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MODEL PAPER 7 Chemistry - MODEL PAPER 7

CBSE - STD 12 Science - Chemistry (CBSE - English Medium). 37 questions in this chapter.

Question types

MODEL PAPER 7 question types

37 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

37
Questions
6
Question groups
5
Question types
Sample Questions

MODEL PAPER 7 questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
In order to prepare a $1^\circ$ amine from an alkyl halide with simultaneous addition of one $\ce{CH_2}$ group in the carbon chain, the reagent used as source of nitrogen is$..........$
  • A
    Sodium amide, $\ce{NaNH_2}$
  • ✓
    Sodium azide, $\ce{NaN_3}$
  • C
    Potassium phthalimide, $\ce{C_6H_4(CO)_2 N^{-} K ^{+}}$
  • D
    Ethanolic $\ce{NaCN}$

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
Monochlorination of toluene in sunlight followed by hydrolysis by aq. NaOH yields
  • ✓
    benzyl alcohol
  • B
    o-cresol
  • C
    2,4-dihydroxytoluene
  • D
    m-cresol

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark
In a chemical reaction X → Y, it is found that the rate of reaction doubles when the concentration of X is increased four times. The order of the reaction with respect to X is
  • ✓
    $\frac{1}{2}$
  • B
    2
  • C
    1
  • D
    0

Answer: A.

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Q 5M.C.Q (1 Marks)1 Mark
Which of the following characteristics of transition metals is associated with their catalytic activity?
  • A
    Paramagnetic nature
  • B
    High enthalpy of atomisation
  • ✓
    Variable oxidation states
  • D
    Colour of hydrated ions

Answer: C.

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Q 6Assertion (A) & Reason (B) MCQ1 Mark
Assertion $(A): 4-$nitrophenol is more acidic than $2, 4, 6-$trinitrophenol.
Reason $(R): $ Phenol is a weaker acid than carbonic acid.
  • A
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
  • C
    $A$ is true but $R$ is false.
  • ✓
    $A$ is false but $R$ is true.

Answer: D.

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Q 7Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A): The nucleophilic substitution of vinyl chloride is difficult than ethyl chloride.
Reason (R): Vinyl group is an electron-donating group.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • ✓
    A is true but R is false.
  • D
    A is false but R is true.

Answer: C.

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Q 8Assertion (A) & Reason (B) MCQ1 Mark
Assertion $(A):$ Isobutanal does not give the iodoform test.
Reason $(R):$ It does not have alpha$-$hydrogen.
  • ✓
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
  • C
    $A $ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.

Answer: A.

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Q 9Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A): Fructose can reduce Tollen's reagent.
Reason (R): Fructose is a ketone.
  • A
    Both A and R are true and R is the correct explanation of A.
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: B.

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Q 132 Marks Questions2 Marks
Answer the following:
$(a)$ What is the order of photochemical reaction?
$(b)$ For the homogeneous decomposition of $N _2 O _5$ into $NO _2$ and $O _2 ; 2 N_2 O _5(g) \rightarrow 4 N O_2(g)+O_2(g)$ Rate $= k \left[ N _2 O _5\right]$
Find out the order of reaction with respect to $N _2 O _5$.
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Q 153 Marks Question3 Marks
Conductivity of saturated solution of $BaSO _4$ at 315 K is $3.648 \times 10^{-6} ohm ^{-1} cm^{-1}$ and that of water is $1.25 \times$ $10^{-6} ohm ^{-1} cm^{-1}$. Ionic conductance of $Ba ^{2+}$ and $SO _4^{2-}$ are $110$ and $136.6 ohm ^{-1} cm^2 mol^{-1}$ respectively. Calculate the solubility of $BaSO _4$ in $g / L$.
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Q 173 Marks Question3 Marks
Depict the galvanic cell in which the reaction:
$ Z n(s)+2 A g^{+}(a q) \rightarrow Z n^{2+}(a q)+2 A g(s) $
takes place. Further show:
i. Which of the electrodes is negatively charged?
ii. The carries of current in the cell.
iii. Individual reaction at each electrode.
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Q 183 Marks Question3 Marks
Write the products formed when $(CH_3)_3 C-CHO$ reacts with the following reagents:
$i. \ CH_3COCH_3$ in the presence of dilute $NaOH$
$ii. \text {HCN}$
$iii. NaOH$
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Q 193 Marks Question3 Marks
How would you account for the following:
i. Phenols are much more acidic than alcohols.
ii. The boiling point of ethers are much lower than those of the alcohols of comparable molar masses.
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Q 225 Marks Questions5 Marks
$CoSO_4Cl._5NH_3$ exists in two isomeric forms $'A \ '$ and $'B \ '.$ Isomer $'A \ '$ reacts with $AgNO_3$ to give white precipitate but does not react with $BaCl_2.$ Isomer $ 'B \ '$ gives a white precipitate with $BaCl_2$ but does not react with $AgNO_3.$ Answer the following questions.
$i.$ Identify $'A \ '$ and $'B\ '$ and write their structural formulas.
$ii.$ Name the type of isomerism involved.
$iii.$ Give the $ \text{IUPAC}$ name of $'A\ '$ and $'B \ '.$
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Q 245 Marks Questions5 Marks
Attempt any five of the following$:$
$(a)$ Deficiency of which vitamin causes night$-$blindness.
$(b)$ Give two examples of reducing sugars.
$(c$) Define the following terms$:$
$i.$ Glycosidic linkage
$ii.$ Native protein
$(d)$ Write function of carbohydrates in plants.
$(e)$ Differentiate between$:$
$i.$ Peptide linkage and Glycosidic linkage
$ii.$ Nucleoside and Nucleotide
$(f)$ What type of linkage holds together the monomers of $ \text{DNA}?$
$(g$) Write the product obtained when $D-$glucose reacts with $H_2N-OH.$
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Q 254 Marks Questions4 Marks
Read the following text carefully and answer the questions that follow:
The boiling point elevation and the freezing point depression of solutions have a number of practical applications. Ethylene glycol $(CH_2OH$-$CH_2OH)$ is used in automobile radiators as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has a low vapour pressure. We can also use glycerol as an antifreeze. In order for boiling point elevation to occur, the solute must be non$-$volatile, but no such restriction applies to freezing point depression. For example, methanol $(CH_3OH),$ a fairly volatile liquid that boils only at $65^\circ C$ is sometimes used as antifreeze in automobile radiators.
$i.$ Out of the $CH_3OH$ and $C_6H_{12}O_6,$ which is a better reagent for depression in freezing point but not for elevation in boiling point?
$ii.$ Will the depression in freezing point be same or different, if $0.1 \ moles$ of sugar or $0.1 \ moles$ of glucose is dissolved in $1 L$ of water?
$iii. 124 g$ each of the two reagents glycerol and glycol are added in $5 \ kg$ water of the radiators in the two cars. Which one is better for a car? Justify your answer.
$OR$
$iiii.$ If the cost of glycerol, glycol and methanol are the same, then what would be the sequence of the economy to use these compounds as antifreeze?
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Q 264 Marks Questions4 Marks
Read the following text carefully and answer the questions that follow:
The actinoids include the fourteen elements from Th to$ Lr.$ The actinoids are radioactive elements and the earlier members have relatively long half$-$lives, the latter ones have half$-$life values ranging from a day to $3$ minutes for lawrencium. The latter members could be prepared only in nanogram quantities. Actinoids show a greater range of oxidation states. The elements, in the first half of the series frequently exhibit higher oxidation states. The actinoids resemble the lanthanoids in having more compounds in $+3$ state than in the $+4$ state. All the actinoids are believed to have the electronic configuration of $7s^2$ and variable occupancy of the $5f$ and $6d$ subshells. The magnetic properties of the actinoids are more complex than those of the lanthanoids. The variation in the magnetic susceptibility of the actinoids with the number of unpaired $5f$ electrons is roughly parallel to the corresponding results for the lanthanoid.
$i.$ Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
$ii.$ Actinoids show irregularities in their electronic configuration. Justify?
$iii.$ The actinoid metals are all silvery in appearance but display a variety of structures than lanthanoid give reason.
$OR$
$iii.$ The magnetic properties of the actinoids are more complex than those of the lanthanoids. Why?
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