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

If we rotate one off the molecule in a plane perpendicular to molecule, then we will get the mirror image of others which are non superimposable. So, they are enantiomers.

The gaseous pollutants come down to the earth in form of rain forms acid rain.

The correct answer is option c

Thus, a racemic mixture is obtained. A racemic mixture is one that has an equal amount of left and right handed enantiomers of a chiral molecule.

Greater the resonating structures, greater the stability.
I : (Y)with negative charge has greater delocalisation of n-electrons than HNO₃(X).

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

The complex [Co(C₂O₄)₂Cl₂]^3- show both geometrical and optical isomers.

Phenolic — OH does not undergo further substituton. 

The formula that these isomers contain no rings or double bonds. The isomers must be alcohols and ethers.
For The alcohols
1. CH₃CH₂CH₂CH₂OH, butan 1-ol
2. CH3CH₂CH(OH)CH₃, butan-2-ol
3. (CH₃)₂CHCH₂OH, 2-methylpropan-1-ol 
4. (CH₃)₃COH, 2-methylpropan-2-ol.
Now for the ethers.
5. CH₃CH2CH₂OCH₃, 1-methoxypropane
6. CH₃CH2OCH₂CH₃ , ethoxyethane
7. (CH₃)₂CHOCH₃ , 2-methoxypropane.

The given compound is superimposable on its mirror image, so it is achiral. Achiral molecules which have chirality centers are called meso compounds. Meso compounds are possible if two (or more) chirality centers in a molecule have the same set of four substituents.

The correct answer is option B
Here, E_f ​> E_b​

 

Green flame is given by Ba²⁺

BaS₂O₃+K₂CrO₄ → BaCrO₄+K₂S₂O₃   yellow ppt

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

Whipped cream is example of foam.

IV. Electrostatic force of attraction between  and
V. H₂O molecules joined together by dipole-dipole interaction.
VI. Outer H₂O molecule joined to by ion-dipole interaction.

Heat of vapourisation is the responsible factor.

• Fluorine is the most electronegative element. It can gain one electron.​
  Thus, Oxidation number = -1
  F+ e- → F^-
• Due to very high (IE), it cannot lose electrons.

(a) H^- (-1), (H⁺ (+1)
(b) O ^-2 in oxide, -1 in peroxide, and +2 in OF₂
(c) +3 in N₂O₃, -3 in NH₃, +3 in HNO₂, +5 in HNO₃, + 1 in N₂O

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

Here, Grignard reagent acts as base and acid base reaction occurs (as hydrogen of sp hybridized C atom acts as acid). So CH₃- takes H+ and forms CH₄.

The correct answer is Option B
Milk is an emulsified colloid of Liquid is dispersed in liquid where liquid butterfat globules dispersed within a water-based solution.

A teacher can be satisfied with his quality of teaching if he/she is able to get counter questions from students on the concepts which have been taught in class. This ensures that the student is able to understand the concept and shows interest in the subject.

Essay type questions do not provide scope to assess the students objectively. Mrs. Suman is using essay type questions. These questions are subjective in nature and their answers vary from subject to subject; whereas multiple choice questions, true/false type questions, or one word answer type questions are used to assess the students objectively.

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. 

Variability in learning styles of students should be valued and seen as a reflection of human diversity.

The correct answer is Uttarakhand.

Key Points

• Nanda Devi Biosphere Reserve is located in the northern part of India in Uttarakhand. 
• It comprises Nanda Devi National Park and the Valley of Flowers National Park.
• Declared as Biosphere Reserve under the UNESCO’s Man and Biosphere (MAB) programme.
• It has been included in the World Network of Biosphere Reserves.
• The biosphere reserve is spread in Chamoli, Pithoragarh and Bageshwar district of Uttarakhand.
• It comprises the catchment area of Alaknanda River and its tributaries, including Rishi Ganga, Dhauli Ganga, Pushwapati, and Khir Ganga.
• Fauna:- Snow leopard, the Himalayan musk deer, Asiatic black bear, Himalayan brown bear, bharal and Himalayan tahr etc.
• Flora: Birch, Rhododendron, Fir, Juniper, Lichens etc are found in the reserve.

Water contamination is the defilement of water bodies like lakes, streams, seas, aquifers and groundwater. This type of natural corruption happens when contaminations are specifically or in a roundabout way released into water bodies without satisfactory treatment to evacuate unsafe mixes.

Hence, Option B is correct.

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".