35 chapter-wise textbook answers, written in board-exam style. Works offline.
Why should a magnesium ribbon be cleaned before burning in air?
Write a balanced equation for the reaction of hydrogen with chlorine and name the type of reaction.
What is a displacement reaction? Give one example.
Why does an aqueous solution of an acid conduct electricity?
What happens when a base reacts with a metal? Write one equation.
Why are ionic compounds solids with high melting points?
What is an alloy? Why is it useful?
Why does carbon form covalent bonds?
What is a homologous series? Give one example.
Differentiate between autotrophic and heterotrophic nutrition.
What are the components of transport system in human beings?
What is a reflex action? Draw the path of a reflex arc in words.
State the laws of reflection of light.
An object is placed 20 cm from a concave mirror of focal length 15 cm. Find the image distance.
State Ohm's law and write its mathematical form.
Why is tungsten used for filaments of electric lamps?
State Fleming's left-hand rule.