11.

When 0.2 g of 1-butanol was burnt in a suitable apparatus, the heat evolved was sufficient to raise the temperature of 200 g water by 5°C. The enthalpy of combustion of 1-butanol in kcal mol^-1 will be

• +37

• +370

• -370

• -740

Given that dE = Tds - pdV and H = E + pV. Which one of the following relations is true ?

• dH = TdS + Vdp

• dH = SdT + Vdp

• dH = -SdT + Vdp

• dH = dE + pdV

When 200 mL of aqueous solution of HCl (pH = 2) is mixed with 300 mL of an aqueous solution of NaOH (pH = 12) the pH of the resulting mixture is

• 10

• 2.7

• 4.0

• 11.3

At a certain temperature, the dissociation constants of formic acid and acetic acid are 1.8 × 10^-4 and 1.8 × 10^-5 respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to 

• 0.01 M

• 0.001 M

• 0.1 M

• 0.0001 M

In acid medium, Zn reduces nitrate ion to NH${}_4^{+}$ ion according to the reaction,

Zn + NO${}_3^{-}$→ Zn²⁺ + NH${}_4^{+}$ + H₂O (unbalanced).

How many moles of HCl are required to reduce half a mole of NaNO₃ completely ? Assume the availability of sufficient Zn.

• 5

• 4

• 3

• 2

Match List-I and List-II and choose the correct matching codes.

• A - 6; B - 4; C - 1; D - 2; E - 3

• A - 2; B - 4; C - 1; D - 6; E - 3

• A - 2; B - 4; C - 1; D - 6; E - 5

• A - 6; B - 4; C - 1; D - 2; E - 5

What is the overall formation equilibriumconstant for the ion [ML₄]^2- ion, given that β₄ for this complex is 2.5 × 10¹³?

• 2.5 × 10¹³

• 5 × 10^-13

• 2.5 × 10^-14

• 4.0 × 10^-13

In which of the following species, all the three types of hybrid carbons are present ?

• CH₂=C=CH₂

• CH₃-CH=CH-CH${}_2^{+}$

• CH₃-C≡C-CH${}_2^{+}$

• CH₃-CH=CH-CH${}_2^{-}$

Which one of the following pairs of substances will not produce hydrogen when reacted together?

• Copper and conc. nitric acid

• Ethanol and metallic sodium

• Magnesium and steam

• Phenol and metallic sodium

A compound in which a metal ion M^x+ (Z = 25) has a spin only magnetic moment of $\sqrt{24}$ BM. The number of unpaired electrons in the compound and the oxidation state of the metal ion are respectively

• 4 and 2

• 5 and 3

• 3 and 2

• 4 and 3