Class XI

Among the alkali metals,Cesium is the most reactive because:
  1. its incomplete shell is nearest to the nucleus
  2. it is the heaviest alkali metal
  3. the outermost electron is very loosely bound than the outermost electron of the other alkali metals
  4. it has a single electron in the valence shell
In the modern periodic table
  1. The horizontal rows are called periods and the vertical columns, groups.
  2. The horizontal rows are called groups and the vertical columns, periods
  3. The horizontal rows are called periods and the vertical columns, series.
  4. The horizontal rows are called series and the vertical columns, groups.
The correct order for the decrease in atomic radii is
  1. Li< Be< B< C
  2. Li< Be< B< C
  3. Be< B< C< Li
  4. C< Li< Be< B
Which one of the following organelle in the figure correctly matches with its function ?
  1. Rough endopolasmic reticulum, formation of glycoproteins
  2. Golgi apparatus, protein synthesis
  3. Golgi apparatus, formation of glycolipids
  4. Rough endoplasmic reticulum, protein synthesis
The third period (n = 3) begins at sodium with addition of first electron to
  1. 2p orbital
  2. 2s orbital
  3. 3s orbital
  4. 3p orbital
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