Question 11 MarkThe gaseous product of the chemcial change which takes place during respiration in living organisms.Answer$\ce{CO_2}$ carbon dioxide.View full question & answer→
Question 21 MarkA form of energy required for a chemical change.AnswerGenerally $\text{HEAT ENERGY}$ is required but light, pressure or electricity can also be needed.View full question & answer→
Question 31 MarkThe product of the chemical change on keeping a polished iron nail exposed to the atmosphere.AnswerIron III oxide $\left[ \ce{Fe _2 O _2}\ \ce{\times\ H _2 O} \right]$View full question & answer→
Question 41 MarkThe product obtained during a physical change when water converts from a liquid into a solid.AnswerIce.View full question & answer→
Question 51 MarkThe salt obtained when a chemical change takes place on addition of iron to dilute sulphuric acid.Answer$\ce{FeSO_4 }($Iron Sulphate$)$View full question & answer→
Question 61 MarkWrite the correct answer Respiration $(A)$ Physical Change $(B)$ Chemical change:AnswerRespiration $- B$ : Chemical changeView full question & answer→
Question 71 MarkWrite the correct answer Magnetization $(A)$ Physical Change $(B)$ Chemical change:AnswerMagnetization $- A$ : Physical ChangeView full question & answer→
Question 81 MarkWrite the correct answer Liquefaction or condensation. $(A)$ Physical Change $(B)$ Chemical changeAnswerLiquefaction or condensation $- A$ : Physical ChangeView full question & answer→
Question 91 MarkWrite the correct answer Fermentation. $(A)$ Physical Change $(B)$ Chemical change:AnswerFermentation $- B:$ Chemical ChangeView full question & answer→
Question 101 MarkWrite the correct answer Sublimation. $(A)$ Physical Change $(B)$ Chemical change:AnswerSublimation $- A:$ Physical ChangeView full question & answer→
Question 111 MarkIs change of state of matter $–$ a physical or a chemical change. Give reasons.AnswerChange of state of matter is a $\text{PHYSICAL}$ change since on reversing the conditions, original state can be attained.View full question & answer→