BITSAT Chemistry Test - 8 - JEE MCQ

Smog is the combination term for smoke and fog and it is formed when smoke is present along with fog in the environment.

Light oil obtained from fractional distillation of petroleum contains 5-8% of benzene.

Mixed halides of flourine and chlorine are easily liquifible gases having low boiling point and low specific heats.

A neutral atom whose atomic number (Z) is greater than one, contains protons, electrons and also neutrons equal to difference of atomic mass and atomic number (Z).

Higher the negative charges, higher will be the size of the ion. Also, negative ion (anion) is always bigger than the cation or neutral atom counter part.

Diamond is the hardest natural substance known so it is used for glass cutting purposes.

The process of coating a metal with a corrosion resistant metal by electrolysis is called as electroplating. It was first discovered by Faraday.

Boron or cadmium rods, are used as control rods. These rods absorb neutrons and thereby control the rate of fission.

Milk is an emulsion of fat particles dispersed in water. Emulsions are the dispersions of one liquid in the other when two immiscible or partly miscible liquids is shaken.

Most of the medicines in use are colloidal in nature. For example, Colloidal antimony is used in curing kala- azar. Colloidal medicines are more effective because they are easily assimilated and absorbed.

Hydrogen cyanide reacts with aldehyde to produce cyanohydrin. Ammonia acts as a nucleophile and substitutes hydroxyl group. Hydrolysis of cyanide group will convert into carboxylic acid group. It is known as Strecker synthesis.

(i) Glycosidic linkage: The two monosaccharide units are joined together through an ether linkage formed by loss of a molecule of H₂O. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage.
(ii) Peptide linkage: The carboxyl group of one amino acid and amino group of another amino acid gets condensed with the elimination of water molecule. The resulting −CO−NH− linkage is called a peptide bond.

Sodium amalgam, commonly represented as Na/Hg is an alloy of mercury and sodium.
Na/Hg is strong reducing agent, which reduces carbonyl compound to alcohols by electron transfer mechanism. During reduction of glucose, only more reactive - CHO group is reduced, while rest of the molecule remains same.

STATEMENT-1 is True because Sucrose upon hydrolysis gives unequal amounts of glucose and fructose.
STATEMENT-2 is True;
STATEMENT-2 is Not a Correct explanation for STATEMENT-1

Chlorine bleaching action is through
(i) Process of oxidation in prejence of water Cl₂+H₂O→HOCl+HCl
(ii) Depends upon the stability of conjugate base:ClO₄⁻>BrO₄⁻>IO₄⁻
(iii) Increase in dipole moment (μ=q×d)
Increase in bond length M - F
Increase in size of M

N₂ (g) and O₂ (g) react under electric arc at 200°C to form NO(g). Both the assertion and reason are correct, and reason is the correct explanation.

Inert pair effect is the inertness of the ns electrons due to the poor shielding effect of the 4f sub-shell. As the result, for the downward elements of the p - block elements, the lower oxidation state is more stable than their respective higher oxidation state.
Due to the inert pair effect,
Tl⁺³→Tl⁺, stable
Pb⁺⁴→Pb⁺², stable
In PbO₂, is in +4 oxidation state, which can be reduced to +2 oxidation state.

Electronic configuration of  C and Si are as follows-
C=2s² 2p²
Si=3s² 3p²
Carbon has no d - orbital to expand but Si has vacant d- orbitals and it can expand its valency using these vacant d - orbitals and forms compounds like SiF₆ ^2- with covalency of Si = 6.

Out of the group 14 elements, C and Ge do not react with water and lead is also unaffected because of the protective oxide film formation.
Sn reacts with steam to form SnO₂ and H₂.
Sn+2H₂O⟶SnO₂+2H₂
Answer will be Sn.

An improved combination of baking power contains about 40% starch, 30% NaHCO₃, 20% NaAl(SO₄)₂ and 10% Ca (H₂PO₄)₂ Here starch acts as filler.

“α” and “β” cyclic hemiacetals of D-glucose having difference in configuration at C- l only are called anomers.

C1 of β − D - galactose and C4 of β - D - glucose linkage exist between galactose and glucose unit of lactose. It is also called milk sugar. This linkage is also called β - glycosidic linkage.

Ethyl acetoacetate exist in two forms.

Enolic form is more volatile due to intra-molecular hydrogen bonding (chelation).

Hence, this is the correct option.

For an ideal gas, the work of reversible expansion under isothermal conditions can be calculated by using the expansion w = -nRT ln 

In isothermal expansion, ∆U = 0

In the presence of a strong field ligand, d⁴ configuration for octahedral complex is 
Orbital electronic distribution can be given as follows:

Hence, the metal ion has two unpaired electrons and it is paramagnetic in nature.

Vibrational degree of freedom per mole of CO₂ (polyatomic linear) = 3n - 5 = 3 × 3 - 5 = 4
Vibrational degree of freedom per mole of SO₂ (polyatomic non-linear) = 3n - 6 = 3 × 3 - 6 = 3
Difference in vibrational kinetic energies =