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Chemistry Questions

Practice 161 Chemistry questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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161
Total Questions
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17
Easy
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141
Medium
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3
Hard
Practice by Exam:General Science(53)Mathematics and Science(27)Science(23)General Awareness(21)Chemistry(11)General Studies(10)General Knowledge(9)General Knowledge and General Awareness(3)

About Chemistry — practice questions, PYQs & concepts

Chemistry is a frequently-tested topic on General Science, Mathematics and Science, Science. ExamTest.live currently lists 161 Chemistry questions spanning previous-year papers from 2017 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Chemistry weight in competitive exams

Across our Chemistry question bank, the largest sources are General Science (53), Mathematics and Science (27), Science (23), General Awareness (21) and Chemistry (11). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 17 easy Chemistry questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Chemistry Questions(1–100 of 161)

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Q1mediummcqGeneral KnowledgeStaff Selection Commission2026
0% accuracy
What chemical is injected into a person's body when an ant bites?
Q2mediummcqGeneral ScienceStaff Selection Commission2026
0% accuracy
Which of the following elements has the lowest melting point?
Q3mediummcqScienceSSC CGL2026
0% accuracy
Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Q4mediummcqScienceSSC CGL2026
67% accuracy
Fe has 26 protons in its nucleus. What are the number of electrons in Fe
2+
(II) ion?
Q5mediummcqGeneral ScienceSSC CGL2026
33% accuracy
Which of the following elements has the lowest melting point?
Q6mediummcqScienceSSC CGL2026
33% accuracy
__________ is a strong drug that doctors give to people to make them calm or help them sleep.
Q7mediummcqGeneral AwarenessCompetitive Exam2026
0% accuracy
Which of the following statements best describes Le Chatelier's principle?
Q8mediummcqScienceCompetitive Exams2026
67% accuracy
Which of the following elements has the lowest melting point?
Q9mediummcqGeneral ScienceSSC CGL2026
50% accuracy
Chemical formula of Ammonia is ________.
Q10mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Pentlandite is an ore/mineral of ________.
Q11mediummcqGeneral ScienceSSC GD2026
0% accuracy
A stain of curry on a white cloth become reddish brown when soap is used because the soap is:
Q12mediummcqScienceSSC General Awareness2026
0% accuracy
Chemical Formula of Aluminium Nitride is
Q13mediummcqScienceSSC General Awareness2026
0% accuracy
How many lone electron pairs are present in ?
Q14mediummcqScienceWest Bengal Civil Services2026
0% accuracy
Coal, Petroleum and Natural Gas are examples of
Q15mediummcqGeneral ScienceSSC CGL2026
100% accuracy
Kidney stones are composed of ______
Q16mediummcqScienceSSC CGL2026
100% accuracy
What is the ratio by mass of carbon and oxygen in carbon dioxide?
Q17mediummcqGeneral ScienceSSC CGL2026
100% accuracy
Atomic number of which of the following elements is greater than that of Iron?
Q18mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Which chemical element of the halogen group is a light greenish-yellow highly toxic gas with atomic number 17?
Q19mediummcqGeneral ScienceSSC CGL2026
0% accuracy
What is washing soda?
Q20mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Q21mediummcqGeneral AwarenessSSC Selection Post 2021 Matriculation Level2026
0% accuracy
__________ is used to remove the temporary and permanent hardness of water.
Q22mediummcqGeneral ScienceSSC CGL2026
100% accuracy
Glass is also called _________.
Q23mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Sphalerite is an ore/mineral of _________.
Q24mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Pentane has _________ structural isomers.
Q25mediummcqGeneral AwarenessSSC CGL2026
0% accuracy
What is the mass number of Deuterium?
Q26mediummcqGeneral ScienceSSC CGL2026
0% accuracy
Eugenol is a major component of:
Q27mediummcqGeneral StudiesCompetitive Exam2026
0% accuracy
Which among the following gas was leaked during the Bhopal gas tragedy in 1984?
Q28mediummcqGeneral AwarenessStaff Selection Commission2026
0% accuracy
Which artificial element has been provisionally named seaborgium by American researchers in honour of Nobel Laureate Glenn T Seaborg?
Q29mediummcqGeneral Knowledge and General AwarenessSSC CPO 20242026
0% accuracy
Which of the following diagrams accurately represents the interconversion of the three states of matter?
(Given: Solid, Liquid, Gas; and processes: Vaporisation, Solidification, Fusion, Condensation, Sublimation, Deposition)

image
Q30mediummcqChemistryNEET 20192026
0% accuracy
Which of the following reactions are disproportionation reaction?(a) (b) (c) (d) Select the correct option from the following:
Q31mediummcqScienceCompetitive Exam Mock2026
0% accuracy
Which element although situated outside the Radioactive series, has radioactive isotope ?
Q32mediummcqGeneral ScienceSSC CGL2026
0% accuracy
The common name of dichlorodifluoromethane is ______.
Q33mediummcqGeneral AwarenessSSC CGL2026
0% accuracy
Ethanol reacts with sodium leading to the evolution of which gas?
Q34mediummcqSciencePractice Test2026
Which gas is commonly known as the 'laughing gas'?
Q35mediummcqGeneral Knowledge and General AwarenessSSC CPO 20242026
Identify the number of electrons found in the outermost shell of a halogen atom.
Q36mediummcqGeneral ScienceStaff Selection Commission2026
Which chemical is widely used to unclog drains and sinks?
Q37mediummcqGeneral AwarenessCompetitive Exams2026
Dry Ice is the solid form of:
Q38mediummcqGeneral ScienceCompetitive Exam Previous Year Paper2026
Which of the following elements has the smallest atomic radius?
Q39mediummcqSciencePrepp2026
How many electrons does a hydrogen molecule have in its K shell?
Q40mediummcqGeneral AwarenessCompetitive Exams2026
A special property of acids and bases is their ability to _______ each other’s properties.
Q41mediummcqGeneral KnowledgeCompetitive Exams2026
Baking soda, the common cooking ingredient, has which of the following chemical name?
Q42mediummcqSciencePrepp2026
What is the name of the non-benzenoid aromatic compound listed in the choices that contains a seven-membered ring with a ketone group, as referenced in the text?

image
Q43mediummcqGeneral StudiesCompetitive Exam2026
Which metalloid in the carbon group is chemically similar to its group neighbours tin and silicon?
Q44mediummcqGeneral ScienceSSC CGL2026
Which of the following is a primary constituent of pearl?
Q45mediummcqGeneral ScienceUP Police Constable2026
The monomer caprolactam is polymerised to obtain which polymer?
Q46mediummcqGeneral ScienceSSC CGL2026
The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?
Q47mediummcqGeneral KnowledgeCompetitive Exams2026
Sphalerite is an ore of:
Q48mediummcqGeneral AwarenessSSC CGL2026
How many hydrogen atoms does a molecule of acetic acid contain?
Q49mediummcqGeneral ScienceGovernment Exams2026
Propane and butane are the main components of which of the following gases?
Q50mediummcqGeneral KnowledgeCompetitive Exams2026
How many hydrogen atoms are there in a molecule of acetylene?
Q51mediummcqScienceIndian Competitive Exam2026
Who discovered Oxygen?
Q52mediummcqScienceCompetitive Exam2026
Which compound is used to remove skins from tomatoes, potatoes and other fruits and vegetables for canning and as an ingredient in food preservatives, which helps prevent the growth of mold and bacteria in food?
Q53mediummcqGeneral AwarenessStaff Selection Commission2026
Who contributed in the development of the periodic table?
Q54mediummcqScienceCompetitive Exam2026
How is the molecular weight of a fatty acid determined?
Q55mediummcqGeneral ScienceIndian Competitive Exams2026
NaHCO
3
​
is the chemical formula for _________.
Q56mediummcqChemistrySSC CGL2026
Which of the following elements has the lowest melting point?
Q57mediummcqGeneral ScienceStaff Selection Commission2026
Ilmenite is an ore/mineral of________.
Q58mediummcqGeneral ScienceStaff Selection Commission2026
The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?
Q59mediummcqScienceCompetitive Exam2026
What is the chemical formula of Nitrogen?
Q60mediummcqScienceCompetitive Exam2026
Who discovered Oxygen?
Q61mediummcqGeneral ScienceStaff Selection Commission2026
Which drug is used as a Nonsteroidal anti-inflammatory drug?
Q62easymcqSocial StudiesUPTET Paper 2 (Social Science)2026
Lemon fruit is a rich source of
Q63mediummcqGeneral ScienceCompetitive Exam Previous Year Paper2026
Which of the following is a non-metal that remains in liquid state at room temperature?
Q64mediummcqGeneral ScienceSSC CGL2026
Which of the following is false?
Q65easymcqGeneral AwarenessSSC Selection Post 2021 Matriculation Level2026
How many hydrogen atoms does a molecule of Phosphoric Acid contain?
Q66mediummcqGeneral AwarenessIndian Competitive Exam2026
What is the atomic number of lithium?
Q67mediummcqGeneral AwarenessSSC CGL2026
What are bases that are soluble in water called?
Q68mediummcqGeneral StudiesUP Police Assistant Operator Exam2026
There are some plastics which when moulded once, cannot be softened by heating. These are called:
Q69mediummcqChemistrySSC CGL2026
Which of the following statements are CORRECT?I. Esters are sweet smelling substance.II Esters are used in making perfumes.III. Functional group of ester is R-O-R'.
Q70mediummcqGeneral ScienceUP Police Constable2026
is the chemical formula of _______.
Q71mediummcqGeneral ScienceUP Police Constable2026
The alloy Rose gold contains which other metal besides gold?
Q72mediummcqSciencePrepp2026
Which of the following polyhalogen compounds is used in the production of the freon refrigerant R-22?
Q73mediummcqGeneral ScienceCompetitive Exam2026
Which of the following chemicals is commonly used for preserving tomato sauces?
Q74mediummcqGeneral ScienceSSC CGL2026
Atomic number of which of the following elements is greater than that of Copper?
Q75mediummcqGeneral ScienceCompetitive Exam2026
What was the first element discovered by Marie and Pierre Curie?
Q76mediummcqGeneral KnowledgeCompetitive Exams2026
Who is known as the ‘Father of Indian Chemistry’?
Q77mediummcqGeneral AwarenessStaff Selection Commission2026
Which of the following pairs is correctly matched?
Q78mediummcqGeneral Science@NUM: 28SSC CGL2026
Which drug is used as an Anti-Histamine?
Q79mediummcqGeneral AwarenessSSC CGL2026
Which year was designated by UNESCO as the International Year of the Periodic Table (IYPT) to mark the 150th anniversary of the Mendeleev Periodic Table?
Q80mediummcqGeneral Science@NUM: 31SSC CGL2026
Analgesics ________.
Q81mediummcqGeneral AwarenessGovernment Exams2026
Sugarcane feedstock is readily fermented into ________.
Q82easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
The catalyst used in Hydrogenation of oil is
Q83mediummcqGeneral Knowledge and General AwarenessPrepp2026
Select the name of the hydrocarbon with a structural formula .
Q84mediummcqGeneral KnowledgePrepp2026
The signs of charges of electron, proton and neutron are __________, respectively.
Q85hardmcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Which of the following gives white precipitate, with ammoniacal silver nitrate solution ?
Q86easymcqGeneral ScienceStaff Selection Commission2026
Which law was studied in the year 1787, in which it was said that as the volume of a gas increases its absolute temperature increases, and if its absolute temperature decreases, then its volume will decrease?
Q87mediummcqGeneral ScienceStaff Selection Commission2026
Atomic number of which of the following elements is greater than that of Iodine
Q88mediummcqSciencePractice Paper2026
Which of the following substances is primarily responsible for acid rain?
Q89mediummcqChemistrySSC CGL2026
What charge is present on a neutron?
Q90mediummcqGeneral Science@NUM: 32SSC CGL2026
Atomic number of which of the following elements is greater than that of Calcium?
Q91mediummcqGeneral StudiesUP Police Assistant Operator Exam2026
Which among the following is NOT an example of synthetic fibres?
Q92mediummcqGeneral AwarenessSSC CGL2026
Identify a substance that is NOT an allotrope of carbon.
Q93easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Magnetic Quantum number determines
Q94mediummcqGeneral KnowledgePrepp2026
Which of the following is the IUPAC name of m-Dichlorobenzene?
Q95easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Number of moles in of will be
Q96mediummcqGeneral AwarenessUP Police Constable2026
Damaged CFLs and fluorescent tubes should be disposed off safely because they contain ______ vapour, which is toxic in nature.
Q97mediummcqGeneral SciencePrepp2026
which of the following figures represents Mendeleev's Periodic Table that was published in a German journal in 1872?

image
Q98mediummcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
The oxidation state of Iron in is
Q99easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Which one is weak acid?
Q100mediummcqGeneral AwarenessSSC CGL2026
Atomic number of which of the following elements is greater than that of Zinc?
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