Bihar STET Paper 2 Chemistry Mock Test - 5 - Bihar PGT/TGT/PRT MCQ

(II) is most reactive as it forms aromatic carbocation (III) is next most reactive as it forms allylic carbocation. (I) is least reactive as it forms least stable cyclopropyl carbocation.

Wolff-Kishner reduction is suitable for reduction of carbonyls containing olefinic bonds. If Clemmensen reduction is done, HCI also attacks olefinic bonds.

Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling. The lime scale can build up on the inside of the pipe restricting the flow of water or causing a blockage.

• Crystalline solids are anisotropic in nature, that is, some of their physical properties like electrical resistance or refractive index show different values when measured along with different directions in the same crystals.
• This arises from different arrangements of particles in different directions.

(b) Unit cell of fee is divided into eight small cubes. Each cube has four atoms at alternate positions. When joined to each other, they make a regular tetrahedron.
Thus, number of tetrahedral void in small cube = 1 and in eight cubes, voids = 8.

Note  If number of atoms in a cube = N, then, number of octahedral voids = N and number of tetrahedral voids = 2N

(d) PI₃ does not form di iodide with vicinal diols.

The correct answer is Option A.

Aloxy mercuration - demercuration brings about Markownikoff’s addition of alcohols at   without any rearrangement.

The electron has minimum energy in the first orbit and its energy increases as n increases. Here n represents number of orbit, i.e. 1st, 2nd, 3rd .... The third line from the red end corresponds to yellow region i.e. 5. In order to obtain less energy electron tends to come in 1st or 2nd orbit. So jump may be involved either 5 → 1 or 5 → 2.

The correct answer is option A
Nucleotides are joined together by phosphodiester linkage between 5′ and 3′ carbon atoms of pentose sugar.
 

The physical properties of isotopes of the same element are not identical because the atomic mass and mass number differ. This affects physical properties such as density and temperature of change of state, eg. boiling and melting point.

Let, oxidation number of Fe = x

Langmuir isotherm assume monolayer formation only.

Energy of ethene =x₁
Number of ethene in benzene=3.
Therefore, Observed energy of hydrogenation of benzene =3x₁
Calculated energy of hydrogenation of benzene =x₂ (Given)
Therefore, 
Resonance energy = observed - calculated =3x₁−x₂

According to the given sets of options, only option d is correct. The reason or exceptional configuration of Cr is stability of half-filled d subshell. If the Aufbau principle was not followed then the configuration of Cr be [Ar] 3d6. So, if the Aufbau principle won’t be followed, then the options won’t have an electron in their 4s subshell.
 

isoelectronic species will generally have identical bond order:

For this, we will add combustion reactions of both CO and H₂ as both combined will give us energy.
Δ_rH = -283 kJ+ (-242 kJ) = -525 kJ

The colloidal dispersion of a liquid in a liquid is called emulsion.
In these systems, one liquid is dispersed in another  liquid immiscible with it.
For example, milk is an emulsion of oil in water. The particles of liquid fat are dispersed in water.
Cod Liver oil is an emulsion of water in oil. consists of particles of water dispersed in oil.

As the size of the anion increases from  to , the covalent character increase and hence the solubility in non-polar solvent increases. 

Determinants of Individual differences in human beings relate to both heredity and environment interacting together. By heredity we mean the influence of factors inherent in the child himself from the time he is conceived. Environment also plays a key role in the individual's development.

Classroom management: Classroom management refers to the actions and strategies teachers use to solve the problems of order in classrooms.

It involves activities such as:

• stating a set of ground rules for the classroom and organizing instruction
• taking charge of the classroom activities
• creating a productive learning environment
• planning strategies to deal with potential problems

NOTE:

It is said that a teacher is a friend, philosopher and guide because a teacher plays all these vital roles in respect of pupils. It is based on the intent and capacity that a teacher possesses, exposed to which, a student is influenced to make a positive difference in his own life as well as in the society and the world at large.

Affective motives deal with the need to reach satisfying feeling states and obtain personal goals. Maslow's theory deals with all types of needs. His Hierarchy of Needs Theory includes Psychological needs (food, air, water.) Safety needs (personal security, health.) Love and Belonging need (friendship, intimacy.) Esteem needs (respect, status.
Hence, this is the correct answer.

The correct answer is Odisha.

Key Points

• India is the world's fifth-largest producer of manganese after China, Gabon, South Africa, and Australia.
• Manganese is not found as a free element in nature. It is usually found in combination with iron.
• The most important manganese ore is pyrolusite.
• Manganese is primarily used in the iron and steel industry.
• It is the essential raw material for manufacturing steel alloys.
• 6 kilograms of manganese ore is required for manufacturing one tonne of steel.
• State-wise reserves of Manganese:
  • Odisha (44%),
  • Karnataka (22%),
  • Madhya Pradesh (13%), etc.

India recently overtook Hong Kong as the world’s fourth-largest equity market, boasting a total market value of $4.33 trillion, surpassing Hong Kong’s $4.29 trillion. The leading global stock markets are currently the U.S., China, and Japan. This milestone underscores India’s rising prominence in the global financial arena, propelled by a robust GDP, political stability, foreign investments, and its appeal as an alternative to China. Meanwhile, Hong Kong grapples with challenges like COVID-19 restrictions, regulatory crackdowns, a property crisis, and geopolitical tensions, affecting its attractiveness to investors.

Invest India will host the 27th World Investment Conference (WIC) in New Delhi from December 11-14, 2023, providing a platform for global collaboration and discussions on shaping the future of investments.

This is the correct option because ocean water is not fit for drinking.

This is the correct option because none of the above is biodegradable. Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple organic molecules by micro-organisms and other living things using composting, aerobic digestion, anaerobic digestion or similar processes.

As given,
∠BOC = 110^o
And, we know incentre of a triangle is a point where angle bisector of triangles meet.
So, which means ∠OCB =∠OBC
∠BOC +∠OCB+∠OBC = 180^o
⇒∠OCB + ∠OBC = 180^o − 110^o
⇒∠OCB +∠OBC = 70^o

Since, ∠ABC = 2∠OBC
∠ACB = 2∠OCB
So, ∠ABC+∠ACB = 2 × 70^o
⇒∠ABC + ∠ACB = 140^o
Now, in triangle ABC.
∠ABC +∠BAC +∠ACB = 180^o
⇒∠BAC  +140o = 180^o
⇒∠BAC = 180o − 140^o
⇒∠BAC = 40^o
Hence, the correct answer is 40^o.