Correct Answer: C) 0.4

Explanation

The given question is related to the electrolysis of aluminum. To calculate the current required to deposit 0.27g of aluminum in 2 hours, we need to use Faraday's laws of electrolysis.

First, we need to find the number of moles of aluminum deposited:

Moles of aluminum = mass / molar mass = 0.27g / 27g/mol = 0.01 moles

Now we need to find the charge required to deposit 0.01 moles of aluminum:

1 mole of aluminum requires 3 moles of electrons, as aluminum has a valency of +3. So, 0.01 moles of aluminum will require 0.03 moles of electrons.

The charge required to deposit 0.01 moles of aluminum can be calculated using the Faraday constant (F) which relates the charge (Q) to the amount of substance (n) in moles and the number of electrons per mole:

Q = n * F

Q = 0.03 moles * 96500C/mol = 2895C

Now we need to find the current (I) required to deposit 0.27g of aluminum in 2 hours:

Current (I) = Charge (Q) / Time (t)

Time (t) = 2 hours = 7200 seconds (since 2 hours * 60 minutes/hour * 60 seconds/minute = 7200 seconds)

I = 2895C / 7200s = 0.4021A ? 0.4A

Therefore, the correct answer is Option C: 0.4A. The other options are incorrect because they do not represent the correct current required to deposit 0.27g of aluminum in 2 hours.

Correct Answer: A. reactivity and oxidation respectively

Explanation

Copper is not active enough to replace hydrogen in an acid. Also, nitric acid is a strong oxidizing agent which quickly oxidises hygrogen to water.

Correct Answer: B) carbon (IV) oxide

Explanation

a. A transition element is one which has incompletely filled d-orbitals.

bi. B

ii. C

c. Across a period(from left to right) there is a gradual increase in the number of protons in the nucleus/effective nuclear-charge.

This increases the force of attraction between the nucleus and the electrons hence more energy is needed to remove the outermost electron.

d. -methane

-ethene

-ethyne

-ethanol

-ethanoic acid

e. -Alkanols are formed by replacing one hydrogen of water by an alkyl group

-Alkyl groups have a positive inductive effect/ are electron releasing/electron donating

-This increases the electron density of the oxygen

f. -NaCl

-CaCO3

-NH3

-C

g. Geometric isomerism is the existence of two compounds with the same molecular formula but differ in the arrangement of groups attached to the carbon-containing double bond

h. This is because constituents of water gases(CO and H2)are both combustible and give a higher calorific/heat value than producer gas

i. It is defined as the heat change/released when 1 mole of a substance is burnt in excess oxygen.

OR It is defined as the heat change/released when 1 mole of a substance is completely burnt in air

ji. When the same quantity of electricity is passed through different electrolytes, the relative number of moles of the elements discharged is inversely proportional to the charges on the ions of the element.

ii. 96500 C liberates 1.0 mol of Ag(s)

10920 C will liberate 10920/96500

=0.113 mole

Correct Answer: A) CFCs

Correct Answer: C) alkanols

Correct Answer: A) NaHSO₄

Correct Answer: B. K₂CO₃

Explanation

(a) Reactions of chlorine with KI and Zn.

(i) Cl\(_2\) + 2Kl --> 2KCI + l\(_2\)

(ii) Cl\(_2\) + Zn \(\to\) ZnCl\(_2\)

(b) NaCIO or sodium oxochlorate (I) is the product represented by Q in the given equation.

Correct Answer: C) D orbital