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Chemistry

Given below are two statements:
Statement I: \( \mathrm{S}_8 \) solid undergoes disproportionation reaction under alkaline conditions to form \( \mathrm{S}^{2-} \) and \( \mathrm{S}_2\mathrm{O}_3^{2-} \).
Statement II: \( \mathrm{ClO}_4^{-} \) can undergo disproportionation reaction under acidic condition.
In the light of the above statements, choose the most appropriate answer from the options given below:

62.

Which of the following is least ionic?

63.

The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. \( 19 \)) are:

64.

Identify major product ‘P’ formed in the following reaction.

65.

The azo-dye (Y) formed in the following reaction is.
Sulphanilic acid + \( \text{NaNO}_2 \) + \( \text{CH}_3\text{COOH} \) \( \rightarrow \) X.

66.

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flower is:

67.

Identify the name reaction.

68.

Major product of the following reaction is:

69.

The correct order of reactivity in electrophilic substitution reaction of the following compounds is:

70.

Select the option with correct property:

71.

Given below are two statements:
Statement I: Aniline reacts with con. \( \mathrm{H_2SO_4} \), followed by heating at \( 453\text{–}473 \, \mathrm{K} \) gives p-aminobenzene sulphonic acid, which gives blood red colour in the ‘Lassaigne’s test’.
Statement II: In Friedel–Craft’s alkylation and acylation reactions, aniline forms salt with the \( \mathrm{AlCl_3} \) catalyst. Due to this, nitrogen of aniline aquires a positive charge and acts as deactivating group.
In the light of the above statements, choose the correct answer from the options given below:

72.

\( \mathrm{A(g)} \rightleftharpoons \mathrm{B(g)} + \dfrac{\mathrm{C}}{2}(g) \). The correct relationship between \( K_p \), \( \alpha \) and equilibrium pressure \( P \) is:

73.

Consider the following elements.

Which of the following is/are true about \( A', B', C' \) and \( D' \)?
\((A)\) Order of atomic radii: \( B' < A' < D' < C' \)
\((B)\) Order of metallic character: \( B' < A' < D' < C' \)

\((C)\) Size of the element: \( D' < C' < B' < A' \)

\((D)\) Order of ionic radii: \( B'^{+} < A'^{+} < D'^{+} < C'^{+} \)

74.

Identify \( A \) and \( B \) in the following reaction sequence.

75.

Given below are two statements:
Statement I: Group \( 13 \) trivalent halides get easily hydrolyzed by water due to their covalent nature.
Statement II: \( \mathrm{AlCl_3} \) upon hydrolysis in acidified aqueous solution forms octahedral \( [\mathrm{Al(H_2O)_6}]^{3+} \) ion.
In the light of the above statements, choose the correct answer from the option below:

76.

Identify structure of \( 2,3 \)-dibromo-\( 1 \)-phenylpentane.

77.

Choose the correct statements from the following.
A \( \mathrm{Mn_2O_7} \) is an oil at room temperature
B \( \mathrm{V_2O_4} \) reacts with acid to give \( \mathrm{VO_2^{2+}} \)
C \( \mathrm{CrO} \) is a basic oxide
D \( \mathrm{V_2O_5} \) does not react with acid
Choose the correct answer from the options given below:

78.

Match List I with List II

List I (Complex ion)	List II (Electronic Configuration)
A. \( [\mathrm{Cr(H_2O)_6}]^{3+} \)	I. \( t_{2g}{^{2}}e_{g}{^{0}} \)
B. \( [\mathrm{Fe(H_2O)_6}]^{3+} \)	II. \( t_{2g}{^{3}}e_{g}{^{0}} \)
C. \( [\mathrm{Ni(H_2O)_6}]^{2+} \)	III. \( t_{2g}{^{3}}e_{g}{^{2}} \)
D. \( [\mathrm{V(H_2O)_6}]^{3+} \)	IV. \( t_{2g}{^{6}}e_{g}{^{2}} \)

Choose the correct answer from the options given below:

79.

Choose the correct statement from the following.
A All group \( 16 \) elements form oxides of general formula \( \mathrm{EO_2} \) and \( \mathrm{EO_3} \) where \( \mathrm{E = S,\; Se,\; Te\; and\; Po} \). Both the types of oxides are acidic in nature.
B \( \mathrm{TeO_2} \) is an oxidising agent while \( \mathrm{SO_2} \) is reducing in nature.
C The reducing property decreases from \( \mathrm{H_2S} \) to \( \mathrm{H_2Te} \) down the group.
D The ozone molecule contains five lone pairs of electrons.
Choose the correct answer from the option given below:

80.

A sample of \( \mathrm{CaCO_3} \) and \( \mathrm{MgCO_3} \) weighed \( 2.21 \, \text{g} \) is ignited to constant weight of \( 1.152 \, \text{g} \). The composition of mixture is:
(Given molar mass in \( \text{g mol}^{-1} \) \( \mathrm{CaCO_3} : 100, \; \mathrm{MgCO_3} : 84 \))

81.

If \( 5 \) moles of an ideal gas expands from \( 10 \, \text{L} \) to a volume of \( 100 \, \text{L} \) at \( 300 \, \text{K} \) under isothermal and reversible condition then work, \( w \), is \( -x \) J. The value of \( x \) is ________.
(Given \( R = 8.314 \; \text{J K}^{-1} \text{mol}^{-1} \))

82.

From the vitamins \( A, B_1, B_6, B_{12}, C, D, E \) and \( K \), the number of vitamins that can be stored in our body is _________.

83.

Number of moles of \( \mathrm{H^+} \) ions required by \( 1 \) mole of \( \mathrm{MnO_4^-} \) to oxidise oxalate ion to \( \mathrm{CO_2} \) is ________.

84.

The molarity of \( 1 \, \text{L} \) orthophosphoric acid \( (\mathrm{H_3PO_4}) \) having \( 70\% \) purity by weight (specific gravity \( 1.54 \, \text{g cm}^{-3} \)) is _______ \( \text{M} \).
(Molar mass of \( \mathrm{H_3PO_4} = 98 \, \text{g mol}^{-1} \))

85.

A diatomic molecule has a dipole moment of \( 1.2 \, \text{D} \). If the bond distance is \( 1 \,\mathring{\text{A}} \), then fractional charge on each atom is ________ \( \times 10^{-1} \) esu. (Given \( 1 \, \text{D} = 10^{-18} \) esu cm)

86.

The value of conductivity of some materials at \( 298.15 \, \text{K} \) in \( \text{S m}^{-1} \) are \( 2.1 \times 10^{3} \), \( 1.0 \times 10^{-16} \), \( 1.2 \times 10 \), \( 3.191 \), \( 1.5 \times 10^{-2} \), \( 1 \times 10^{-7} \), \( 1.0 \times 10^{3} \). The number of conductors among the materials is ________.

87.

\( r = k[A] \) for a reaction, \( 50\% \) of \( A \) is decomposed in \( 120 \) minutes. The time taken for \( 90\% \) decomposition of \( A \) is ______ minutes.

88.

Number of isomeric products formed by monochlorination of \( 2 \)-methylbutane in presence of sunlight is _________.

89.

A compound \( (x) \) with molar mass \( 108 \, \text {g} \) \({mol^{-1}} \) undergoes acetylation to give product with molar mass \( 192 \, \text {g} \) \({mol^{-1}} \). The number of amino groups in the compound \( (x) \) is ______.

90.

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is \( (+) \) ________.

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Mathematics Physics Chemistry

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