P-2 Life Processes in Living Organisms Part – 1 — Science STD 10 — Question

What is aqua-regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.

Write down the electronic configuration of (i) sodium atom, and (ii) chlorine atom.

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka - boron, eka - aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

What sizes of plants are produced if both parents have genes Tt?

Name the metal which is the poorest conductor of heat.

Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:

1. For decorating a hotel building from outside?
2. For lighting inside the rooms of the hotel?

Why is sodium chloride required in our body?

What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?

State whether an aqueous solution of washing soda is acidic or alkaline? Give reason for your answer.

Name two metals which are used:
For making domestic utensils and factory equipment.