JEE Advanced Mix Test 14

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JEE Advanced Mix Test 14

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Weekly Quiz Competition

Question 1
4 / -1

Select the correct statement (s)

A
CH₃ SiCl₃ under goes hydrolysis followed by inter molecular elimination of water to form a complex cross - linked polymer (i.e silicone).

B
Silicone fluids are thermally stable.

C
In two dimensional sheet silicate, three oxygen atoms of each tetrahedral are shared with adjacent SiO₄^4– tetrahedrals.

D
All are correct

Solution
Question 2
4 / -1

Statement-1 : The melting points of the various fluorides of xenon decrease in the order XeF₂ > XeF₄ > XeF₆.

Statement-2 : Xe – F bond length in XeF2, XeF4 and XeF6 decreases in the order XeF₂ > XeF₄ > XeF₆.

A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.

C
Statement-1 is True, Statement-2 is False.

D
None of these

Solution

S-1 : The melting point depends on the packing of the molecules. Symmetrical molecules are more closely packed as compared to unsymmetrical molecules. Hence symmetrical molecules will have higher melting points as compared to unsymmetrical molecules.

S-2 : This may be owing to the increase in charge on xenon atom with increasing number of F atoms.

XeF₂ XeF₄ XeF₆
2.00 1.95 1.89
Question 3
4 / -1

Statement-1 : Ethers behave as bases in the presence of mineral acids.

Statement-2 : It is due to the presence of lone pair of electrons on the oxygen atom.

A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.

C
Statement-1 is True, Statement-2 is False.

D
Statement-1 is False, Statement-2 is True.

Solution
Question 4
4 / -1

The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

A
1 and 4

B
1 and 3

C
1 and 2

D
2 and 3

Solution

Basic strength of the oxides increase in the order Li₂O < Na₂O < K₂O < Rb₂O < Cs₂O. The increase in basic strength is due to the decrease in I.E. and increase in electropositive character.The melting points of the halides decrease in the order NaF > NaCl > NaBr > NaI, as the size of the halide ion increases. The decrease in melting point is due to increase the covalent character with increase in the size of anion according to Fajan's rule.
Question 5
4 / -1

The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

Which of the following acts as an oxidising as well as reducing agent ?

A
Na₂O

B
NaO₃

C
NaOH

D
NaNO₂

Solution

NaNO2 (sodium nitrite) acts both as oxidising agent and reducing agent because the nitrogen atom in it is in +3 oxidation state (+3 is intermediate oxidation state for nitrogen)

Oxidising property : 2NaNO₂ + 2KI + 2H₂SO₄→ NaSO₄ + K₂SO₄ + 2NO + 2H₂O + I₂

Reducing property : NaNO₂ + H₂O₂ → NaNO₃ + H₂O.
Question 6
4 / -1

The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by-products are:

A
Cl₂ and H₂

B
Cl₂ and Na-Hg

C
Cl₂ and NaCl

D
Cl₂ and O₂

Solution
Question 7
4 / -1

Match the entries in Column I with the correctly related characteritic(s) in Column II.

A
(A) → r ; (B) → p, s ; (C) → q ; (D) → p.,r

B
(A) → s ; (B) → q, s ; (C) → p,t ; (D) → p

C
(A) → q , r, s ; (B) → r , s ; (C) → p ; (D) → t

D
(A) → t ; (B) → p ; (C) → r, s ; (D) → q , r, s

Solution

(A) Two oxygen atoms per tetrahedron are shared forming rings. They have general formula (SiO₃)_n^2n-.
Be₃Al₂[Si₆O₁₈], beryl.
(B) Two oxygen atoms per tetrahedron are shared forming a chain of tetrahedron. They have general
formula (SiO₃)_n^2n-.
(C) One oxygen atom per tetrahedron is shared. They have general formula Si₂O₇^2- . Thortveitite.
(D) Three oxygen atoms per tetrahedron are shared. They have general formula (Si₂O₅)_n^2- .
Mica (muscovite).
Question 8
4 / -1

From a point P(1, 2) pair of tangent’s are drawn to a hyperbola ‘H’ in which one tangent to each arm of hyperbola. Equation of asymptotes of hyperbola H are √3x – y + 5 = 0 & √3x + y – 1 = 0 then eccentricity of ‘H’ is

A
2

B

C

D

Solution
Question 9
4 / -1

Length of latus rectum of parabola which touches the line 3x + 4y + 7 = 0 having focus at (2, 3) and tangent at vertex passes through a point (1, 1), is

A

B

C

D

Solution
Question 10
4 / -1

An ellipse whose focii are (2, 4) & (14, 9) and touches x-axis then its eccentricity is

A

B

C

D
1/13

Solution