Q1. Out of the following, which one is an example of a molecule of a compound?
- Water molecule
- Nitrogen molecule
- Oxygen molecule
- Ozone
- Q2. What is the molecular formula of Aluminium oxide?
- AlO
- AlO2
- Al2O3
- Al2O5
- Q3. The atomic masses and chemical properties of Sulphur and Phosphorus are different. This can be explained on the basis of:
- Law of constant proportions
- Law of conservation of mass
- Dalton's Atomic theory
- Laws of Chemical combination
- Q4. 5 grams of compound A reacts with 10 grams of compound B to produce a new compound C. What should be the mass of C according to law of conservation of mass?
- 5 g
- 10 g
- 15 g
- 50 g
- Q5. Which of the following statements is incorrect about anions?
- Anions contain more electrons than a normal atom.
- A negatively charged ion is called anion.
- Chlorine forms Cl- ion.
- Sodium forms negatively charged ion.
- Q6. The balancing of chemical equation is based upon
- Law of combining volumes
- Law of multiple proportion
- Law of definite proportion
- Law of conservation of mass
- Q7. How many atoms does one mole of Phosphorus contain?
- 6.022 × 1023 atoms
- 2× 6.022 × 1023 atoms
- 4 × 6.022 × 1023 atoms
- 3× 6.022 × 1023 atoms
- Q8. Which one of the following is the modern symbol of Gold?
- Go
- G
- Ag
- Au
- Q9. According to the law of conservation of mass, 3 g of carbon burnt in 8 g of oxygen forms 11 g of carbon dioxide. Now, what will be the mass of carbon dioxide produced when 3 g of carbon is burnt in 50 g of oxgyen?
- 47 g
- 53 g
- 50 g
- 45 g
- Q10. Who stated the Law of conservation of mass?
- Dalton
- Lavoisier
- Cavendish
- Thomson
- Q11. What is the chemical formula of the precipitate formed in the experiment for verification of law of conservation of mass?
- Na2SO4
- BaSO4
- BaCO3
- BaCl2
- Q12. According to the Law of conservation of mass, mass of reactants will be equal to the mass of
- Products
- Catalysts
- Reagents used in the reaction
- Mass of the products and the apparatus used for the reaction
- Q13. What is the colour of the precipitate that gets formed in the experiment carried out for the verification of the law of conservation of mass?
- Green
- White
- Blue
- Yellow
- Q14. Which of the following statements is true about ‘Law of conservation of mass"?
- Substances involved in a chemical reaction can change their states but
- the total mass of the product will be equal to that of the reactant.
- The elements are always present in a constant proportion in a chemica
- l substance.
- If two elements form more than one compound between them, then the
- ratios of the masses of the second element which combine with a fixed mass
- of the first element will be ratios of small whole numbers.
- The rate of reaction is directly proportional to the active mass of the
- reactants.
- Q15. The chemical formula of sodium nitrate is
- Ca(OH)2
- Na2CO3
- NaNO3
- NaOH
- Q16. If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?
- The products must have different physical states than the reactants.
- The total mass of the reactants must equal the total mass of the products.
- The reactants must contain more complex molecules than the products do.
- The density of the reactants must equal the density of the products.
- Q17. Which of the following statements is true about the law of conservation of mass?
- In a chemical reaction, the final mass of the products is always greater than
- the initial mass of the reactants.
- In a chemical reaction, efforts should be made to preserve rare elements
- without changing them.
- Matter can be created and destroyed but cannot change forms.
- In a chemical reaction, matter is neither created nor destroyed, but is conserved.
- Q18. If 12 grams of carbon has n atoms, then the number of atoms in 12 grams of magnesium will be
- 2n
- n
- 3n
- n/2
- Q19. The number of hydrogen atoms present in one mole of hydrogen molecule is:
- 6.022 x 1023
- 12.044 x 1023
- 3.011 x 1023
- 6.022 x 1022
- Q20. Which type of reaction is being used in the experiment for verifying the law of conservation of mass?
- Displacement reaction
- Precipitation reaction
- Decomposition reaction
- Double decomposition reaction
- Q21. Calculate the number of magnesium ions present in 0.51 g of magnesium chloride.
- 3.01 × 1021 Mg2+ ions
- 6.02 × 1021 Mg2+ ions
- 6.02 × 1023 Mg2+ ions
- 3.01 × 1023 Mg2+ ions
- Q22. One mole of oxygen atom weighs 16 grams, what will be the mass (in grams) of 0.4 moles of oxygen atoms?
- 16 grams
- 32 grams
- 40 grams
- 6.4 grams
- Q23. Who gave the Law of constant proportion?
- Dalton
- Lavoisier
- Cavendish
- Proust
- Q24. The mass of 0.5 moles of water molecule is (Atomic mass, H =1; O = 16)
- 9 g
- 18 g
- 27 g
- 0.5 g
- Q25. Ram collected water samples from different sources like sea, pond, river and tube well. It is found that all the samples of water contain hydrogen and oxygen in the mass ratio of 1:8. This is in agreement with the Law of _________.
- Reciprocal Proportion
- Conservation of Mass
- Multiple Proportion
- Definite Proportion
- Q26. Which of the following molecules exist as tetratomic molecule?
- Sulphur
- Helium
- Oxygen
- Phosphorus
- Q27. Valency of hydrogen is 1 and that of sulphur is 2. What should be the formula of hydrogen sulphide?
- HS
- HS2
- H2S
- H2S2
- Q28. The mass of 6.022 × 1023 number of N2 molecules is
- 12
- 28
- 14
- 24
- Q29. Which of the following symbol does not represent a molecule?
- O2
- H
- He
- P4
- Q30. NaCl molecule is made of which of the following ions?
- Na cation and Cl anion
- Cl cation and Na anion
- Both Na and Cl cation
- Both Na and Cl anion
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