English Medium Class 10 - CBSE Important Questions

Name the following:

\[\ce{CH3 - CH2CH = CH2}\]

Show the covalent bond formation in nitrogen molecule.

Raina while doing certain reactions observed that heating of substance ‘X’ with a vinegar-like smell with a substance ‘Y’ (which is used as an industrial solvent.) in the presence of conc. Sulphuric acid in a water bath gives a sweet-smelling liquid ‘Z’ having molecular formula C₄H₈O₂. When heated with caustic soda (NaOH), ‘Z’ gives back the sodium salt and the compound ‘Y’.

Identify ‘X’, ‘Y’, and ‘Z’. Illustrate the changes with the help of suitable chemical equations.

A spatula full of sodium carbonate is taken in a test tube and 2 mL of dilute ethanoic acid is added to it.

Write a chemical equation for the reaction.

The number of single and double bonds present in a molecule of benzene (C₆H₆) respectively, are ______.

A spatula full of sodium carbonate is taken in a test tube and 2 mL of dilute ethanoic acid is added to it.

Suggest a method of testing the gas liberated in the reaction.

Name the oxidising agent used in the conversion of ethanol to ethanoic acid.

Write the chemical equation for the ethanol to ethanoic acid of an oxidation reaction.

How is ethanol to ethanoic acid an oxidation reaction different from the reaction in which ethanol burns in the presence of oxygen?

What is haemoglobin? State the consequences of deficiency of haemoglobin in our bodies. 

What is the purpose of making urine in the human body?

Name the organs that store and release the urine.

What is the role of the brain in reflex action?

Name the function of cerebrum.

List in tabular form two differences between reflex action and walking. 

List in tabular form three distinguishing features between cerebrum and cerebellum.

How is the mode of action in beating of the heart different from reflex actions? Give four examples.

Name the hormone secreted in scary situations by animals. Write any three responses which enable the animal body to deal with it.

Sensory nerve of a reflex arc carries information from the receptor cells to the ______.

We are advised to take iodised salt in our diet by doctors. Justify its importance in our bodies.