Which of the following does not involve a chemical reaction?(a) digestion of food in our body(b) process of respiration(c) burning of candle wax when heated(d) melting of candle wax on heating

Academic Chemistry NCERT Class 10

Correct Answer: (d) melting of candle wax on heating.

Explanation: On heating, wax changes only its physical state (solid to liquid) but not its properties. Hence, it is a physical change.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

592 Views

Which of the following are physical changes and which are chemical changes ?Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Look at figure 6.1 which shows three situations(a) a burning candle(b) an extinguished candle(c) melting wax."
Why is a candle made of wax?
Which of the following are chemical changes?(a) Growth of a plant (b) Rusting of iron(c) Mixing of iron filings and sand (d) Cooking of food(e) Digestion of food (f) Freezing of water(g) Burning of a candle.
Classify the changes involved in the following processes as physical or chemical changes:(a) Photosynthesis(b) Dissolving sugar in water(c) Burning of coal(d) Melting of wax(e) Beating aluminium to make aluminium foil(f) Digestion of food\n22989"
What type of reaction is represented by the digestion of food in our body?
Classify the following as slow or fast change:(i) Bearing of heart(ii) Change of seasons(iii) Burning of paper(iv) Weathering of rocks(v) Melting of wax(vi) Cooking of food(vii) Burning of wax(viii) Melting of ice cream(ix) Curding of milk(x) Formation of day and night
The unused parts of the food in our body are ___.(a) Defacated(b) Digestion(c) Ingestion(d) None of these
Which of the following does not produces a flame on burning?
The process through which undigested food is expelled out of the body is called(a) digestion(b) absorption(c) assimilation(d) egestion
The process of digestion of food is humans begins in:(a) stomach (b) food pipe (c) mouth (d) small intestine
Is melting of a candle, a physical change or a chemical change or both. Explain why?
Which of the following is a physical change?Rusting of ironCombustion of magnesium ribbonBurning of candleMelting of wax
In which of the following, the identity of initial substance remains unchanged?(a) Curdling of milk(b) Formation of crystals by process of crystallization(c) Fermentation of grapes(d) Digestion of food
One of the following is an exothermic reaction. This is:(a) electrolysis of water(b) conversion of limestone into quicklime(c) process of respiration(d) process of photosynthesis

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements