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.151 Which of the following elemental gases was discovered by Joseph Priestley in 1774 when he heated mercury oxide?
A Silver
B Hydrogen
C Oxygen
D Rhodium
Discuss / Board
Q.152 Consider the statements about electrons: A. They have negative charge. B. They were discovered by J.J. Thomson. C. They orbit the nucleus.
A Both A and C is true
B A, B, C are true
C Only B and C is true
D Both A and B is true
Discuss / Board
Q.153 Newlands law of octaves was only applicable upto which element?
A Phosphorous
B Silicon
C Iodine
D Calcium
Discuss / Board
Q.154 Direct change of gas to solid without changing in to liquid is called .
A Sublimation
B Vaporization
C Evaporation
D Deposition
Discuss / Board
Q.155 Which of the following is a 's' block element?
A Sodium
B Carbon
C Iron
D Neon
Discuss / Board
Q.156 Which of the following bacteria grow in milk and convert it to curd?
A Salmonella typhi
B Salmonella lactae
C E. curdae
D Lactic acid bacteria
Discuss / Board
Q.157 Which metallic element is called 'ferromagnetic' because of its strong attraction?
A Gold
B Molybdenum
C Aluminium
D Iron
Discuss / Board
Q.158 Which is a colourless, odourless gas of the alkane series of hydrocarbons with a chemical formula of C3H8 ?
A Propane
B Butane
C Methane
D Ethane
Discuss / Board
Q.159 In ethylene (C2H4), hybridisation of carbon atoms is:
A sp2
B sp3
C sp
D sp3d
Discuss / Board
Q.160 Which law was studied in the year 1787, in which it was said that as the volume of a gas increases its absolute temperature, if its absolute temperature decreases, then its volume will decrease?
A Charles's law
B Dalton's law
C Boyle's law
D Avogadro's law
Discuss / Board
Q.161 Which metalloid in the carbon group is chemically similar to its group neighbours tin and silicon?
A lead
B nickel
C manganese
D Germanium
Discuss / Board
Q.162 What is the name of the process of gases being outpoured from the interior of the solid earth?
A Subduction
B Erosion
C Outgassing
D Weathering
Discuss / Board
Q.163 Which artificial element has been provisionally named seaborgium by American researchers in honour of Nobel Laureate Glenn T Seaborg?
A Element 103
B Element 106
C Element 90
D Element 97
Discuss / Board
Q.164 Which of the following statements best describes Le Chatelier's Principle?
A It states that energy cannot be created or destroyed.
B It relates the pressure and volume of a gas.
C If a dynamic equilibrium is disturbed by changing conditions, the position of equilibrium moves to counteract the change.
D It defines the rate of chemical kinetics.
Discuss / Board
Q.165 Who was recognised for his services in the discovery of inert gaseous elements in air and in the determination of their place in the periodic system?
A Lord Rayleigh
B Henry Cavendish
C Henry Miers
D Sir William Ramsay
Discuss / Board
Q.166 Which is the weakest intermolecular force, considered as the Van der Waals force, often found in halogens, noble gases and other non-polar molecules?
A Hydrogen bonding
B Dipole-dipole
C Ion-dipole
D London dispersion forces
Discuss / Board
Q.167 Technetium, the first artificially produced element used in many medical diagnostic imaging scans, is found in which group of the periodic table?
A Group 7
B Group 19
C Group 12
D Group 14
Discuss / Board
Q.168 Identify the odd option from among the following.
A Nitrogen
B Oxygen
C Fluorine
D Sodium
Discuss / Board
Q.169 The correct chemical formula of the compound Magnesium Hydroxide is:
A MgOH
B Mg(OH)3
C Mg2OH
D Mg(OH)2
Discuss / Board
Q.170 What is the name of the solution that is employed to identify the existence of starch in food?
A Ammonium chloride
B Chlorine solution
C Iodine solution
D Copper sulphate solution
Discuss / Board
Q.171 The unit of density is:
A metre cubed
B metre squared
C kilogram metre per second
D kilogram per cubic metre
Discuss / Board
Q.172 Who arranged the 56 elements in an ascending order of their atomic mass and found that each 8th element had the same properties?
A Van Spronsen
B John Newlands
C Dmitri Mendeleev
D Lothar Meyer
Discuss / Board
Q.173 Identify an element that does NOT belong to period 4.
A Zinc
B Potassium
C Calcium
D Lithium
Discuss / Board
Q.174 Who introduced the term 'triads' in the classification of elements?
A Dmitri Mendeleev
B Johann Dobereiner
C AEB de Chancourtois
D John Newlands
Discuss / Board
Q.175 Which of the following processes occurs during decomposition in soil?
A Defragmentation
B Humification
C Oxidation
D Crystallisation
Discuss / Board
Q.176 Who used the drawing circle and arrow symbols to represent the atoms of different elements in 1803?
A Amedeo Avogadro
B Antoine Lavoisier
C Jacob Berzelius
D John Dalton
Discuss / Board
Q.177 Which element is the first element in group 13 of the periodic table?
A Boron
B Gallium
C Indium
D Aluminium
Discuss / Board
Q.178 Identify the atomic number of an element that belongs to group 17.
A 10
B 11
C 17
D 18
Discuss / Board
Q.179 Identify the correct statement related to metallic character.
A Metallic character decreases across a group and stays the same down a group.
B Metallic character decreases across a period and increases down a group.
C Metallic character increases across a period and decreases down a group.
D Metallic character stays the same across a period and decreases the same down a group.
Discuss / Board
Q.180 Who among the following coined the name oxygen for the element released by mercury oxide in 1779?
A Martin Klaproth
B John Dalton
C Jons Jacob Berzelius
D Antoine Lavoisier
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.

For additional MCQs, detailed explanations, and exam discussions, visit Ask JK Exam Library , our dedicated question-and-answer platform for competitive exam aspirants.

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: