Chemistry Test

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Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinity.

(i) 2s², 2p⁵

(ii) 3s², 3p⁵

(iii) 2s², 2p⁴

(iv) 3s², 3p⁴

A
(i) < (ii) < (iv) < (iii).

B
(ii) < (i) < (iv) < (iii)

C
(i) < (iii) < (iv) < (ii)

D
(iii) < (iv) < (i) < (ii)

Solution

Correct Answer : (iii) < (iv) < (i) < (ii)
Question 2
1 / -0

Which one of the following has greatest mass?

A
electron

B
proton

C
neutron

D
hydrogen nucleus.

Solution

Mass of proton is 1.672621777(74) × 10⁻²⁷kg. An electron has a mass (9.10938291(40) × 10⁻³¹ kg) that is approximately 1 / 1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 × 10⁻²⁷ kg. The heaviest of these particles is the neutron.
Question 3
1 / -0

The ash formed from burning of a Magnesium ribbon is ______ in colour.

A
Pink

B
Red

C
Yellow

D
White.

Solution

When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a material in which atoms of different elements are bonded to one another. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide.

2Mg(s)+O2(g)→2MgO(s)+energy
Question 4
1 / -0

The atomic number of an element is the number of ?

A
Protons

B
Electrons + Protons

C
Neutrons

D
Neutrons + Protons

Solution

Atomic number is the number of electrons or protons.
Question 5
1 / -0

J J Thomson is credited with the discovery of ?

A
Electron

B
Proton

C
Neutron

D
Neutrino

Solution

Sir Joseph John Thomson OM PRS (18 December 1856 – 30 August 1940) was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered.
Question 6
1 / -0

A beam of 35.0 keV electrons strikes a molybdenum target, generating the X-rays. What is the cutoff wavelength?

A
35.5 pm

B
40.0 pm

C
15.95 pm.

D
18.2 pm

Solution

The cut-off wavelength \(\lambda_{\text {min }}\) corresponds to an electron transferring (approximately) all of its energy to an \(X-\)ray photon, thus producting a photon with the greatest possible frequency and least possible wavelength. From relation \(\lambda_{\min }=\frac{h c}{K_{0}}=\frac{\left(4.14 \times 10^{-5}\right)\left(3 \times 10^{8}\right)}{35.0 \times 10^{3}}\)
\(=3.55 \times 10^{-11} m=35.5 \) Pm
Question 7
1 / -0

Which of the following compounds is also known as picric acid?

A
2–Hydroxy–1, 2, 3, 5–tribromobenzene

B
1–Hydroxy–2, 4, 6–trinitrobenzene

C
2, 4, 6–trinitrophenol.

D
Sym–tribromophenol

Solution

Correct Answer : 2, 4, 6–trinitrophenol

Picric acid is an organic compound with the formula (O2N)3C6H2OH. Its IUPAC name is 2,4,6-trinitrophenol (TNP). The name "picric" comes from the Greek word πικρός (pikros), meaning "bitter", due to its bitter taste. It is one of the most acidic phenols
Question 8
1 / -0

Where does the oxygen that keeps us alive come form?

A
Carbon dioxide

B
Carbonates absorbed from soil

C
Oxides of minerals.

D
Water

Solution

Since water and carbon dioxide are both compounds which contain oxygen, it is possible to obtain oxygen from either. The oxygen produced from photosynthesis is not released into the air. It is not until cellular respiration that oxygen is released. the oxygen comes from water. The water molecules are split at the “beginning” of photosynthesis for the electrons. These electrons eventually make their way to the electron transport chain, where oxygen is the final electon accept, and then released into the air. Scientists agree that there’s oxygen from ocean plants in very breath we take. Most of this oxygen comes from tiny ocean plants – called phytoplankton-that live near the water’s surface and drift with the currents. Like all plants, they photosynthesize-that is, they use sunlight and carbon dioxide to make food. A byproduct of photosynthesis is oxygen.
Question 9
1 / -0

Oxidation number of sodium in sodium amalgam is ______ .

A
+1

B
0

C
-1

D
+2

Solution

Sodium amalgam is a homogeneous mixture of Na and Hg and as such Na exists in the elemental state and hence its O.N is zero.
Question 10
1 / -0

At very high pressure a real gas, as compared to an ideal gas, occupies?

A
same volume

B
less volume

C
more volume

D
Any of these

Solution

At very high pressure a real gas, as compared to an ideal gas, occupies less volume

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Chemistry Test - 4

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Chemistry Test - 4

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Question 1

(i) < (ii) < (iv) < (iii).

(ii) < (i) < (iv) < (iii)

(i) < (iii) < (iv) < (ii)

(iii) < (iv) < (i) < (ii)

Solution

Question 2

electron

proton

neutron

hydrogen nucleus.

Solution

Question 3

Pink

Red

Yellow

White.

Solution

Question 4

Protons

Electrons + Protons

Neutrons

Neutrons + Protons

Solution

Question 5

Electron

Proton

Neutron

Neutrino

Solution

Question 6

35.5 pm

40.0 pm

15.95 pm.

18.2 pm

Solution

Question 7

2–Hydroxy–1, 2, 3, 5–tribromobenzene

1–Hydroxy–2, 4, 6–trinitrobenzene

2, 4, 6–trinitrophenol.

Sym–tribromophenol

Solution

Question 8

Carbon dioxide

Carbonates absorbed from soil

Oxides of minerals.

Water

Solution

Question 9

+1

0

-1

+2

Solution

Question 10

same volume

less volume

more volume

Any of these

Solution

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