Chemistry - Study Mode

[#96] The chemical bahaviour of an atom depends upon
Correct Answer

(C) The number of electrons orbiting around the nucleus

Explanation

Solution: The chemical behavior of atoms is determined by the number and the configuration of the electrons in the atom.

[#97] Which one of the following has a maximum tendency to form M 3 ion ?
Correct Answer

(A) N

Explanation

Solution: The general electronic configuration of group 15 elements (N, P, As, Sb and Bi) is ns 2 np 3 . Since Nitrogen has smallest size and greatest electronegativity in the family, it may gain three electrons and attain noble gas configuration, forming nitride N 3- ions. The other members show little tendency to form tri-negative M 3- ions. Their electronegativity is so low that they would generally form covalent compounds even with highly electropositive elements.

[#98] A matured mammalian cell without nucleus is
Correct Answer

(B) Erythrocyte

Explanation

Solution: Mammalian erythrocytes are unique among the vertebrates as they are non-nucleated cells in their mature form. These cells have nuclei during early phases of erythropoiesis, but extrude them during development as they mature in order to provide more space for hemoglobin. In mammals, erythrocytes also lose all other cellular organelles such as their mitochondria, Golgi apparatus and endoplasmic reticulum.

[#99] Which of the following metals can displace copper from copper sulphate solution ?
Correct Answer

(C) Iron

Explanation

Solution: Iron metal is more reactive than copper. Therefore, it can displace copper from copper sulphate (CuSO 4 ) solution. Cu is less reactive than iron, therefore, cannot replace iron from iron sulphate (FeSO 4 ).

[#100] The heat value of combustion of Gasoline is
Correct Answer

(D) 47000 kJ/kg

Explanation

Solution: The heat value of combustion of Gasoline is 47000 kJ/kg.