Chemistry Test 17

Result

Chemistry Test 17

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following atoms has the highest first ionization energy?

A
K

B
Sc

D
Rb

E
Na

Solution

The first ionization energy of d-block elements are greater than the first ionization energy of alkali metals.
Therefore, The order is
: Na : = 495.8 kJ/mol
IE₁ : Sc : = 631.0 kJ/mol
So, Scandium has highest ionization energy.
Question 2
4 / -1

Due to the presence of an unpaired electron, free radicals are

A
Chemically reactive

B
Chemically inactive

C
Anions

D
Cations

Solution

Due to the presence of an unpaired electron, free radicals are highly reactive
Question 3
4 / -1

In which of the following arrangements, the sequence is not strictly according to the property written against it?

A
CO₂ > SiO₂ < SnO₂ < PbO₂ : increasing oxidizing power

B
HF < HCl < HBr < HI : increasing acid strength

C
NH₃ < PH₃ < As H₃ < SbH₃ : increasing basic strength

D
B < C < O < N : increasing first ionization enthalpy

Solution

As the size of the central non-metal increasing appreciably, the basicity of hydride decreases.
Question 4
4 / -1

Among the following acids which has the lowest pKa value?

A
CH3COOH

B
HCOOH

C
(CH3)2COOH

D
CH3CH2COOH

Solution

HCOOH has the lowest PKa value.
Pka value of HCOOH = 3.75