41.

If Z is the number of atoms in the unit cell that represents the closest packing sequence... A B C A B C..., the number of tetrahedral voids in the unit cell is equal to

• Z

• 2Z

• Z/2

• Z/4

For reaction aA → xP, when [A] = 2.2 mM, the rate was found to be 2.4 mM s^-1. On reducing concentration of A to half, the rate changes to 0.6 mM s^-1. The order of reaction with respect to A is

• 1.5

• 2.0

• 2.5

• 3.0

Assertion : Reaction of SO₂ and H₂S in the presence of Fe₂O₃ catalyst gives elemental sulphur.

Reason : SO₂ is a reducing agent.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : SiF₆^2- is known but SiCl₆^2- is not.

Reason : Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Addition of NH₄OH to an aqueous solution of BaCl₂ in the presence of NH₄Cl (excess) precipitates Ba(OH)₂.

Reason : Ba(OH)₂ is insoluble in water.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.

Reason : Water is polar and benzene is non-polar.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Galvanised iron does not rust.

Reason : Zinc has a more negative electrode potential than iron.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke.

Reason : The reaction Fe₂O_{3 (s)} → Fe _(s) + $\frac{3}{2}$O_{2 (g)} is a spontaneous process.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

The major product formed in the following reaction is

• (CH₃)₂CH-CH₂OCH₃

• CH₃-CH(OCH₃)-CH₂CH₃

• CH₃-C(CH₃)=CH₂

• (CH₃)₂-C-OCH₃- CH₃

The major product obtained on treatment of CH₃CH₂CH(F)CH₃ with CH₃O/CH₃OH is

• CH₃CH₂CH(OCH₃)CH₃

• CH₃CH = CHCH₃

• CH₃CH₂CH = CH₂

• CH₃CH₂CH₂CH₂OCH₃