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SSC CGL Exam  >  SSC CGL Tests  >  SSC CGL Previous Year Papers  >  Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - SSC CGL MCQ

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - SSC CGL MCQ


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30 Questions MCQ Test SSC CGL Previous Year Papers - Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 for SSC CGL 2024 is part of SSC CGL Previous Year Papers preparation. The Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 below.
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Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 1
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Which are the four quantum numbers for an electron present in 4f orbital?
[SSC CHSL 03/08/2023 (1st shift)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 1

n = 4, l = 3, m = + 1, s = + 1/2.
There are four quantum numbers:
Principal (n) - It refers to the electron shell with the most electrons, giving the electron's likely distance from the nucleus.
Azimuthal (l) - It is defined as the determination of the shape of an orbital.
Magnetic (m) - The subshell's overall number of orbitals and their orientation.
Spin (s) - The values of n, l, and m have no bearing on the electron.
The 4s subshell contains 1 orbital and can hold up to 2 electrons. The 4p subshell contains 3 orbitals and can hold up to 6 electrons. The 4d subshell contains 5 orbitals and can hold up to 10 electrons. The 4f subshell has 7 orbitals and can hold up to 14 electrons.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 2
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Which theory discusses the relationship between ligand bonding and degradation of d orbitals in metal complexes and the geometry of metal complexes and the splitting of d orbitals?
[SSC CGL 05/12/2022 (4th Shift)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 2
Crystal field theory: (1929, developed by physicist Hans Bethe) describes the breaking of orbital degeneracy in transition metal complexes due to the presence of ligands.
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Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 3
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What is the atomicity of Phosphorus?
[SSC CPO 10/11/2022 (Evening)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 3
Tetra-atomic. Atomicity is the total number of atoms present in a molecule. Polyatomic (composed of three or more atoms). Phosphorus was first made by Hennig Brandt in 1669.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 4
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Which formula is used to represent the three-dimensional structures of molecules using a two-dimensional surface like a sheet of paper or a computer screen?
[SSC CPO 11/11/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 4
Dash-wedge formula. Bond - line formula is used for every bond represented as a line in a zigzag manner.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 5
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In the electronic configuration of an atom, what does ‘n’ signify in the formula 2n²?
[SSC CHSL 27/05/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 5
The electronic configuration of an element describes how electrons are distributed in its atomic orbitals. The maximum number of electrons that can be accommodated in a shell is based on the principal quantum number (n) and is represented by the formula 2n², where 'n' is the shell number.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 6
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If the size of the nucleus of an atom is compared with a cricket ball, then the radius of the atom is approximately equal to how many kilometers?
[SSC CPO 23/11/2020 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 6
5 km. The radius of the atom is 10⁻¹⁰ m, and the radius of nucleus is 10⁻¹⁵ m.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 7
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The first electron shell which is the nearest to the nucleus never holds more than 'n' electrons, where 'n' is equal to:
[SSC CGL 6/03/2020 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 7
2. The maximum number of electrons accommodated in a shell based on principal quantum number (n). It is represented by the formula 2n².
K shell, n = 1, Max Electron = 2 × 1² = 2.
L shell, n = 2, Max Electron = 2 × 2² = 8.
M shell, n = 3, Max Electron = 2 × 3² = 18.
N shell, n = 4, Max Electron = 2 × 4² = 32.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 8
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Which of the following is NOT an alkaline earth metal?
[SSC Stenographer 12/10/2023 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 8
Na (Sodium) - It is an Alkali metal. Alkaline earth metals: Beryllium (Be, 4), Magnesium (Mg, 12), Calcium (Ca, 20), Strontium (Sr, 38), Barium (Ba, 56), Radium (Ra, 88). They have two electrons in their outermost shells. Alkali metals: Lithium (Li, 3), Sodium (Na, 11), Potassium (K, 19), Rubidium (Rb, 37), Caesium (Cs, 55), Francium (Fr, 87).
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 9
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Which radioactive isotope has a half-life of 5770 years, which is commonly used to estimate the age of organic materials such as paper and parchment?
[SSC CHSL 08/08/2023 (1st shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 9

14C - It is an unstable and weakly radioactive isotope of carbon. Three Natural isotopes of carbon: 12C, 13C and 14C. Isotopes - Atoms of the same element having the same atomic number but different mass numbers. For example, take the case of hydrogen atom, it has three atomic species, namely protium (¹₁H), deuterium (²₁H or D) and tritium (³₁H or T). The atomic number of each one is 1, but the mass number is 1, 2 and 3, respectively.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 10
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From which Latin word is the s-block element calcium derived?
[SSC CGL 14/07/2023 (3rd shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 10
Calx (calcium hydroxide). Formula - Ca(OH)₂. It is used in industrial settings, such as sewage treatment, paper production, construction, and food processing. Calum (calcium carbonate): Formula - CaCO₃.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 11
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Which element of Group 17 has two isotopes of masses 35 and 37 amu with average abundance of 75.77% and 24.23%, respectively?
[SSC CGL 17/07/2023 (1st shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 11
Chlorine. Element of Group 17: The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (9, F), chlorine (17, Cl), bromine (35, Br), iodine (53, I), and astatine (85, At).
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 12
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Which among the following alloys is a combination of gold and silver?
[SSC MTS 10/05/2023 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 12
Electrum. Some other alloys: Steel (Carbon and Iron). Stainless steel - (Iron with Chromium and Nickel). German silver - (copper, zinc and nickel). Rose Metal - (Bismuth, Lead and Tin). Gun Metal - (Cu + Sn + Zn + Pb). Dutch metal- (Cu and Zn). Constantan (Eureka) - Alloy of 55% Copper and 45% Nickel. Solder - It is made up of Tin and Lead.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 13
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Which of the following statements is correct?
[SSC CHSL 14/03/2023 (3rd Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 13
Example - Fe (Iron) + H₂SO₄ (sulfuric acid) → FeSO₄ (ferrous sulfate) + H₂ (hydrogen). Non-metals react with oxygen - produce nonmetallic oxides (Acidic), Example - S (Sulphur) + O₂ (Oxygen) → SO₂ (Sulfur Dioxide). Metals react with oxygen - Produce metallic oxides (Basic), Example - Mg (Magnesium) + O₂ (Oxygen) → MgO (Magnesium Oxide).
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 14
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Which of the following liquids can dissolve noble metals such as gold and platinum?
[SSC CPO 10/11/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 14
Aqua regia is a mixture of hydrochloric acid and nitric acid present in the ratio 3:1. Formic acid (methanoic acid, chemical formula - HCOOH ) is the simplest carboxylic acid ,used as a preservative and antibacterial agent.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 15
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Which of the following statements is NOT correct regarding the alkali metals?
[SSC CPO 11/11/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 15
Alkali metals have one electron in their valence shell. Group 1A of the periodic table are the alkali metals: Hydrogen (H, 1), Lithium (Li, 3), Sodium (Na, 11), Potassium (K , 19), Rubidium (Rb, 37), Cesium (Cs, 55), and Francium (Fr , 87).
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 16
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Choose the most reactive metal from the options given below.
[SSC MTS 06/07/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 16
Sodium. Reactive metals in order: Potassium (Most reactive metal), Sodium, Barium, Calcium, Magnesium, Aluminium, Zinc, Iron, Nickel, Tin, Lead, Hydrogen, Copper, Mercury, Silver, Gold, Platinum (Least Reactive).
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 17
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Which of the following metals reacts with the moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat?
[SSC CHSL 16/04/2021 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 17

Copper (Cu, Group - 11, Atomic number - 29). The green substance is basic copper carbonate (CuCO3).

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 18
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A 100 mL solution having 0.01 moles of NaOH dissolved in it. The pH of the solution is:
[SSC CHSL Tier II (10/01/2024)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 18

Concentration of OH ions = 0.01 moles / 100 mL =  0.01 moles / 0.1 L = 0.1 M.
Hence, [OH−] = 0.1 M. Now, pOH = −log
[OH-] pOH = −log (10–1). pOH = 1 log 10
= 1. We know that, pH + pOH = 14 pH = 14 − pOH = 14 – 1 = 13.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 19
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The reaction between an acid and a base is known as_______?
[SSC MTS 03/05/2023 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 19

Neutralisation reaction. When a strong acid reacts with a strong base, it results in a salt which is neutral. Example: HCl + NaOH → NaCl + H2O.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 20
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Which acid destroys the bacteria that enter the stomach?
[SSC MTS 03/05/2023 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 20
Hydrochloric acid (HCl) - It is present in the gastric juice, and breaks down the food and the digestive enzymes.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 21
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Which of the following is used as an antacid to neutralise stomach acidity?
[SSC MTS 18/05/2023 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 21
Magnesium Hydroxide. It is an inorganic compound. It is naturally found as the mineral brucite. It can be used as an antacid.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 22
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Which of the following statements is correct?
[SSC CHSL 13/03/2023 (1st Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 22
The pH (Potential of Hydrogen) range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicates acidity, whereas a pH of greater than 7 indicates a base. Tooth decay begins when the pH of the mouth falls below 5.5.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 23
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pH of milk of magnesia is _________.
[SSC CGL 06/12/2022 (2nd Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 23
Milk of magnesia - Magnesium hydroxide Mg(OH)₂ is used to treat symptoms caused by too much stomach acid such as heartburn, upset stomach, or indigestion. Blood is slightly basic, with a normal pH range of about 7.35 to 7.45.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 24
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Which of the following is a natural acid-base indicator?
[SSC CGL 06/12/2022 (3rd Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 24
Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. Examples: Litmus, China Rose Petal, Red Cabbage, Turmeric etc.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 25
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Which of the following acids is found in spinach?
[SSC MTS 07/07/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 25
Oxalic acid (C₂H₂O₄) is an organic compound in many plants, including leafy greens (like spinach), vegetables, fruits, cocoa, nuts, and seeds.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 26
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What happens when an acid or a base is mixed with water?
[SSC CHSL 24/05/2022 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 26

Acids in water dissociate H+ ions. When an acidic solution is diluted with water, the concentration of H+ ions decreases, and the pH of the solution increases towards 7. When an alkali is diluted with water, the concentration of OH- ions decreases, and the pH of the alkali falls towards 7.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 27
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What does ‘p’ in pH stand for?
[SSC CHSL 01/06/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 27

"pH" is a measure of how acidic/basic water is. It was first described by Danish biochemist Soren Peter Lauritz Sorensen in 1909. The "p" stands for the power or concentration, and the "H" for the hydrogen ion (H+).

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 28
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Identify the acid that helps in digestion.
[SSC CHSL 02/06/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 28
Hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. Gastric juice is a unique combination of hydrochloric acid (HCl), lipase, and pepsin produced by parietal cells in the stomach.
Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 29
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What do you call a base that dissolves in water?
[SSC CHSL 08/06/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 29

Alkali is a basic, ionic salt of an alkali metal or an alkaline earth metal that can dissolve in water. Examplespotassium hydroxide, sodium hydroxide, etc. The pH value of a soluble base is greater than 7.0. Alkenes possess at least one carbon-carbon double bond (C = C) and have a general formula of CnH2n. Aldehyde (R − CH = O); Alcohol (R − OH). 

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 30
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The salinity of ocean waters is calculated as the amount of salt (in gm) dissolved in ______ gm of seawater.
[SSC CGL 13/04/2022 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 1 - Question 30
Salinity is the amount of dissolved salts or ions in seawater. The average salinity of the oceans is 35 parts per thousand.
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