers to something outstanding or exceptional. The opposite of 'stellar' would be something ordinary or common, hence the word 'mundane' is the correct answer.

Correct Answer: B)

Cu(NH\(_3\))4Cl\(_2\)

Explanation

A complex salt is a compound that contains a central metal atom or ion bonded to one or more molecules or ions. These molecules or ions are called ligands, and they can be neutral or charged. Complex salts are typically characterized by their formation of coordination complexes, where the ligands donate electron pairs to the metal ion, forming coordinate covalent bonds.

In the given options, Option B: Cu(NH\(_3\))4Cl\(_2\) is a complex salt. In this compound, the central metal ion is copper (Cu) surrounded by four ammonia (NH\(_3\)) ligands. The ammonia molecules act as ligands, donating their electron pairs to the copper ion, forming coordinate covalent bonds. The chloride ions (Cl\(_2\)) are the counterions that balance the charge in the complex.

Option A: KAl(SO\(_4\))\(_2\).12H\(_2\)O is an example of a double salt, not a complex salt. Option C: K\(_2\)S\(_2\)O\(_3\).5H\(_2\)O is a hydrated salt, and Option D: Mg(OH)Cl is a simple ionic compound. None of these options involve the formation of coordination complexes, so they cannot be considered complex salts.

Correct Answer: C. Ruku

Correct Answer: A. 180°

Explanation

a + c + d - 180^o[sum of angles in triangle]

x = a[vertical opp. ?s]

y + x + d = 180^o[sum of ?s in a ?]

y + a + d = 180^o

y + a + d = a + c + d

y = c

but b + y = 180^o [sum of ?s on a straight line ]

b + c = 180^o; Ans = A = 180^o

Correct Answer: D. Pluto

Correct Answer: A. heterotrophic

Explanation

Heterotrophic nutrition is a type of nutrition in which an organism obtains its food by consuming organic matter from other organisms. In the case of pitcher plants, they capture and digest insects as a source of nutrients to supplement their diet, especially in nutrient-poor environments. This carnivorous adaptation is a specialized form of heterotrophic nutrition, as the pitcher plant relies on consuming other living organisms (insects) to meet its nutritional needs. The pitcher plant is a carnivorous plant that has modified leaves forming pitcher-like structures.

Correct Answer: C. Casely Hayford

Correct Answer: A. meandered

Correct Answer: C. Arachnida

Correct Answer: A. optimistic