English Medium कक्षा १० - CBSE Question Bank Solutions

Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the Figure Which of the following could be inside the box?

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the Figure. Which of the following could be inside the box?

Write the number of covalent bonds in the molecule of butane, C₄H₁₀.

List two reasons for the appearance of variations among the progeny formed by sexual reproduction

What are covalent compounds?

Why covalent compounds are different from ionic compounds?

List three characteristic properties of covalent compounds.

Explain why carbon forms compounds mainly by covalent bond.

Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds.

Name the type of bonds formed in ionic compounds and in the compounds formed by carbon.

Give reason why carbon compounds are generally poor conductors of electricity.

State the reason why carbon can neither form C⁴⁺ cations nor C⁴⁻ anions but forms covalent compounds.

State the reason to explain why covalent compounds "are bad conductors of electricity".

State the reason to explain why covalent compounds "have low melting and boiling points."

Why should a magnesium ribbon be cleaned before it is burnt in the air?

What is a balanced chemical equation? Why should a chemical equation be balanced?

Balance the chemical equation.

\[\ce{HNO3 +Ca(OH)2 -> Ca(NO3)2 + H2O}\]

Balance the following chemical equation.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Balance the following chemical equation.

\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]