Class XI

 It cannot be split into simpler substances through chemical processes. It is
  1. A matter
  2. An element
  3. A metal
  4. An atom
Overall energy change can be calculated by
  1. Subtracting energy taken in when bonds are broken from energy given out when bonds are made
  2. Adding energy taken in when bonds are broken and energy given out when bonds are made
  3. Subtracting energy given out when bonds are made from energy taken in when bonds are broken
  4. Multiplying all enthalpy changes
Other than Carbon (C), Nitrogen (N2), Oxygen (O2), and Hydrogen (H2), another element of a tree is
  1. Calcium
  2. Chromium
  3. Nickel
  4. Phosphorus
In Calcium Hydroxide (Ca(OH)2), valency of Ca is
  1. -1
  2. -2
  3. 1
  4. 2
 In order to form products from reactants, it is important to
  1. Develop energy profile diagrams
  2. Pass transition barrier
  3. Pass energy barriers
  4. Pass activation energy tests
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