Class 9 β Chemistry
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Textbooks β’ PCTB β’ π 0 β’ β¬ 0
Chapter-wise Notes β’ Chapter 1 β’ PCTB β’ 5.3 KB β’ π 1 β’ β¬ 1
Guess Papers β’ 2026 β’ PCTB β’ 2.9 KB β’ π 1 β’ β¬ 1
Practice MCQs β Chemistry
Q1. The branch of chemistry that deals with hydrocarbons is called:
β Correct: B β Organic chemistry is the study of carbon compounds, especially hydrocarbons.
Q2. The chemical symbol of sodium is:
β Correct: C β Na comes from the Latin name Natrium.
Q3. The atomic number of carbon is:
β Correct: B β Carbon has 6 protons, so its atomic number is 6. Its mass number is 12.
Q4. Which one is a molecule of an element?
β Correct: C β O2 is made of atoms of the same element (oxygen).
Q5. The empirical formula of glucose (C6H12O6) is:
β Correct: A β Divide subscripts by 6: C6H12O6 β CH2O.
Q6. Avogadro's number is:
β Correct: B β One mole of any substance contains 6.022 x 10^23 particles.
Q7. The molecular mass of water (H2O) is:
β Correct: C β 2(1) + 16 = 18 amu.
Q8. Which of the following is an ion?
β Correct: B β Na+ has lost an electron, so it is a positively charged ion (cation).
Q9. The smallest particle of an element that can take part in a chemical reaction is:
β Correct: B β An atom is the smallest unit of an element that retains its properties in reactions.
Q10. One mole of any gas at STP occupies:
β Correct: B β Molar volume of an ideal gas at STP is 22.4 dm3.
Q11. The canal rays are also called:
β Correct: B β Canal rays are streams of positively charged particles.
Q12. The gold foil experiment was performed by:
β Correct: C β Rutherford used alpha particles on gold foil in 1911.
Q13. Most of the mass of an atom is concentrated in the:
β Correct: B β Protons and neutrons in the nucleus carry almost all the mass.
Q14. The charge on a neutron is:
β Correct: C β Neutrons are electrically neutral particles.
Q15. Isotopes have the same:
β Correct: C β Isotopes are atoms of the same element (same atomic number) with different mass numbers.
Q16. The maximum electrons in the M shell are:
β Correct: C β Capacity of shell n is 2n2; for M (n=3) it is 18.
Q17. The electronic configuration of sodium (11) is:
β Correct: A β K=2, L=8, M=1 gives a total of 11 electrons.
Q18. The isotope used in cancer treatment is:
β Correct: B β Cobalt-60 emits gamma rays used in radiotherapy. Uranium-235 is used in nuclear reactors.
Q19. The mass number of an atom is the sum of:
β Correct: C β Mass number A = protons + neutrons.
Q20. Which particle was discovered by J.J. Thomson?
β Correct: C β Thomson discovered the electron through cathode ray experiments in 1897.