Chemistry Test - 2

Total number of electrons in the molecule = Number of electrons of carbon atom + 2(number of electrons of oxygen atom)

= 6 + 2(8) = 22

The following set of quantum numbers is possible for an electron in a 4f orbital:

n = 4

l = 3

m = -3, -2, -1, 0, 1, 2, 3

s = +1/2 or -1/2

Hence, option (4) is correct.

The first goes from 3^rd Bohr orbit to the 2^nd Bohr orbit, so the 3^rd line will be on the transition from 5^th Bohr orbit to the 2^nd Bohr orbit.

3d electrons having s = +1/2 can have the following values of magnetic quantum number.

(-2, -1, 0, +1, +2)

Therefore, option (1) is the correct answer.

B.O. of O₂ = 1/2 [10 - 6] = 2; Paramagnetic

B.O. of O₂⁺= 1/2 [10 - 5] = 2.5; Paramagnetic

SiF₄ is tetrahedral as it contains 4 bond pairs and no lone pair.

SF₄ has a see-saw structure as it has 4 bond pairs and 1 lone pair.

Hence, SiF₄ and SF₄ are NOT isostructural.

Hence , options (A ) is the correct answer.

SiCl4 has 4 bond pairs and no lone pair, so it has a tetrahedral structure. 

The electrophilic substitution reaction that takes place between ethanoyl chloride and benzene is called as Friedel Crafts reaction.

The Friedel-Crafts reactions are a set of reactions developed by Charles Friedel and James Crafts in 1877 to attach substituents to an aromatic ring. Friedel-Crafts reactions are of two main types: alkylation reactions and acylation reactions. Both proceed by electrophilic aromatic substitution.

NH₄Cl is equivalent to NH₄⁺ and Cl^-

NH₄⁺ has 7 e^- of nitrogen and 3 e^- of hydrogen as 1 hydrogen is devoid of e^-.

Cl^- has 18 e^-

so in total = 7 + 3 + 18 = 28 e^-

Except NO₂, all other compounds have linear structure similar to CO₂.

$N{O}_2$ Has trigonal planar geomertry

Hence, the correct answer is an option ( D).

ΔH (Rhombic) – ΔH  (Monoclinic) = – 70960 – (– 71030) = – 70960 + 71030 = + 70 calories

Standard heat of formation (ΔH_f⁰)of methane is represented by

C (graphite) + 2H2(g) →CH4(g)

If ∆H/∆T is the same for in case of SO₂ (g) and SO₂Cl₂ (g), then change in entropy is related to the molar mass of a substance. Entropies generally increase with molecular weight. Thus, SO₂Cl₂(g) has greater entropy.

For gases,

dQ = dE + W

W = P. V

At a constant volume, W = 0

⇒ dQ = dE

It is the energy needed to create the system, but excludes the energy to displace the system's surroundings, any energy associated with a move as a whole, or due to external force fields. So it does not include energy arising out of gravitational pull.