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Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22)


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55 Questions MCQ Test Sample Papers for Class 12 Medical and Non-Medical | Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22)

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Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 1

The IUPAC name of isobutyl alcohol is :

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 1

The structural formula of isobutyl alcohol is

IUPAC name : 2 methyl propan-1-ol

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 2

Formation of ortho hydroxy benzoic acid from phenol using sodium hydroxide is:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 2

Phenoxide ion generated by treating phenol with sodium hydroxide. Further it undergoes electrophilic substitution with carbon dioxide to form ortho hydroxybenzoic acid as the main reaction product.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 3

Glucose and fructose are prepared in equal amount when:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 3

It is a method of preparation of glucose form sucrose i.e. cane sugar.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 4

Which is true for crystalline solids:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 4

The other three are characteristics of isotropic solids.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 5

All the elements of group 15 form EX3 and EX5 except:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 5

Nitrogen does not form pentahalide due to non-availability of the d orbitals in its valence shell.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 6

When constituent particles are present only on the corner positions of a unit cell:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 6

The others are the type of centred unit cell which have one or more constituent particles present at positions other than corners in addition to those at corners.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 7

Chloroform mixed with nitrogen gas is a type of which solution:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 7

Chloroform mixed with nitrogen gas is an example of Liquid + gas solution.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 8

What is incorrect about fibrous proteins:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 8

It is a characteristic of globular protein.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 9

Name the following structures of proteins: 

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 9

The structure is -primary, quaternary, tertiary and secondary.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 10

Which of the following is not a haloalkane ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 10

2-Chloro acetophenone is a substitute of acetophenone. It is phenacyl Chloride and use as a tear gas.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 11

In solid alkali halides, the appearance of colour is due to:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 11

The colour is due to excitation of electrons (at anionic site) when they absorb energy from the visible light falling on the crystals.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 12

Supersonic jet aeroplanes are responsible for depleting the conc. of ozone layer because:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 12

Nitrogen oxides emitted from the exhaust systems of supersonic jet aeroplanes is slowly depleting the concentration of the ozone layer in the upper atmosphere as nitrogen oxides (particularly nitrogen monoxide) combine very rapidly with ozone.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 13

Which of the following does not react with oxygen directly ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 13

Platinum (Pt) is an inert metal and does not react very easily. All other elements, Zn, Ti and Fe, are quite reactive.
Hence, Pt does not react with oxygen directly.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 14

In ______the domains are oppositely oriented and cancel out each other’s magnetic moment :

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 14

MnO is diamagnetic in nature.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 15

Which of the following is not a chiral compound :

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 15

It does not contain asymmetric carbon atom.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 16

For any solution the partial vapour pressure of each volatile component in the solution is directlyproportional to its_______________.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 16

According to Raoult’s law, for any solution the partial vapour pressure of each volatile component in the solution is directly proportional to its mole fraction.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 17

The value of van’t Hoff factors for K2SO4, NaCl and KCl is :

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 17

K2SO4 ionizes to give 2K+ and
SO4 - ions (total 3 ions). NaCl gives Na+ and
Cl- ions(total 2 ions) KCl gives K+ and Clions
(total 2 ions).

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 18

Many wet gases are dried by passing through sulphuric acid, this shows sulphuric acid is:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 18

Sulphuric acid has strong affinity for water as moisture in gases that act as a strong dehydrating agent.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 19

Choose the molecules in which carbon atom marked with asterisk (*) is asymmetric ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 19

Asymmetric carbon atoms are those which have four different groups attached to carbon atom.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 20

Calculate the number of atoms per unit cell of iron crystal lattice if the edge length is 268 pm anddensity is 7. 86 g / cm3: [Molar mass of Fe = 56 g / mol].

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 20

a = 268 pm = 268x10-10 cm
d = 7.86 g cm-3
M =56g m of-1
NA = 6.022×1023 mol-1
n = ?

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 21

How much amount of NaCl in gram will be required for the preparation of its 5,6 w/v 1000 mlaqueous solution ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 21

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 22

Fuming nitric acid is a mixture of:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 22

Fuming acid =HNO3 + NO2

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 23

The presence of halogen atom in the haloarenes directs the incoming substituent in electrophilessubstitution reactions to:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 23

∴ Electron density is highest at ortho and para positions, so, halogen atom (x) directs the incoming substituent in electrophilic substitution reaction to ortho and para positions.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 24

Give the major product in the following reaction:

C2H5Br + alc. AgCN → Product

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 24

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 25

Glucose is converted into ethanol in the persence of:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 25

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 26

Which allotropic form of sulphur is most stable at room temperature:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 26

Rhombic sulphur consists of 8 sulphur atoms arranged in an octahedral shape which form the most stable structure that doesn’t change gradually.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 27

The number of sulphur molecules in monoclinic and rhombic sulphur:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 27

Both rhombic and mono clinic sulphur have S8 molecules which is the most allotropic form.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 28

Sulphur dioxide when passed through water forms:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 28

SO2(g) + H2O(l) ⇋ H2SO3(l)

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 29

Choose the correct answer from the options given:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 29

The given structure (i), (ii) and (iii) is showing Sulphurous acid, pyro sulphuric acid, sulphuric acid respectively.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 30

Sulphuric acid is used to manufacture more volatile acids from their corresponding salts due to its:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 30

Sulphuric acid have high boiling point and low volatility that combines with salt like NaCl to form volatile acids like HCl and HNO3.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 31

In the complex ion [AuXe4]2+, Xe acts as:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 31

Xe acts as a central atom in the complex [AuXe4]2+

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 32

Hybridisation shown by Au in [AuXe4]2+ is:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 32

sp3d hybridization produces liner geometry
Hybridisation = 1/2 [No. of electrons in the value shell of atom + No. of monovalant atoms surrounding the atom - charge on cation + change on anion]

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 33

Compounds of noble gases except _______ are known.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 33

Helium has complete last shell. It does not react with any other element to form compound.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 34

Xe is a ___________ ligand.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 34

As it can donate single pair of electrons from one atom.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 35

In the formation of complex entity, the central atom acts as:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 35

As it accepts pair of electrons from the ligand, thus forming coordinate bond.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 36

SN2 mechanism is not favoured when:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 36

When an electrophile is attached to allylic, tertiary or benzylic carbon SN1  reaction is favoured.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 37

Which of the following is likely to proceed with SN1 reaction:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 37

Electrophile at tertiary carbon, weak nucleophile and protic solvent.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 38

Which of the following factors does not have any significant effect on solubility of solids in liquids ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 38

Pressure does not have any significant effect on solubility of solids in liquids. As solids and liquids are highly incompressible and thus they remain unaffected by changes in pressure.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 39

Which of the following methods is must suitable for determination of molecular mass of polymers ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 39

Molecular mass of polymers can be calculated using osmotic pressure method. This is because the values given by other colligative properties are so low that they cannot be measured.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 40

Mark the correct statement.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 40

Fluorine is a stronger oxidising agent than chlorine due to low enthalpy of dissociation of F-F bond.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 41

The acid strength of tertiary alcohol is much lesser than that of primary alcohol. It is due to presence of:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 41

An electron-releasing group (–CH3, –C2H5) increases electron density on oxygen tending to decrease the polarity of O-H bond which leads to decrease in acid strength.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 42

The increasing order of boiling point of haloalkenes is:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 42

The boiling point of haloalkanes increases in following order:

RCl < RBr < RI

It is due to increases in size and mass of the halogen atom by which the magnitude of van der waal forces of attraction increases and boiling point of haloalkane increases.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 43

Ethanal undergoes reduction with LiAlH4 to produce:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 43

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 44

The number of hydrogen bonds between cytosine and guanine is:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 44

Cytosine(C) pairs with guanine (G) through three hydrogen bonds.

C ≡ G

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 45

Given below are two statements labelled as Assertion (A) and Reason (R) and the question give the following line select the must appropriate answers from the options given below:

Assertion (A): A body-centred cubic (bcc) unit cell has an atom at each of its corners and also one atom at its body centre.
Reason (R): There are two atoms per unit cell.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 45

No. of atoms = 8 corners x 1/8 per corner atom = 8 x 1/8 = 1 atom

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 46

Direction: Given below are two statements labelled as Assertion (A) and Reason (R) and the question give the following line select the must appropriate answers from the options given below:

Assertion (A): Salmon should be included in diet.
Reason (R): Tryptophan is an essential amino acid.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 46

Salmon help body to produce serotonin. Salmon contains amino acid tryptophan, which helps to produce more serotonin. Essential amino acids need to be taken by diet.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 47

Direction: Given below are two statements labelled as Assertion (A) and Reason (R) and the question give the following line select the must appropriate answers from the options given below:

Assertion (A): Nitrogen exists as diatomic molecule with a triple bond.
Reason (R): Phosphorus and arsenic form single bonds.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 47

Nitrogen has the unique ability to form pπ-pπ with itself. Thus, it forms triple bond (one s and two p orbitals).

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 48

Direction: Given below are two statements labelled as Assertion (A) and Reason (R) and the question give the following line select the must appropriate answers from the options given below:

Assertion (A): Ethanol mixed with methanol is called as denatured alcohol.
Reason (R): Methanol is oxidised to methanal and then to methanoic acid.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 48

Ethanol mixed with methanol is called as denatured alcohol.
Denatured alcohol is harmful to body. It may cause blindness or death in some cases.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 49

Direction: Given below are two statements labelled as Assertion (A) and Reason (R) and the question give the following line select the must appropriate answers from the options given below:

Assertion (A): Wherever a sphere of the second layer is above the void of the first layer (or vice versa)
a tetrahedral void is formed.
Reason (R): The spheres of the third layer are exactly aligned with those of the first layer.

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 49

Tetrahedral voids are formed because a tetrahedron is formed when the centres of these four spheres are joined.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 50

Match the following:

Which of the following is the best matched options ?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 50

Adenine – DNA.
Adenine is a purine base found in DNA. Fibrous structure of protein-Tertiary structure. Tertiary structure of proteins are fibrous structure and globular structure-Mutarotation-Glucose

The process which involes the change in the optical rotation of either form of glucose in aqueous solutions to that of equilibrium mixture is called mutarotation.

It is a monosaccharide having three carbon atoms and aldehyde group, so it is an example of aldotriose.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 51

Which of the following analogies is correct:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 51

For BCC (Body centred Cubic
unit call)
Number of atoms per unit cell

For FCC (Face centred cubic unit cell) Number of atoms per unit cell

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 52

Complete the following analogy:Number of moles of solute per litre of solution: A:: Number of moles of solute per kilogram of solvent: B

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 52

The number of moles of solute per litre of solution is called molarity

The number of moles of solute per kilogram of solvent is called molality.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 53

Read the passage given below and answer the following question

The chief sources of proteins are milk, cheese, pulses, peanuts, fish, meat, etc. They occur in every part of the body and form the fundamental basis of structure and functions of life. They are also required for growth and maintenance of body. The word protein is derived from Greek word, “proteios” which means primary or of prime importance.

Amino acids contain amino (–NH2) and carboxyl (–COOH) functional groups. Depending upon the relative position of amino group with respect to carboxyl group, the amino acids can be classified as α, β, γ, δ and so on.

Name the most abundant bio molecule of the living system:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 53

Proteins occur in every part of the body and from the fundamental basis of structure and functions of life. So, it is most abundant biomolecule of the living system .

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 54

Read the passage given below and answer the following question

The chief sources of proteins are milk, cheese, pulses, peanuts, fish, meat, etc. They occur in every part of the body and form the fundamental basis of structure and functions of life. They are also required for growth and maintenance of body. The word protein is derived from Greek word, “proteios” which means primary or of prime importance.

Amino acids contain amino (–NH2) and carboxyl (–COOH) functional groups. Depending upon the relative position of amino group with respect to carboxyl group, the amino acids can be classified as α, β, γ, δ and so on.

Choose the correct function of proteins:

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 54

Proteins are required for regulation of body tissues and organs.

Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 55

Read the passage given below and answer the following question

The chief sources of proteins are milk, cheese, pulses, peanuts, fish, meat, etc. They occur in every part of the body and form the fundamental basis of structure and functions of life. They are also required for growth and maintenance of body. The word protein is derived from Greek word, “proteios” which means primary or of prime importance.

Amino acids contain amino (–NH2) and carboxyl (–COOH) functional groups. Depending upon the relative position of amino group with respect to carboxyl group, the amino acids can be classified as α, β, γ, δ and so on.

Which of the following is the correct structure of amino acids?

Detailed Solution for Test: Class 12 Chemistry: CBSE Sample Question Paper- Term I (2021-22) - Question 55

Amino acids contain amino (–NH2 ) and carboxyl (–COOH) functional groups.

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