Civil Services Prepby Garima Malik & Nitin Sangwan

Agriculture and Food Systems CSAT: Comprehension, Reasoning and Numeracy Current Affairs Study Disaster Risk and Management Economy and Development Qualifying English Environment, Ecology and Climate Essay and GS Answer Writing Ethics, Integrity and Aptitude Indian and World Geography Governance and social justice Ancient and Medieval History, Art and Culture Modern Indian History Qualifying Indian Language Internal Security International Relations Polity and Constitution General Science and Technology Indian Society Modern World History

PYQs Evaluate your answer

Current affairs Common questions

Account

Home
Syllabus
General Science and Technology
Matter, mixtures and chemical quantities
Atoms and chemical quantities

UPSC · Prelims and Mains

General Science and Technology

← All subjects

Find a topic

General Science and Technology

Matter, mixtures and chemical quantities
Atomic structure, bonding and reactions
Acids, metals and carbon compounds
Motion, forces and mechanical energy
Heat, sound and light
Electricity and magnetism
Cells and biological organisation
Nutrition, body systems and coordination
Reproduction, heredity and evolution
Infection, immunity and diagnostic principles
Classification of living organisms
Energy technologies and the nuclear fuel cycle
Biotechnology and genomic applications
Nanoscale materials and applications
Computers and communication networks
Space systems and Indian missions
Intellectual property and innovation
AI, robotics and emerging computing
Additive manufacturing
Indian scientific contributions and research capacity

← Matter, mixtures and chemical quantities

Atoms and chemical quantities

Find a topic

Conservation of mass in reactions
Constant proportions in compounds
Atomic mass
Molecular mass
The mole
Avogadro constant
Chemical formulae

Civil Services Prep

nitin@preps.in

Study

Home Prelims practice Syllabus Mains evaluation Plans and pricing Current affairs Mentorship Mains PYQ library

Explore

Prelims PYQs Prelims MCQs Mains PYQs Current affairs archive Blog

Exam information

UPSC syllabus Exam calendar Eligibility Prelims cut off Prelims 2026 answer key

Legal

Privacy policy Terms of service