171.

The calculated magnetic moment (in Bohr magnetons of Cu²⁺ ion is)

• 1.73

• zero

• 2.6

• 3.4

Which one of the following molecules contain both ionic and covalent bonds?

• CH₂Cl₂

• K₂SO₄

• BeCl₂

• SO₂

What is the hybridization state of the central atom in the conjugate base of NH${}_4^{+}$ ion?

• sp

• sp³

• sp²

• dsp²

If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the percent ionic character of the bond ?

• 10.66

• 12.33

• 16.66

• 19.33

Which of the following is not correct regarding the properties of ionic compounds?

• Ionic compounds have high melting and boiling points

• Their reaction velocity in aqueous medium is very high

• Ionic compounds in their molten and aqueous solutions do not conduct electricity

• They are highly soluble in polar solvents

Match the following lists:

List - I	List - II
A. Ethane	1. sp carbons
B. Ethylene	2. 6 sp2 carbons
C. Acetylene	3. 2 sp3 carbons
D. Benzene	4. 2 sp2 carbons 5. 1 sp and 1 sp2 carbons

• A - 3; B - 4; C - 1; D - 2

• A - 4; B - 5; C - 3; D - 2

• A - 3; B - 1; C - 2; D - 5

• A - 2; B - 3; C - 4; D - 5

The number of oxygen atoms bonded to one phosphorous atom in P₄O₆ is

• 4

• 3

• 6

• 5

Which of the following has S - S bond?

• H₂S₂O₆

• H₂S₂O₇

• H₂S₂O₈

• Mustard gas

Which of the following pair of ions have same paramagnetic moment?

• Cu²⁺, Ti³⁺

• Mn²⁺, Cu²⁺

• Ti⁴⁺, Cu²⁺

• Ti³⁺, Ni²⁺

Average C-H bond energy is 416 kJ mol^-1. Which of the following is correct?

• CH₄ (g) + 416 kJ → C (g) + 4H (g)

• CH₄ (g) → C (g) + 4H (g) + 416 kJ

• CH₄ (g) + 1664 kJ → C (g) + 4H (g)

• CH₄ (g) → C (g) + 4H (g) + 1664 kJ