Class XI

In order to lower melting point of ice,
  1. Hot water shall be poured
  2. Solar energy shall be waited for
  3. Salt can be spread over ice
  4. Iice shall be scrapped from roads and doorways
Common salt is
  1. Acidic
  2. Alkaline
  3. Neutral
  4. Basic
Endothermic changes are indicated through
  1. Breaking of chemical bonds
  2. Making of chemical bond
  3. Burning of carbon
  4. All of these
 In Universal indicators, weak acids are represented through a color of
  1. Reddish orange
  2. Orange
  3. Yellow
  4. All of these
In Universal indicators, red color shows a pH of
  1. 0 to 3
  2. 1 to 3
  3. 1 to 7
  4. 0 to 7
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