Chemistry set 1 MCQs

Practice interactive objective questions for this topic. Select an option to instantly verify your answer and read detailed explanations.

Showing 504 questions
Q.1 What kind of radiation is absorbed by the ozone layer?
A Green radiation
B Infrared radiation
C Visible radiation
D Ultraviolet radiation
Discuss / Board
Q.2 Identify the structural formula for magnesium hydroxide.
A MgOH
B MgO2
C Mg2H2
D Mg(OH)2
Discuss / Board
Q.3 Which of the following chemical reactions takes place when quick lime reacts with water?
A CaO(s) +H2O(I) → Ca+H2(aq)
B C(s) + O2( g) → CO2( g)
C CaO(s) +H2O(I) → Ca(OH)2(aq)
D CH4( g) +2O2( g) → CO2( g)+ 2H2O(g)
Discuss / Board
Q.4 Which number is called Avogadro's constant, named after the 19th century scientist Amedeo Avogadro?
A 6.022 × 10^23
B 6.020 × 10^20
C 6.032 × 10^19
D 6.012 × 10^21
Discuss / Board
Q.5 'Au' is the symbol for which of the following elements?
A Gold
B Zinc
C Silver
D Copper
Discuss / Board
Q.6 Which of the following gases get released when dilute sulphuric acid (H2SO4) reacts with magnesium (Mg) ?
A SO3
B SO2
C O2
D H2
Discuss / Board
Q.7 Identify a monoatomic molecule.
A Helium
B Oxygen
C Carbon dioxide
D Hydrogen
Discuss / Board
Q.8 Which of the following is NOT a physical change?
A Heating of iron rod to red hot
B Curdling of milk
C Evaporation of diesel
D Sublimation of NH4Cl
Discuss / Board
Q.9 Transition elements are the elements that are found in Groups 3-12 of the modern periodic table, that constitute the ____ block.
A d-block
B s-block
C p-block
D f-block
Discuss / Board
Q.10 How many carbon dioxide and water molecules will be there in the product side, if the following equation is made balanced? C2H5OH+O2 → CO2+H2O
A 3 and 6, respectively
B 1 and 1, respectively
C 2 and 3, respectively
D 3 and 2, respectively
Discuss / Board
Q.11 Which polyatomic ionic compound is a white, crystalline powder used in fire extinguishers and to neutralise acids and bases?
A Sodium Bisulphite
B Sodium Thiosulphate
C Sodium Chromate
D Sodium Bicarbonate
Discuss / Board
Q.12 Name the straight chain alkane having chemical formula C9H20, which is used as a research chemical and in making biodegradable detergents.
A Nonane
B Dodecane
C Nonadecane
D Icosane
Discuss / Board
Q.13 Which of the following is a saturated hydrocarbon?
A C3H8
B C6H6
C C2H4
D C4H8
Discuss / Board
Q.14 Which of the following is NOT a greenhouse gas?
A Carbon Dioxide
B Methane
C Nitrous Oxide
D Nitrogen
Discuss / Board
Q.15 Which of the following radiations is primarily blocked by the ozone layer?
A Gamma
B Infra-red
C Microwave
D Ultraviolet
Discuss / Board
Q.16 When electricity is passed through water, what kind of chemical reaction occurs?
A Decomposition
B Displacement
C Double displacement
D Combination
Discuss / Board
Q.17 Which of the following statements are true based on the 4NH3( g)+5O2( g) → 4NO(g) +6H2O(g) ?
A N gets oxidized.
B O gets oxidized.
C N gets reduced.
D O gets reduced.
Discuss / Board
Q.18 Which of the following elements is used as a sacrificial anode to protect iron from rusting?
A sodium
B aluminium
C magnesium
D beryllium
Discuss / Board
Q.19 Which of the following statements is INCORRECT?
A Fats and oils get reduced over time and smell bad.
B Fats and oils are oxidised, they become rancid.
C Antioxidants are added to foods containing fats and oil to prevent oxidation.
D Chips manufacturers usually flush bags of chips with Nitrogen to prevent the chips from getting ranicid.
Discuss / Board
Q.20 Ernest Rutherford used about ____ thick gold foil for alpha scattering experiments.
A 500 atoms
B 1000 atoms
C 900 atoms
D 700 atoms
Discuss / Board
Q.21 According to Mendeleev's Periodic Table, which elements' properties matched up remarkably well with ekasilicon?
A Gallium
B Scandium
C Titanium
D Germanium
Discuss / Board
Q.22 Which of the following is a crystalline form of carbon used in nanotechnology?
A Graphene
B Lonsdaleite
C Carbophene
D Fullerene
Discuss / Board
Q.23 Why does the milkman add a very small amount of baking soda to fresh milk?
A To reduce the pH of the fresh milk from 6 to slightly more acidic
B To increase the pH of the fresh milk from 6 to slightly alkaline
C To maintain the pH of the fresh milk at 6 for a longer time
D To reduce the pH of the fresh milk from 6 to slightly alkaline
Discuss / Board
Q.24 Who is credited with the hypothesis that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules?
A Robert Boyle
B Amadeo Avogadro
C Fred Hoyle
D Jacques Charles
Discuss / Board
Q.25 The principle that mass is neither created nor destroyed in a chemical reaction is known as the:
A Law of Conservation of Mass
B Law of Multiple Proportions
C Law of Definite Proportions
D Law of Conservation of Energy
Discuss / Board
Q.26 In a chemical reaction, if the concentration of a reactant is doubled, the rate of reaction remains unchanged. The order of the reaction is:
A Second
B First
C Zero
D Half
Discuss / Board
Q.27 Who first stated the principle of refraction that postulates that every substance has a specific bending ratio 'refractive index'?
A Dennis Gabor
B Thomas Young
C Willebrord Snellius
D David Brewster
Discuss / Board
Q.28 The breakdown of rocks through processes that change their chemical composition is called:
A physical weathering
B chemical weathering
C mass wasting
D biochemical weathering
Discuss / Board
Q.29 When haloalkanes and aryl and vinyl halides react with magnesium metal they yield which reagent?
A Hinsberg reagent
B Grignard reagent
C Tollens' reagent
D Fehling reagent
Discuss / Board
Q.30 Who developed the theory of combustion as a process of combining with oxygen?
A Antoine Lavoisier
B Robert Boyle
C Friedrich Wöhler
D Johann Becher
Discuss / Board

Master Chemistry set 1 for All Competitive Exams 2026

Practicing Chemistry set 1 MCQs is one of the most effective ways to prepare for competitive examinations in 2026. This topic-wise question bank contains carefully selected multiple-choice questions designed to strengthen conceptual understanding, improve accuracy, and enhance problem-solving speed. Our collection includes beginner, intermediate, and advanced-level questions frequently asked in JKSSB, SSC, Banking, Railway, Police, Defence, State PSC, and various national-level examinations. Every question is structured to reflect real exam patterns and helps candidates become familiar with objective-type assessment formats. Instant answer verification enables students to identify mistakes immediately and learn the correct approach without wasting valuable preparation time. Regular practice of topic-wise MCQs improves retention, reinforces key concepts, and develops confidence required to perform well under exam pressure. Whether you are revising important concepts, preparing for an upcoming recruitment test, or strengthening weak areas, these practice questions provide a reliable platform for continuous improvement. Consistent participation in MCQ-based learning sessions can significantly increase your chances of achieving higher scores and better ranks in competitive examinations.

Frequently Asked Questions

Select individual options to trigger real-time validation matrix hooks. This evaluates your answers instantly and shows the correct methodology in the solution box.

Absolutely. Our content team regularly updates the question bank to reflect the latest JKSSB, SSC, Banking, Railways, Defence, and other competitive exam trends.

The number of questions varies by topic and is regularly expanded to provide comprehensive practice coverage for competitive examinations.

Yes, you can attempt the questions as many times as needed to improve accuracy, speed, and concept retention.

Yes, important questions are accompanied by explanations and solutions to help candidates understand the correct answers effectively.

Yes, this topic is frequently covered in various competitive examinations and forms an important part of exam preparation strategies.

Absolutely. The questions are suitable for both beginners and advanced learners preparing for competitive examinations.

Topic-wise practice helps identify weak areas, strengthen concepts, and build confidence before attempting full-length mock tests.

Yes, the question database is continuously updated with new MCQs to maintain relevance and align with changing exam patterns.

Regular practice with topic-wise MCQs helps candidates reduce mistakes, improve accuracy, and perform better in actual examinations.

Yes, topic-specific MCQs provide a quick and effective revision method for reinforcing important concepts before exams.

The question bank includes a mix of easy, moderate, and challenging questions designed to reflect real competitive exam standards.

Solution View

Correct Answer
Detailed Explanation: