Subject: Science, asked on 26/4/18

## Solve this: 24. A, B and C are three elements which undergo following chemical reactions,   Answer the following questions with reasons.  (a)  Which element is the most reactive ? (b)  Which element is the least reactive ? (c)  What is the type of reaction listed above ?

Subject: Science, asked on 26/4/18

## Solve this: ​Q22. Write a balanced chemical equation for each of the following reactions and also classify them.              (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.              (b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.              (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas              (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water. Q23. What happens when iron nail is put inside copper sulphate solution? Write the reactions with observations.

Subject: Science, asked on 26/4/18

## Solve this:

Subject: Science, asked on 26/4/18

## Solve this:

Subject: Science, asked on 26/4/18

## Solve this: 11. Why the solution of silver nitrate becomes blue in colour after some time when copper turnings are added to it ? 12. Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved the identify the type of reaction.

Subject: Science, asked on 26/4/18

## 8. How can you say that respiration is an exothermic process? Name two biochemical reaction which are exothermic.

Subject: Science, asked on 26/4/18

## Solve this:

Subject: Science, asked on 26/4/18

## Solve this:

Subject: Science, asked on 26/4/18

## Solve this: Q.6. Write the balanced chemical equations for the following reactions. (a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate (b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide. (c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide ($C{u}_{2}{I}_{2}/CuI$), liberates iodine gas and also forms potassium sulphate.

Subject: Science, asked on 26/4/18

## Solve this: Short answer type questions  Grapes hanging on the plant do not ferment but after being plucked from the plant Can be  fermented Under what conditions do these grapes ferment? Is it a chemical or a physical​ change?

Subject: Science, asked on 25/4/18

## why corrosion requires acidic medium

Subject: Science, asked on 23/4/18

## Does all the reactions in this world take place in either an acidic medium or a basic medium?

Subject: Science, asked on 23/4/18

## Mam what is balanced chemical equation

Subject: Science, asked on 22/4/18

## Solve this : Write the reaction in equation and is the reaction endothermic or exothermic ? Q. Take about 2g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?   ​

Subject: Science, asked on 22/4/18

## CAN YOU PLEASE EXPLAIN THE BREAKDOWN OF CARBONIC ACID?

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