Bihar STET Paper 2 Chemistry Mock Test - 1 - Bihar PGT/TGT/PRT MCQ

By Fajans' rule,
Smaller the size of cation, larger the size of anion.
Larger the charge ord-electrons present, then larger the polarising power of cation and larger the covalent nature and smaller the solubility in water.

Cu²⁺ due to shielding effect causes more screening than Zn²⁺.
Thus, polarising power of Na⁺ <Zn²⁺ < Cu²⁺ hence, ionic nature and solubility in water is in order
CuS < ZnS < Na₂S

Macromolecule is made by joining smaller molecules(monomers)by covalent bond formation.

In A one and more different types of ligands are present.

The number of optically active isomers = 2ⁿ⁻¹−2^{n−1/2 ​}=2³⁻¹−2^3−1/2 ​=2.

100mLof 0.01 M CaCI₂ = 100 x 0.01 millimoles CaCI₂
= 0.001 mole CaCI₂
= 0.001 x 111 g CaCI₂
= 0.111 g pure CaCI₂
But, residue = 0.15 g
Thus, impurity = 0.15 - 0.111= 0.039 g

A slightly weaker base (NaHCO₃) is used in the second step S_N2 reaction otherwise oxirane formation would be preferred.

The correct answer is Option D.
 

Bis(acetylacetonato)oxovanadium(IV) has square pyramidal geometry.

(C—H) bond lengths are different from (B—H) and (N—H) bond lengths. Both are planar.

When chlorine and Ethane are taken with chlorine in excess only then we have more than one product like chloroethane, dichloroethane, trichloroethane etc. To avoid this we should take Ethane in excess because when we will take it then in excess then we will have only single time chlorination and we will get monochloroethane.

Acidic strength of carboxylic acid -

–  More acidic than phenols or alcohols.

–  Acidity increase with the presence of a group with  -I effect in the alkyl group.Whereas it decreases with the presence of  +I group.

–  Acidity increases with increase in the number of halogen atoms on  - position.

–  It decreases with increasing distance of halogen from   

–  It increases with increase in the electronegativity of halogen.

- CF₃COOH > CCl₃COOH > HCOOH > CH₃ COOH

Reducing agents reduce others by oxidizing itself. Elements which lose electron become oxidize and reduce other elements by donating electron.

Suppose x m. mole NaOH was added

It has network Structure.

18g H₂O = 1mol water = 6.02 x 10²³ molecules of water = 6.02 x 10²³ atoms of oxygen.

Attractive forces tend to bring two atoms close to each other whereas repulsive forces tend to move them away. In hydrogen, the magnitude of the new attractive forces is greater than that of new repulsive forces. As a result, two atoms come close to each other and potential energy decreases. The atoms approach each other until the equilibrium stage is reached where the net force of attraction balances the force of repulsion and system acquires minimum energy. 

The correct answer is option D(None of the above)
The given compound is 4-Bromo-3methylheptanal

In solid state, N₂O₅ exists as nitronium nitrate 
In   nitrogen is sp and in  , nitrogen is sp².

The correct answer is Option D.

From the rate equation rate =k[A][B], we can say that the reaction is first order in A and first order in B. Hence, the overall order of the reaction is 2.
(A)The unit of k must be mol-1s-1
Hence, the statement A is incorrect.
(B) The half life period is not constant. It is inversely proportional to the concentration of reactants. Hence, the statement B is incorrect.
(C) The rate of formation of C is one half the rate of disappearance of A.
 d[C] / dt = −d[A] / 2dt
Hence, the statement C is incorrect.
(D) The value of k is independent of the initial concentration of A and B. Hence, the statement D is correct.

The correct answer is option D
The statement D is false.
Two sucrose solutions of the same molality prepared in different solvents will have different freezing point depression. This is because the molal depression in freezing point constant K_b​ is different for different solvents.
The freezing point depression = ΔT_f​=K_b​×m
Here, m is the molality of sucrose solution.

NaBH₄ brings about reduction of carbonyls by hydrid e transfer mechanism at planar sp² carbon. Hence, if a chiral carbon is generated, racemic mixture is always produced.

• Molecules of most electronegative elements, compounds having an element in the highest oxidation state and oxides of metals and nonmetals are examples of oxidising agents.
• But sodium hydride is a metallic hydride, so it is not an oxidizing agent.

Multimolecular colloids are formed when a large number of atoms or molecules of a substance aggregate together to form speices having size in colloidal range. sulphur sol contains a thousand of S8 molecules.

Childhood refers to the period of the human lifespan, ranging from birth to puberty. It consists of many developmental stages and 'adolescence' is one of them.

• 'Adolescence' comes from the Latin word 'Adolescere' which means 'to grow to become mature'. It a stage which lies between the age of '12 to 19 years'.
• Emotion is a mental state associated with fear, anger, love, etc. Emotional states of an individual are the combination of physiological arousal, psychological appraisal, and behavioral changes.
• Emotionally disturbed children can be defined in terms of certain observable characteristics such as withdrawn behavior, failure to achieve a level reasonably commensurate with ability or tendency towards fighting, and other aggressive behavior.

​Key Points

Emotional disturbances of adolescents:

• They show the same emotions as they used to show in their childhood  i.e., fear, disgust, but the emotions of adolescence are different in their patterns.
• The emotions at this stage are more uncontrolled, intensive, and irrational.  As they gradually grow, their emotional behavior improves and become mature.
• Children who suffer from emotional disturbances generally do nail-biting, thumb sucking, depression, pulling or stretching of hairs, fear of specific objects or things, etc.
• A child wearing a well-fitted dress is not a symptom of emotional disturbance but wearing proper clothes that fit them well makes them confident.

Hence, it could be concluded that wearing a well-fitted dress is not found in the symptoms of emotional disturbances of adolescents.

The process of socialization includes communicating with another person or a group of people. It involves actively listening to the other person and also effectively reverting the other person.

The triarchic theory of intelligence is also called the three forms of intelligence. Based on this theory, research on human intelligence take a more cognitive approach. 
Sternberg explained only three types of intelligence: Componential or analytical sub theory, Experiential or creative sub theory, and Contextual or practical sub theory. 
Hence, the correct answer is, 'Social.'

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