Write a balanced equation for the following reaction :Methane burns in oxygen to form carbon dioxide

Convey the following information in the form of a balancedchemical equation :On adding an aqueous so

Write a balanced chemical equation with state symbols for the following reaction :Heated iron metal

Write the balanced equation for the following chemical reaction :Hydrogen + Chlorine 􀁿􀁿􀁯 Hydrogen ch

Translate the following statement into chemical equation and then balance theequation :Hydrogen gas

Write the balanced chemical equation for the following reaction :Sodium metal reacts with water to g

Write a balanced chemical equation for the following chemical reaction :Magnesium burns in oxygen to

Why is respiration considered an exothermic process ?

On what basis is a chemical equation balanced ?

Why should magnesium ribbon be cleaned before burning in air ?

State whether the following statement is true or false :A chemical equation can be balanced easily b

What is wrong with the following chemical equation ?Mg + O 􀁿􀁿􀁯 MgO

What does the symbol (aq) represent in a chemical equation ?

Why is photosynthesis considered an endothermic reaction ?

How will you indicate the following effects in a chemical equation ?(a) A solution made in water(b)

Translate the following statements into chemical equations and then balance the equations :(a) Hydro

Complete and balance the following equations :(a) NaOH + ............. 􀁿􀁿􀁯 Na2SO4 + H2O(b) Ca(OH)2 +

Correct and balance the following equations :(i) Ca + H2O 􀁿􀁿􀁯 CaOH + H(ii) N + H 􀁿􀁿􀁯 NH3

Write complete balanced equations for the following reactions :(a) Calcium (solid) + Water (liquid)

Balance the following equations :(i) Na + O2 􀁿􀁿􀁯 Na2O(ii) H2O2 􀁿􀁿􀁯 H2O + O2(iii) Mg(OH)2 + HCl 􀁿􀁿􀁯 M

Fill in the following blanks with suitable words :(a) Chemical equations are balanced to satisfy the

(a) Give one example of a chemical reaction.(b) State two characteristics of the chemical reaction w

(a) What is a chemical equation ? Explain with the help of an example.(b) Giving examples, state the

When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation fo

What happens chemically when quicklime is added to water filled in a bucket ?

Write the balanced chemical equations for the following reactions :(a) Calcium hydroxide + Carbon di

(a) What are the various ways in which a chemical equation can be made more informative ? Give examp

(a) Explain, with example, how the physical states of the reactants and products can be shown in a c

Write any two observations in an activity which may suggest that a chemical reaction has taken place

(a) Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a bal

Write the balanced equations for the following reactions, and add the state symbols :(a) Magnesium c

Carbon monoxide reacts with hydrogen under certain conditions to form methanol (CH3OH). Write a bala

(a) Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equa

(a) Substitute formulae for names and balance the following equation :Calcium carbonate reacts with

Ammonia reacts with oxygen to form nitrogen and water. Write a balanced chemical equation for this r

Write a balanced chemical equation for the process of photosynthesis giving the physical states of a

Translate the following statement into chemical equation and then balance it :Barium chloride soluti

When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced

One of the following does not happen during a chemical reaction. This is :(a) Breaking of old chemic

Which of the following does not involve a chemical reaction ?(a) digestion of food in our body(b) pr

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix w

An acid which can decolourise purple coloured potassium permanganate solution is :(a) sulphuric acid

The chemical reaction between two substances is characterised by a change in colour from orange to g

The chemical reaction between quicklime and water is characterised by :(a) evolution of hydrogen gas

One of the following is an endothermic reaction. This is :(a) combination of carbon and oxygen to fo

Which of the following is not an endothermic reaction ?(a) CaCO3 􀁿􀁿􀁯 CaO + CO2

The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This

A solution of substance X is used for white-washing.(i) Name the substance X and write its formula.(

Why is double the amount of a gas collected in one of the test-tubes in the electrolysisof water exp

What happens when dilute hydrochloric acid is added to iron filings ? Tick thecorrect answer :(a) Hy

Fe2O3 + 2Al 􀁿􀁿􀁯 Al2O3 + 2FeThe above reaction is an example of :(a) combination reaction(b) double d

Write the balanced chemical equations for the following and identify the type ofreaction in each cas

Below are given two chemical reactions :(i) 2KBr (aq) + Cl2 (aq) 􀁿􀁿􀁯 2KCl (aq) + Br2 (aq)(ii) Fe (s)

Name the substance oxidised and substance reduced in the following reaction :

Select the oxidising agent and the reducing agent from the following reaction :

Identify the substance that is oxidised and the substance that is reduced in thefollowing reaction :

Which of the statements about the reaction below are incorrect ?2PbO (s) + C (s) 􀁿􀁿􀁯 2Pb (s) + CO2 (

A shiny brown coloured element X on heating in air becomes black in colour. Namethe element X and th

What type of reaction is represented by the digestion of food in our body ?

Name the various types of chemical reactions.

Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?

Write the balanced chemical equation for the following reaction :Zinc + Silver nitrate 􀁿􀁿􀁯 Zinc nitr

Which term is used to indicate the development of unpleasant smell and taste in fat and oil containi

What is the general name of the chemicals which are added to fat and oil containing foods to prevent

State an important use of decomposition reactions.

What are anti-oxidants ? Why are they added to fat and oil containing foods ?

Explain why, food products containing fats and oils (like potato chips) are packaged in nitrogen.

Give one example of a decomposition reaction which is carried out :(a) with electricity(b) by applyi

What type of chemical reaction is used to extract metals from their naturally occurring compounds li

Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity.

Write one equation each for the decomposition reactions where energy is supplied in the form of (a)

In the refining of silver, the recovery of silver from silver nitrate solution involved displacement

What type of reactions are represented by the following equations ?(i) CaCO3 􀁿􀁿􀁯 CaO + CO2(ii) CaO +

What is an oxidation reaction ? Identify in the following reaction (i) the substance oxidised, and (

(a) What is a redox reaction ? Explain with an example.(b) When a magnesium ribbon burns in air with

What type of chemical reactions take place when :(a) a magnesium wire is burnt in air ?(b) lime-ston

What type of chemical reactions are represented by the following equations ?(i) A + BC 􀁿􀁿􀁯 AC + B(ii

Balance the following chemical equations :(a) FeSO4 􀁿H􀁿ea􀁿t􀁯 Fe2O3 + SO2 + SO3

Which of the following is a combination and which is a displacement reaction ?(a) Cl2 + 2KI 􀁿􀁿􀁯 2KCl

What type of reactions are represented by the following equations ?(a) CaO + CO2 􀁿􀁿􀁯 CaCO3(b) 2Na +

In the following reaction between lead sulphide and hydrogen peroxide :PbS (s) + 4H2O2 (aq) 􀁿􀁿􀁯 PbSO

Identify the component oxidised in the following reaction :H2S + Cl2􀁿􀁿􀁯 S + 2HCl

When SO2 gas is passed through saturated solution of H2S, the following reaction occurs :SO2 + 2H2S

Fill in the following blanks with suitable words :(a) The addition of oxygen to a substance is calle

(a) Define a combination reaction.(b) Give one example of a combination reaction which is also exoth

(a) Give an example of an oxidation reaction.(b) Is oxidation an exothermic or an endothermic reacti

(a) What is the colour of ferrous sulphate crystals ? How does this colour change after heating ?(b)

What is a decomposition reaction ? Give an example of a decomposition reaction. Describe an activity

Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced

Give one example of an oxidation-reduction reaction which is also :(a) a combination reaction(b) a d

(a) What is the difference between displacement and double displacement reactions ? Write equations

(a) Explain the following in terms of gain or loss of oxygen with one example each :(i) oxidation (i

(a) Define the following in terms of gain or loss of hydrogen with one example each :(i) oxidation (

What is meant by (a) displacement reaction, and (b) double displacement reaction ? Explain with the

(a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equa

(a) What happens when a piece of iron metal is placed in copper sulphate solution ? Name the type of

In the reaction represented by the following equation :CuO (s) + H2 (g) 􀁿􀁿􀁯 Cu (s) + H2O (l)(a) name

What happens when silver nitrate solution is added to sodium chloride solution ?(a) Write the equati

What happens when silver chloride is exposed to sunlight ? Write a chemical equation for this reacti

What happens when a zinc strip is dipped into a copper sulphate solution ?(a) Write the equation for

The removal of oxygen from a substance is called :(a) oxidation (b) corrosion (c) reduction (d) ranc

In the context of redox reactions, the removal of hydrogen from a substance is known as :(a) oxidati

The chemical reaction involved in the corrosion of iron metal is that of :(a) oxidation as well as d

The term used to indicate the development of unpleasant smell and taste in fat and oil containing fo

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere o

A white precipitate can be obtained by adding dilute sulphuric acid to :(a) CuSO4 solution (b) NaCl

A white precipitate will be formed if we add common salt solution to :(a) Ba(NO3)2 solution (b) KNO3

Consider the following equation of the chemical reaction of a metal M :4M + 3O2 􀁿􀁿􀁯 2M2O3This equati

The process of respiration is :(a) an oxidation reaction which is endothermic(b) a reduction reactio

Which of the following can be decomposed by the action of light ?(a) NaCl (b) KCl (c) AgCl (d) CuCl

Consider the reaction :KBr (aq) + AgNO3 (aq) 􀁿􀁿􀁯 KNO3 (aq) + AgBr (s)

You are given the following chemical equation :Mg (s) + CuO (s) 􀁿􀁿􀁯 MgO (s) + Cu (s)This equation rn