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Which type of 'defect' has the presence of cations in the interstitial sites?

A) Schottky defect

B) Frenkel defect

C) Metal deficiency defect

D) Vacancy defect

Which of the following are Lewis acids?

A) $PH_{3}$ and $BCl_{3}$

B) $AlCl_{3}$ and $SiCl_{4}$

C) $BCl_{3}$ and $AlCl_{3}$

D) $PH_{3}$ and $SiCl_{4}$

Which of the following compounds contain(s) no covalent bond(s)?

KCl,PH₃,O₂,B₂H₆,H₂SO₄

A) $KCl,B_{2}H_{6},PH_{3}$

B) $KCl,H_{2}SO_{4}$

C) $KCl$

D) $KCl,B_{2}H_{6}$

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluroide ion is required to make teeth enamel harder by converting [3Ca₃(PO₄)₂.Ca (OH)₂] to

A) [$CaF_{2}$]

B) [$3(CaF_{2}).Ca(OH)_{2}$]

C) [$3Ca_{3}(PO_{4})_{2}.CaF_{2}$]

D) [3{$Ca_{3}(PO_{4})_{2}$}.$CaF_{2}$]

At 518° C, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363 Torr, was 1.00 Torr s^-1 when 5% had reacted and 0.5 Torr s^-1 when 33% had reacted. The order of the reaction is

A) 2

B) 3

C) 1

D) 0

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing pointt?

A) $[Co( H_{2}O)_{6}]Cl_{3}$

B) $[Co( H_{2}O)_{5}Cl]Cl_{2}.H_{2}O$

C) $[Co( H_{2}O)_{4}Cl_{2}]Cl_{}.2H_{2}O$

D) $[Co( H_{2}O)_{3}Cl_{3}].3H_{2}O$

The increasing order of basicity of the following compound is

A) $(I)<(II)<(III)<(IV)$

B) $(II)<(I)<(III)<(IV)$

C) $(II)<(I)<(IV)<(III)$

D) $(IV)<(II)<(I)<(III)$

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) [Atomic numbers : Fe=26, Ni= 28]

A) Total number of valence shell electrons at metal centre in $Fe (CO)_{5}$ or $Ni (CO)_{4}$ is 16

B) These are predominantly low spin in nature

C) Metal- carbon bond strengthens when the oxidation state of the metal is lowered

D) The carbonyl C-O bond weakens when the oxidation state of the metal is increased

Based on the compounds of group 15 elements, the correct statement(s) is (are)

A) $Bi_{2}O_{5}$ is more basic than $N_{2}O_{5}$

B) $N_{}F_{3}$ is more covalent than $Bi_{}F_{3}$

C) $P_{}H_{3}$ boils at lower temperature than $N_{}H_{3}$

D) The N-N single bond is stronger than the P-P single bond

Consider an ionic solid MX with NaCl structure. Construct a new structure (Z) whose unit cell is constructed from the unit cell of MX following the sequential instruction given below. Neglect the charge balance.

(a) Remove all the anions (X) except the central one.

(b) Replace all the face centered cations (M) by anions (X)

(d) Replace the central anion (X) with cation (M)

The value of ( Number of anions/ Number of cations ) in Z is ..............

A) 4

B) 5

C) 3

D) 2

Liquids A and B form ideal solution over the entire range of composition. At temperature T, equimolar binary solution of liquids A and B has vapour pressure 45 torr. At the same temperature , a new solution of A and B having mole fractions X_Aand X_B , respectively , has vapour pressure of 22.5 torr. The value of X_A/X_Bin the new solution is......... (Given that the vapour pressure of pure liquid A is 20 Torr at temperature T )

A) 17

B) 20

C) 19

D) 18

The solubility of salt of a weak acid (AB) at pH 3 is Y× 10^-3 mol L^-1. The value of Y is.........

[Given that the value of solubility product of AB (K_sp)=2× 10^-10 and the value of ionization constant of HB (K_a)=1× 10^-8]

A) 5

B) 4.47

C) 8.2

D) 3.8

The plot given below shows p-T curves (where p is the pressure and T is the temperature ) for two solvents X and Y and isolmolal solution of NaCl these solvents. NaCl completely dissociates in both the solvents

On the addition of the equal number of moles of a non -volatile S in equal amount (in kg) of these solvents, the elevation of boiling point X is three times that of solvent Y. Solute S is known to undergo dimerization in these solvents. If the degree of dimerization is 0.7 in solvent Y, the degree of dimerization in solvent X is...........

A) 0.05

B) 0.09

C) 0.01

D) 1

The total number of compounds having at least one bridging oxo group amoung the molecule given below...

N₂O₃ ,N₂O₅ ,P₄ O₆ , P₄O₇, H₄P₂O_5,H₅P₃O₁₀, H₂S₂O₃, H₂S₂O₅

A) 6

B) 8

C) 4

D) 2

To measure the quantity of Mncl₂ dissolved in an aqueous solution , it was completely converted to KMnO₄ using the reaction.

$MnCl_{2}+K_{2}S_{2}O_{8}+H_{2}O\rightarrow KMnO_{4}+H_{2}SO_{4}+HCl$

(equation not balanced)

Few drops of concentrated HCl were added to this solution and gently warmed. Further, oxalic acid (225 mg) was added in portions till the colour of the permanganatic ion disappeared. The quantity of MnCl₂ (in mg) present in the initial solution is........

[Atomic weights in g mol ^-1 : Mn =55, Cl= 35.5]

A) 128mg

B) 115mg

C) 126mg

D) 130mg

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