What is the full meaning of IUPAC?

international union of pure and applied chemistry

International union of petroleum and aero chemicals

Internal united political advancement countries

Which of the following is true?

Halogens have high electron affinity

Metals have high electron affinity

Which of the following is true?

Electron affinity decreases down the group

Electron affinity decreases across the period

Electron affinity varies according to element group

Science Quiz On 11th Grade Chemistry

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1/10 Questions

What is the IUPAC name of NaCl
- Sodium nitrite
- Nitrate chlorine
- Sodium chlorine
- Sodium chloride

About This Quiz

Chemistry is an interesting subject whose history dated far back. It is the study of matter. In another words study of anything that has mass and occupy space. So it is basically study of almost all things. Most basic concepts a Chemistry student need to master includes;chemical nomenclature,atomic structure,periodic table,lewis structure, chemical reaction, stoicchometry ,acid base chemistry.

Science Quiz On 11th Grade Chemistry - Quiz

2.

What is a covalent bond?
- When an atom splits electrons
- When atoms rejects eletron
- When atoms shares electrons
- Non of the above
Correct Answer

A. When atoms shares electrons

Explanation

A covalent bond is a type of chemical bond formed when atoms share electrons. In this type of bond, the atoms involved mutually share their outer electrons to achieve a more stable electron configuration. This sharing of electrons allows the atoms to fill their outermost energy levels and attain a more stable state, resulting in the formation of a strong bond between the atoms.

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3.

What is ionic Bonds?
- When one atom takes an electron from another
- When one atom takes a proton from another
- When one atom takes neuron from another
- Non of the above
Correct Answer

A. When one atom takes an electron from another

Explanation

Ionic bonds occur when one atom transfers an electron to another atom. This transfer creates two ions, one with a positive charge (cation) and one with a negative charge (anion). The opposite charges attract each other, resulting in a strong bond between the two ions. This type of bond typically occurs between a metal and a non-metal.

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4.

What is the IUPAC name of NO3-?
- Nitrate
- Nitrite
- Nitrogen oxygen
- Nitrogen three minus
Correct Answer

A. Nitrate

Explanation

The correct answer is Nitrate. Nitrate is the IUPAC name for the NO3- ion. It consists of one nitrogen atom bonded to three oxygen atoms, and it carries a negative charge. Nitrite, nitrogen oxygen, and nitrogen three minus are not the correct IUPAC names for NO3-.

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5.

What is the full meaning of IUPAC?
- International union of pure and applied chemistry
- International union of petroleum and aero chemicals
- Internal united political advancement countries
- Non of the above
Correct Answer

A. International union of pure and applied chemistry

Explanation

The correct answer is "international union of pure and applied chemistry." IUPAC is an international scientific organization that develops and promotes standards for the field of chemistry. It is responsible for naming and classifying chemical compounds, as well as establishing guidelines for chemical nomenclature and terminology.

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6.

Which of the following is an example of a covalent bond?
- Nacl
- Kcl
- H2O
- Alcl3
Correct Answer

A. H2O

Explanation

H2O is an example of a covalent bond because it consists of two hydrogen atoms sharing electrons with one oxygen atom. In a covalent bond, atoms share electrons to achieve a stable electron configuration. NaCl and KCl are examples of ionic bonds, where electrons are transferred from one atom to another. AlCl3 is an example of a coordinate covalent bond, where one atom donates a pair of electrons to another atom.

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7.

Which of the following is example of ionic Bond?
- H3O
- H2O
- NH3
- Nacl
Correct Answer

A. Nacl

Explanation

NaCl is an example of an ionic bond because it is formed between a metal (Na) and a non-metal (Cl). In an ionic bond, electrons are transferred from the metal to the non-metal, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions). In the case of NaCl, sodium (Na) loses an electron to become a positively charged ion (Na+), while chlorine (Cl) gains that electron to become a negatively charged ion (Cl-). These oppositely charged ions attract each other, forming a strong ionic bond between them.

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8.

Which of the following is true?
- Metals have high electron affinity
- Halogens have high electron affinity
- Non of the above
- All of the above
Correct Answer

A. Halogens have high electron affinity

Explanation

Halogens have high electron affinity because they have a high tendency to gain an electron and form a stable negative ion. This is due to their high electronegativity and the presence of an empty p orbital in their outermost energy level. Metals, on the other hand, have low electron affinity as they have a tendency to lose electrons and form positive ions. Therefore, the correct statement is that halogens have high electron affinity.

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9.

What is the IUPAC name of NO2-?
- Nitrate
- Nitrogen two minus
- Nitrite
- Nitrogen oxygen
Correct Answer

A. Nitrite

Explanation

The IUPAC name of NO2- is Nitrite. In IUPAC nomenclature, the suffix "-ite" is used to denote an anion containing one less oxygen atom than the "-ate" form. In this case, the "-ate" form would be Nitrate (NO3-), so the anion with one less oxygen atom is named Nitrite (NO2-).

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10.

Which of the following is true?
- Electron affinity decreases down the group
- Electron affinity decreases across the period
- Electron affinity varies according to element group
- Non of the above
Correct Answer

A. Electron affinity decreases down the group

Explanation

Electron affinity generally decreases as you move down a group in the periodic table because the added electron is further from the nucleus in larger atoms, and thus experiences less attraction. Electron affinity generally increases across a period from left to right due to increasing nuclear charge, but the trend can vary slightly depending on the element.

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2