Electricity — Science STD 10 — Question

Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?

Name an alloy of copper. State its chemical composition and any one use.

Write balanced chemical equation with state symbols for the following reaction:
Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.

Name the gland which controls the secretion of hormones from the pituitary.

Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.

Write definitions: Aerobic respiration.

Name the organs which produce sperms in human males.

When a solution is added to a cloth strip treated with onion extract, then the smell of onion cannot be detected. State whether the given solution containsan acid or a base.

State number of electrons in the outermost orbit of carbon and valency of carbon.

Explain why, some materials are biodegradable but some are non-biodegradable.