Bihar STET Paper 2 Chemistry Mock Test - 4 - Bihar PGT/TGT/PRT MCQ

water pollution causes the death of fishes because of decrease in amount of dissolved oxygen.

The correct answer is option D

Oxidation number of Cr changes from +6 to +3.

The correct answer is Option B.
An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. 
Examples: Oil and water mixtures are emulsions when shaken together. The oil will form drops and disperse throughout the water. So, curd is not an emulsion.
 
Foam is a substance where air or gas bubbles are trapped inside a solid or liquid. 
Examples: Styrofoam, whipped cream, soap bubbles. So, mist is not a foam.
 
An aerosol is a colloid of fine solid particles or liquid droplets in air or another gas. Aerosols can be natural or not. An Example of natural aerosol is fog. Examples of artificial aerosols are dust, particulates, air pollutants and smoke.
 
Solid sol is a type of colloid of the form of one solid dispersed in another continuous solid. So, cake is not solid sol.

The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is called its electronegativity.
Electronegativity is a dimensionless property since it is only a tendency. It only indicates the net result of the tendencies of different elements to attract the bond forming electron pair.

NH₃ undergo intermolecular hydrogen bonding and therefore it has higher boiling point compared to other hydrides of group 15.

Since, ΔG ° < 0, hence it is spontaneous in forward direction . Oxidation number of Xe decreases hence, it is an oxidising agent and oxidation number of F increases, hence it is a reducing agent.

Stoichiometric compounds of hydrogen are formed with s-block elements. Only Group I elements form stoichiometric hydrides with Hydrogen as same as halides.

At planar carbonyl carbons, hydride ion attacks from both sides giving both stereomers. Hence, the product diols would be all stereomers of 2, 3 - butanediol.

(B) & (C) compounds are R-configuration.

If balanced, then to balance charge
x = - 1

Because of the small size of boron atom and presence of only six electrons in its valence shell, B(OH)₃ accepts a pair of electrons from OH^- ion of H₂0, releasing a proton. 

The correct answer is option A
Let initial concentration be ao​
After concentration decreases by

Using first order kinetic equation,

One of the most important chemical properties of hydrogen peroxide i.e. H₂O₂ is that it is acidic in nature. It is weakly acidic in nature and pure hydrogen peroxide turns blue Litmus red (an indication of acidic nature).

The water which forms come with soap is known as hard water. The hardness that occurs due to the presence of bicarbonates of calcium and magnesium is temporary hardness. Temporary hardness can be removed by boiling and Clark’s process.

The correct answer is Option A.
Aromatic Primary amine will form the most stable diazonium salt because it releases water when it reacts with nitronium ions. If aliphatic primary amine reacts with nitrosonium ion it Also releases water but in this case water reacts with alkyl diazonium salt and it forms alcohol while benzene diazonium salt does not react with water at this temperature.

Adolescence is a phase of life of a person when he is no more a child and not yet an adult. Life is full of tremendous energy. Curiosity and experimentation at one time pave the path to success and at another, may cause uncertainty. 

NEP 2020 emphasizes providing equal opportunities for all genders and addressing gender-based discrimination in education.

The cause of Rohit's poor performance can be either physical problems, family disturbances or his maturation process.
Rohit may not be physically fit or may be suffering from some physical ailment, which might be affecting his studies and resulting in poor performance.
There may be some disturbances at home, which may be affecting his studies. A construction work at home or a fight amongst elders could be the reason behind his recent performance.
The mental capabilities of Rohit are maturing but maybe not up to the level that is required to understand the concepts taught in the class. Thus, he might be performing poorly.
Apart from this, the teacher might lack the required knowledge of modern educational and psychological theories. This can lead to students' poor academic performance. Several other factors also lead to poor academic achievement, such as social factors, economic factors and political conditions.

Scaffolding process in education is a teaching strategy to expedite children's learning process. Using this method, teachers first demonstrate how to deal a problem, then go back and offer support as and when required. Once basic learning is done, they give prompts, ask questions, cues to make the child learn and build the concept on what he has already learned.

Naresh loves to work without supervision and set goals that are challenging, but not impossible. He learns best in solitude; thus he is a intrapersonal learner. The intrapersonal learners, as opposed to interpersonal, are the ones who work and learn best when they are alone.
They are also motivated by internal forces, rather than external ones. So, Naresh is motivated by internal forces.

Programmed instruction method is most suitable to teach heterogeneous group of students for self placed learning. Programmed instruction is a method of presenting new subject matters to students in a graded sequence of controlled steps.

Inclusive Education:

• It refers to an education system that accommodates all children regardless of their physical, intellectual, social, emotional, linguistic, or other conditions.
• It provides a provision to include disabled children along with normal children in a regular classroom environment.

An inclusive classroom refers to an education system that includes children regardless of physical, intellectual, social, linguistic, or other differently-abled conditions.

• In an inclusive classroom with diverse learners, cooperative learning, and peer-tutoring is actively promoted to facilitate peer-acceptance.
  • Cooperative learning: It refers to a heterogeneous group where students work collaboratively to achieve learning outcomes. It develops critical thinking, brainstorming, communication, and life long learning skills.
  • Peer tutoring: It refers to the learning process where fellow students teach each other. In this strategy, a higher-performing student is paired with a lower performing student to teach specific skills.
• An inclusive classroom is not limited to children with a disability but also gifted children, economically disadvantaged children, children from remote populations, children belonging to ethnic, linguistic, or cultural minorities, or children from other marginalized groups.

Therefore, Social skills development can become a positive strength for normal children in inclusive classrooms.

‘Choice of challenge’ is a characteristic of motivation.

Motivation is the drive to achieve something in life that satisfies one’s needs. There are two primary types of motivation namely, intrinsic motivation and extrinsic motivation. A number of behavioural characteristics are indicators of high motivation. Here are some of the important factors and some ways to help a child develop these characteristics:

• Persistence is the ability to stay with a task for a reasonably long period of time. While very young children cannot concentrate on one activity for an hour, there are still measurable differences in the length of time that young children will engage in an activity. A highly motivated child will stay involved for a long period of time, whereas an unmotivated child will give up very easily when not instantly successful.  Children learn persistence when they are successful at a challenging task.
• Choice of challenge is another characteristic of motivation. Children who experience success in meeting one challenge will become motivated, welcoming another. These motivated learners will choose an activity that is slightly difficult for them but provides an appropriate challenge. Unmotivated children (those who have not experienced early success) will pick something that is very easy and ensures instant success.
• The amount of dependency on adults is another indicator of motivation. Children with strong intrinsic motivation do not need an adult constantly watching and helping with activities. Children who have a lower level of motivation or are extrinsically motivated need constant attention from adults and cannot function independently.
• The last indicator of motivational level is emotion. Children who are clearly motivated will have a positive display of emotion. They are satisfied with their work and show more enjoyment in the activity. Children without appropriate motivation will appear quiet, sullen and bored.

Government of India and ADB have signed a $23 million loan agreement to strengthen the fintech ecosystem in India. Under this, an International Fintech Institute (IFI) will be established to strengthen fintech education, boost start-up success rate and promote fintech research and innovation.

The correct answer is Dynasty.

Key Points

• When members of the same family become rulers one after the other, the family is called a dynasty.
• An example of a dynasty is the Mauryan Dynasty.
• Wherein, there were three important rulers- Chandragupta, his son Bindusara, and Bindusara's son Ashoka.
• Alternative terms for dynasty are 'family', 'clan' etc.

 Thus, we can say that Dynasty is when members of the same family become rulers one after the other.

Additional Information

•  Empire is a political construct in which one state dominates over another state or a series of states.

Project Tiger is the most popular untamed life preservation task of India, which was started in 1973 to secure the reducing population of Indian tigers.

Misra Report, 1991 perceived the accompanying four essential principles of ecology: holism, ecosystem, succession and conservation