Board exam

The products formed when Aluminium and Magnesium are burnt in the presence of air respectively are :

1. AAl₃O₄ and MgO₂
2. BAl₂O₃ and MgO
3. CAl₃O₄ and MgO
4. DAl₂O₃ and MgO₂

Consider the following reactions :

1. (i)
   Dilute hydrochloric acid reacts with sodium hydroxide.
2. (ii)
   Magnesium oxide reacts with dilute hydrochloric acid.
3. (iii)
   Carbon dioxide reacts with sodium hydroxide. It is found that in each case :

Reaction between two elements A and B, forms a compound C. A loses electrons and B gains electrons. Which one of the following properties will not be shown by compound C ?

1. AIt has high melting point.
2. BIt is highly soluble in water.
3. CIt has weak electrostatic forces of attraction between its oppositely charged ions.
4. DIt conducts electricity in its molten state or aqueous solution.

The metals obtained from their molten chlorides by the process of electrolytic reduction are :

1. AGold and silver
2. BCalcium and magnesium
3. CAluminium and silver
4. DSodium and iron

Secretion of less saliva in mouth will effect the conversion of :

1. Aproteins into amino acids
2. Bfats into fatty acids and glycerol
3. Cstarch into simple sugars
4. Dsugars into alcohol

The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :

1. ACytokinins
2. BGibberellins
3. CAdrenaline
4. DAuxins

The correct/true statement(s) for a bisexual flower is/are :

1. (i)
   They possess both stamen and pistil.
2. (ii)
   They possess either stamen or pistil.
3. (iii)
   They exhibit either self-pollination or cross-pollination.
4. (iv)
   They cannot produce fruits on their own.