Chemistry

The number of stereoisomers formed in a reaction of

$(\pm) P h (C = O) C (O H) (C N) P h w i t h H C N i s____________.$

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A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344mL of H₂ gas at STP. The number of alcoholic hydrogens present in compound 'X' is_________.

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Mole of polyhydric alcohol = $\frac{1.84 * 1 0^{- 3}}{92} = 2.0 * 1 0^{- 5} m o l e .$

Mole of H₂ gas produced = $\frac{1.344}{22400} = 6.0 * 1 0^{- 5} m o l e .$

No of OH gp present = $\frac{6.0 * 1 0^{- 5}}{2.0 * 1 0^{- 5}} = 3$

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Consider the following sulphur based oxoacids.

H₂SO₃, H₂SO₄, H₂S₂O₈ and H₂S₂O₇.

Amongst these oxoacids, the number of those with peroxo (O-O) bond is______________.

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Chemistry Chemistry Coordination Compounds

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Only H₂S₂O₈ has per-oxo bond.

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Sum of oxidation state (magnitude) and coordination number of cobalt in $N a [C o (b p y) C l_{4}]$ is___________.

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Oxidation state of Co = 3

And co-ordination No = 6

Sum = 3 + 6 = 9

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Assuming 1 $μ g$ of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is __________* 10^-1 $μ g$

[Given: In 10 = 2.303; log 2 = 0.30]

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$λ t = l n \frac{N_{o}}{N_{t}}$

$\frac{0.693}{t_{1 / 2}} * t = l n \frac{1}{N_{t}}$

Or $\frac{0.693 * 100}{30} = l n \frac{1}{N_{t}}$

$\frac{1}{N_{t}} = 10$

$∴ N_{t} = \frac{1}{10} = 0.1$

Or N_t = 1 * 101 $μ g$

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1.80g of solute A was dissolved in 62.5cm³ of ethanol and freezing point of the solution was found to be 155.1 K . The molar mass of solute A is __________g mol^-1.

[Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g cm^-3. Freezing point depression constant of ethanol is 2.00 K kg mol^-1]

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Contributor-Level 10

$Δ T_{f} = K_{f} * m$

$(156 - 155.1) = 2 * \frac{1.8}{M W} * \frac{1000}{(62.5 * 0.8)}$

0.9 = $\frac{2 * 1.8 * 1000}{M W * 50}$

$∴ M W = 80 g m / m o l$

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Consider, PF₅, BrF₅, PCl₃, SF₆, ${[I C l_{4}]}^{-}$ , CIF₃ and IF₅.

Amongst the above molecule(s) / ion(s), the number of molecule(s) / ion(s) having sp³d² hybridisation is_____________.

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Following have the sp³d² hybridisation

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'x' g of molecular oxygen(O₂) is mixed with 200g of neon (Ne). The total pressure of the non-reactive mixture of O₂ and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of 'x' is_________.

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Po₂ = P_Total - $P_{N_{2}}$

= 25 – 20 = 5bar

Po₂ = $\frac{n_{O_{2}}}{n_{O_{2}} + n_{N e}} * P_{T o t a l}$

$5 = (\frac{x / 32}{x / 32 + \frac{200}{20}}) * 25 \Rightarrow x = 80 g m$

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If O₂ gas is bubbled through water at 303 K, the number of millimoles of O₂ gas that dissolve in 1 litre of water is______________. (Nearest integer)

(Given: Henry’s Law constant for O₂ at 303 K is 46.82 k bar and partial pressure of O₂ = 0.920 bar)

(Assume solubility of O₂ in water in too small, nearly negligible)

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When 600 mL of 0.2 M HNO₃ is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is_________ * 10^-² °C.

(Enthalpy of neutralization = 57 kJ mol^-¹ and Specific heat of water = 4.2 JK^-¹ g^-¹)

(Neglect heat capacity of flask)

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