This page covers the top 20 Agniveer Army Technical Basic Chemistry questions with full solutions, difficulty grading, and exam-specific shortcuts. All 4 subtopics are covered with graded practice MCQs.
In a covalent bond, electrons are shared between atoms. Which of the following best describes the nature of a coordinate covalent bond (dative bond)?
Q2Easy
The electronegativity values of C, N, and O are approximately 2.5, 3.0, and 3.5 respectively. Which bond is most polar?
Q3Easy
Which of the following correctly represents the electron configuration of Iron (Fe, atomic number 26)?
Q4Easy
According to Bohr's model, the energy of an electron in the nth orbital of a hydrogen atom is proportional to:
Q5Easy
The bond angle in a water molecule (H₂O) is approximately 104.5° instead of 120°. This deviation from the expected tetrahedral angle is primarily due to:
Q6Easy
Which of the following molecules exhibits sp hybridization in its central atom?
Q7Easy
If 2.0 moles of oxygen gas (O₂) react completely with hydrogen to form water, how many moles of water are produced? (2H₂ + O₂ → 2H₂O)
Q8Easy
An atom has 15 protons and 16 neutrons. What is its mass number?
Q9Easy
What is the primary characteristic that distinguishes a liquid from a gas?
Q10Easy
The number of protons, neutrons, and electrons in ₃₇Cl⁻¹ are respectively:
Q11Easy
What is the freezing point of water at standard atmospheric pressure?
Q12Easy
According to the modern atomic theory, atoms of the same element must have the same number of:
Q13Easy
What is the empirical formula of a compound containing 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass?
Q14Easy
At what temperature does water transition from liquid to gaseous state at standard atmospheric pressure?
Q15Easy
Which state of matter has particles with the highest average kinetic energy?
Q16Easy
How many significant figures are present in the measurement 0.00450 kg?
Q17Easy
Which of the following statements about the solid state is correct?
Q18Easy
The maximum number of electrons that can be accommodated in the M shell (n = 3) is:
Q19Easy
What is the SI unit of amount of substance?
Q20Easy
In the ammonia molecule (NH₃), the molecular geometry is trigonal pyramidal while the electron geometry is tetrahedral. What accounts for this difference?
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