Bihar STET Paper 2 Chemistry Mock Test - 7 - Bihar PGT/TGT/PRT MCQ

Fe²⁺ is added asFeSO₄
Fe⁺ is formed by charge transfer from NO to Fe²⁺ 



Fe⁺ has three unpaired electrons (N).

(d) Among alkali metals, melting point decreases as the strength of metallic bonding decreases with increasing size of the atom. Thus, Cs has the lowest melting point (28.5°C) and will melt at 30°C.

The valence bond (VB) theory of bonding was mainly developed by Walter Heitler and Fritz London in 1927, and later modified by Linus Pauling to take bond direction into account. The VB approach concentrates on forming bonds in localized orbitals between pairs of atoms, and hence retains the simple idea of Lewis structures and electron pairs. 

All four substituent are different so it is chiral compound.

The correct answer is Option C.

The molar masses of glucose and water are 180 g/mol and 18 g/mol respectively.
 
Number of moles of glucose = 18/80 = 0.1
Number of moles of water = 178.2/18
 =  9.9
Mole fraction of glucose = 0.1/(0.1+9.9)
= 0.01
Relative lowering in vapour pressure is equal to the mole fraction of glucose.
(760−P)/760 = 0.01
760 - P = 7.6
P = 760 −7.6 = 752.4 torr

Phenolic — OH does not undergo further substituton. 

With aluminium isopropoxide (MPV reduction), carbonyls are selectively reduced to alcohols leaving other groups intact.

In the above reaction, appropriate conformer of the given compound is drawn first which has ‘Br’ and ‘H‘ an anti position (I).

Coagulation is the destabilization of Colloids by neutralizing the electric charge of the dispersed phase particles, which results in aggregation of the colloidal particles.

The modern periodic table orders elements by increasing atomic number, which is the number of protons in the atom of the element. Mendeleev did not know about the parts of the atom, so he used the next best thing -- atomic weight.

Although it is secondary alcohol, it forms a very unstable carbocation (Cl is electron withdrawing group), hence it does not give turbidity with Lucas reagent in cold condition.

The correct answer is option B.

The I.U.P.A.C. name for Fe(C₅H₅)₂ is bis(η⁵ -cyclopentadienyl) iron(II) 
The oxidation state of iron is +2 and is written in parenthesis in roman numerals. Two cyclopentadienyl ligands are coordinated to Fe. The prefix bis indicates 2. η⁵ indicates that the cyclopentadienyl ligands are penta coordinates.

The correct answer is option C
ΔT = Kf​ × molality × (1+α)(HX ⇌ H+   + X−)
Given molality = 0.2;  degree of ionization is 0.3
=1.85×0.2×(1+0.3)
=0.481K
The freezing point of the solution will be 0.81 K.

The correct answer is Option B
Xe forms maximum no. of compounds among noble gases. It forms bonds with oxygen and fluorine.

Special schools are schools that cater to children with special needs. Students with special needs can be classified into five categories-

• Physical impairment
• Visual impairment
• Hearing and speech impairment
• Low mental ability
• Learning disability 

Key Points

The backward child is also called a slow learner. The child is unable to cope with routine work normally expected of his/her age group. The rate of learning is the basis for identifying slow learners. Special schools are required for backward children when Backwardness is due to any serious physical handicap. He finds it difficult to keep pace with the normal child in his school work. The characteristics of backward learners are as given below: 

1. They have limited cognitive capacity.
2. For them rational thinking is impossible.
3. They have the capacity for rote learning and can retain memory whatever is learned only with a lot of practice and revision in comparison with the normal child.
4. They have poor memory.
5. They are distractive and lack concentration in the classroom.
6. They have an Inability to express through language. The slow learner has cognitive problems, language-related problems, auditory perceptual problems, visual-motor problems, and social-emotional problems.

Note:  Lower achievers don't come under students with special needs.

From the above, we can say that special schools are required for backward children when backwardness is due to any serious physical handicap as special schools are for students with special needs.

Lev Vygotsky is a Soviet psychologist who did plenty of research on children and came up with the sociocultural theory of cognitive development. His theory was based on the effects of social interactions on a child's cognitive development.

Objective questions are beneficial to assess the knowledge of the complete syllabus in short time. Maximum syllabus can be covered by making objective type questions. Hence, this is the ideal way to assess whether the child has prepared entire syllabus or not.

The Ministry of Education released the National Education Policy (NEP) in 2020. The policy aims to adapt India's educational system to the demands of the twenty-first century.

Key PointsAccording to NEP 2020, each subject's curriculum will be pared down to its core essentials, to allow room for critical thinking and more holistic, inquiry-based, discovery-based, discussion-based, and analysis-based learning.

• NEP 2020 provides a reduction in content and increased flexibility in the school curriculum.
• It promotes multilingualism in the classroom.
•  The main focus is here on constructive rather than rote learning and it must be accompanied by parallel changes in school textbooks.
• Classroom sessions will frequently include more enjoyable, creative, and exploratory activities.​
• NEP 2020 places a strong emphasis on using mother tongue, local, or regional languages at least till grade five.

Thus, NEP 2020 does not give emphasis on learning from the material given in the textbooks.

Assessment of learning refers to the process of evaluating a student's knowledge, skills, and understanding of a subject or topic. The primary goal of the assessment of learning is to determine the level of achievement of learning outcomes and provide feedback to both students and teachers. 

NEP 2020 emphasizes the role of teachers in promoting critical thinking, creativity, and holistic development of students.

Education Policy lays particular emphasis on the development of the creative potential of each individual. It is based on the principle that education must develop not only cognitive capacities - both the ‘foundational capacities ’of literacy and numeracy and ‘higher-order’ cognitive capacities, such as critical thinking and problem solving – but also social, ethical, and emotional capacities and dispositions.

National Education Policy 2020-

According to NEP 2020, A good educational institution is one in which every student feels welcomed and cared for, where a safe and stimulating learning environment exists, where a wide range of learning experiences are offered, and where good physical infrastructure and appropriate resources conducive to learning are available to all students.

Key Points Some important fundamental principles of the NEP 2020 are- 

• Establishment of the linkage of the concepts with the environment or we can say that the linkage of the school with the home.
• It includes the overall development of the leader, it covers all three aspects as Cognitive domain, affective domain, and psychomotor domain.
• It will include Progress of the Child in Inquiry-Based Learning, Quiz, Projects Roleplay, Group Work, Portfolios, etc, as part of the assessment of the students.
• Promoting self-assessment and the peer assessment done by the student in the classroom.
• Making board examination low stake and less stressful by focusing on Logic and Core Competencies
• It emphasizes group work as well as individual work, NEP 2020 links the study to the curriculum.
• Hence we conclude that all the objectives given in the question are correct for the assessment of the student.

Important Points  There are many changes in the assessment of the child, proposed in NEP 2020:

• Continuous Tracking Of Learning Outcome Of Each Child.
• Board Examinations to be made more flexible with an assessment of essential skills.
• Assessment to focus on core concepts, higher-order, and foundational skills 
• AI-based soft wares to help track the progress of students to enable them to make optimal career choices.
• National Assessment Centre (PARAKH) will bring greater synergy to board examinations.
• Self Assessment & Peer Assessment.
• National Testing Agency (NTA) will work to offer a Common Aptitude Test of high quality to eliminate the need for coaching for these exams. 

The teaching method is a way to put theory in practice with the help of principles, pedagogy, and management strategies. It helps the teachers to plan and present the lesson coherently.

• There are different kinds of teaching-learning methods that make learning a fruitful process and the 'interactive method' is one of them.

Key Points

Interactive methods:

• Interactive methods ensure the active participation and involvement of children which play a very vital role in learning and shaping the personality of a child.
• In these methods, teachers facilitate students as a facilitator by providing with proper environment and materials to make them learn at their own pace.

• It provides autonomy to students to control their own work and to solve problems and analyze texts to demonstrate an understanding of a task.

Hence, it could be concluded that teachers need to practice 'Interactive methods'.

Additional Information

• Lecture method:  It is a teacher-centered method in which the teacher delivers a lecture on different topics, which makes class monotonous and students a passive learner.
• Narratives: These are used as a method of teaching at the primary level to engage children effectively in learning by providing the contextual learning environment to children.

Let the number be x.
According to the question,

The logic follows here is:

(Number)2 : (Number)3 :: (Number)2 : (?)3

49 : 343

(7)2 : (7)3 

Similarly,

121 : ?

(11)2 : (11)3 

121 : 1331

? = 1331

Hence, the correct answer is "1331".

Given: 24$3@8#45*5
After replacing the symbols we get:
24 + 3 x 8 - 45 ÷ 5
= 24 + 3 x 8 - 9
= 24 + 24 - 9
= 48 - 9
= 39
Hence, 39 is the correct answer.