Chemistry Test 184

Result

Chemistry Test 184

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Weekly Quiz Competition

Question 1
4 / -1

A
0.02 M

B
0.01 M

C
0.001 M

D
0.1 M

Solution
Question 2
4 / -1

The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at

A

B

C

D

Solution
Question 3
4 / -1

In which of the following arrangements, the order is NOT according to the property indicated against it?

A
Li < Na < K < Rb :
Increasing metallic radius

B
I < Br < F < Cl :
Increasing electron gain enthalpy
(with negative sign)

C
B < C < N < O
Increasing first ionization enthalpy

D
Increasing ionic size

Solution

In period the value of ionisation potential increases from left to right with breaks where the atoms have somewhat stable configuration. In this case N has half filled stable orbitals. Hence has highest ionisation energy. Thus the correct order is
B < C < O < N
And not as given in option (c)
Question 4
4 / -1

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2D). This is because

A
in NH₃ the atomic dipole and bond dipole are in the same direction whereas in NF₃ these are in opposite directions

B
in NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

C
in NH₃ the atomic dipole and bond dipole are in the opposite directions whereas in NF₃ these are in the same direction

D
in NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction

Solution
Question 5
4 / -1

Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is

A
1/2

B
2/3

C

D
1/3

Solution
Question 6
4 / -1

The enthalpy of vapourisation of water from the following two equations is

A
6.02 kJ

B
40.5 kJ

C
62.3 kJ

D
1.25 kJ

Solution
Question 7
4 / -1

A
AgCl

B
AgBr

C

D
AgI

Solution
Question 8
4 / -1

Which of the following chemical reactions depict the oxidizing beahviour of H₂SO₄?

A

B

C

D

Solution
Question 9
4 / -1

Which of the following terms is not correct for hydrogen?

A
Its molecule is diatomic.

B
It exists both as H+ and H– in different chemical compounds.

C
It is the only species which has no neutrons in the nucleus.

D
Heavy water is unstable because hydrogen is substituted by its isotope deuterium.

Solution

Heavy water is stable.
Question 10
4 / -1

Which of the following has lowest thermal stability?

A

B

C

D

Solution