Chemistry

📆 October 28, 2024

Total Questions: 69

21. What is the atomic mass of Zirconium? [S.S.C. Online Graduate Level (T-1) 6.03.2020]

(a) 88.22
(b) 91.22
(c) 89.22
(d) 90.22

Correct Answer: (b) 91.22

Solution:Zirconium is a group 4 (d-block) chemical element with an atomic number 40 and mass number 91.22.

22. Which of the following is false? [S.S.C. Online CHSL (T-I) 8.02.2017]

(a) Hydrogen atom is roughly a third of the mass of Tritium
(b) Deuterium is called heavy Hydrogen
(c) Deuterium atom has 1 neutron
(d) Protium is the rarest isotope of Hydrogen

Correct Answer: (d) Protium is the rarest isotope of Hydrogen

Solution:Among the given options, the option (d) statement is incorrect because protium is not a rare isotope of hydrogen. Hydrogen is the only element whose isotopes have different names independent of their name. D and T symbols are used for this. Hydrogen has three isotopes, which are easily obtained- Protium (¹

H₁

), deuterium (²H

₁

), and tritium (³H

₁

23. Which fundamental particle is not present in the nucleus of a hydrogen atom? [S.S.C. Online MTS (T-I) 20.09.2017]

(a) Electron
(b) Proton
(c) Neutron
(d) None of these

Correct Answer: (c) Neutron

Solution:The fundamental particle that is not present in the nucleus of the most common isotope of a hydrogen atom (Protium) is the Neutron.

The nucleus of a Protium atom (

H₁

) consists of only one proton.
It has one electron orbiting the nucleus.
It has zero neutrons.

24. Which of the following is a radio isotope of the hydrogen? [S.S.C. Online CPO SI (T-I) 10.11.2022]

(a) Xenon
(b) Technetium
(c) Thorium
(d) Tritium

Correct Answer: (d) Tritium

Solution:

The radioactive isotope of hydrogen among the options is Tritium.

Tritium ( $H₃$ ) has one proton and two neutrons in its nucleus. This unstable neutron-to-proton ratio causes it to undergo radioactive decay, emitting a beta particle.

25. The nucleus of the hydrogen atom is called as- [S.S.C. Online MTS (T-I) 17.09.2017]

(a) Neutron
(b) Elect
(c) Proton
(d) Positron

Correct Answer: (c) Proton

Solution:A hydrogen atom has only one proton in its nucleus and one electron in its orbit. When hydrogen gives up this one electron, the nucleus remains, which is made up of a single proton. Hence the nucleus of the hydrogen atom is called proton.

26. Atomic number of which of the following elements is greater than that of Fluorine? [S.S.C. Online CHSL (T-I) 21.01.2017]

(a) Sodium
(b) Beryllium
(c) Nitrogen
(d) Boron

Correct Answer: (a) Sodium

Solution:The atomic number of all the give elements are as follows:

Element	Atomic Number
Sodium	11
Beryllium	4
Nitrogen	7
Boron	5
Fluorine	9

Therefore, the atomic number of sodium is higher than that of fluorine.

27. Which among the following is present inside the nucleus of an atom? [S.S.C. Online CHSL (T-I) 7.01.2017]

(a) Protons and Neutrons
(b) Electrons and Protons
(c) Neutrons and Electrons
(d) Neutrons, Protons, Electrons

Correct Answer: (a) Protons and Neutrons

Solution:From the basic particles protons, neutrons, and electrons, only protons and neutrons are located in the nucleus, while electrons reside outside the nucleus in orbits around the nucleus. Protons and electrons are positively charged and negatively charged particles respectively, whereas electrically neutral neutrons (without charge) particles.

28. Atomic number of an atom gives the number of which of the following? [S.S.C. Online Graduate Level (T-I) 8.09.2016]

(a) electrons
(b) protons
(c) neutrons
(d) neutrons and protons

Correct Answer: (b) protons

Solution:

The atomic number of an atom gives the number of protons.

The atomic number (Z) is defined as the number of protons in the nucleus of an atom. This number uniquely identifies an element.In a neutral atom, the number of protons is also equal to the number of electrons.However, the defining characteristic of an element's atomic number is its proton count. The number of neutrons can vary (leading to isotopes), and the number of electrons can change (leading to ions).

29. Atomic number of which of the following elements is greater than that of Iron? [S.S.C. Online CHSL (T-I) 3.02.2017]

(a) Manganese
(b) Cobalt
(c) Calcium
(d) Chromium

Correct Answer: (b) Cobalt

Solution:The atomic number of the given elements is:

Element	Atomic Number
Manganese	25
Cobalt	27
Calcium	20
Chromium	24
Iron	26

Therefore, the atomic number of Cobalt is higher than that of iron.

30. Which of the following elements has a higher atomic number than that of Copper? [S.S.C. Online CHSL (T-1) 27.01.2017]

(a) Iron
(b) Zinc
(c) Chromium
(d) Manganese

Correct Answer: (b) Zinc

Solution:The following are the atomic numbers of the given elements:

Element	Atomic Number
Iron	26
Chromium	24
Zinc	30
Manganese	12
Copper	29

Thus, the atomic number of zinc (30) is higher than that of copper (29).

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