Chemistry

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Q. Which of the following s-block elements is used in fireworks for producing a bright red color?
  • A. Lithium
  • B. Sodium
  • C. Potassium
  • D. Calcium
Q. Which of the following species is oxidized in the reaction 2H2 + O2 → 2H2O?
  • A. H2
  • B. O2
  • C. H2O
  • D. None
Q. Which of the following statements about equilibrium is true?
  • A. Equilibrium can only be achieved in closed systems
  • B. Equilibrium means that the concentrations of reactants and products are equal
  • C. At equilibrium, the forward reaction stops
  • D. Equilibrium is a static state
Q. Which of the following statements about hydrogen is true?
  • A. It is the most abundant element in the universe
  • B. It is a metal at room temperature
  • C. It has a higher electronegativity than oxygen
  • D. It can form cationic complexes only
Q. Which of the following statements about stereoisomers is true?
  • A. They have the same molecular formula
  • B. They have different connectivity
  • C. They cannot be interconverted
  • D. They have different physical properties
Q. Which of the following states of matter can be compressed the most?
  • A. Solid
  • B. Liquid
  • C. Gas
  • D. Plasma
Q. Which of the following states of matter has a definite shape and volume?
  • A. Solid
  • B. Liquid
  • C. Gas
  • D. Plasma
Q. Which of the following sublevels can hold a maximum of 6 electrons?
  • A. s
  • B. p
  • C. d
  • D. f
Q. Which s-block element has the highest melting point?
  • A. Lithium
  • B. Sodium
  • C. Potassium
  • D. Rubidium
Q. Which state of matter is characterized by the highest kinetic energy of its particles?
  • A. Solid
  • B. Liquid
  • C. Gas
  • D. Bose-Einstein Condensate
Q. Which type of bond is formed between sodium and chlorine in NaCl?
  • A. Covalent
  • B. Ionic
  • C. Metallic
  • D. Hydrogen
Q. Which type of bond is formed between sodium and chlorine in sodium chloride?
  • A. Covalent bond
  • B. Ionic bond
  • C. Metallic bond
  • D. Hydrogen bond
Q. Which type of bond is primarily responsible for the high boiling point of water?
  • A. Ionic bond
  • B. Covalent bond
  • C. Hydrogen bond
  • D. Metallic bond
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