What are acidic and basic radicals?
5 chemical reactions in our daily life?
Why does not silver evolve hydrogen on reacting with dil H2So4 ?
What does reaction of Zinc and Sodium Hydroxide produce?
Does the reaction have anything to do with the reactivity of metals?
I need all chemical formulas and symbols of element and compounds
Can you give me 10 examples of combination reactions,double displacement,displacement and decomposotion.
PLEASE GIVE ME THE LIST OF BOTH BASIC AND ACIDIC RADICALS WITH THEIR SIGNS.. AND TELL HOW TO MAKE FORMULAS ..
Give the valency and atomic mass of the first 20 elements and other important elements.
in the electrolysis of water .
(i) Name the gas collected at the cathode and anode .
(ii) why is the volume of gas collected one electrode double of other ?
(iii) why is afew drops of dilute H2SO4 added to the water?
Q1. Write a balanced chemical equation to represent decomposition of lead nitrate on heating.what are brown fumes due to?
Give 3 differences between displacement reaction & double displacement reaction .
Why do we store silver chloride in dark coloured bottles?
How to balance the equation HNO3+Ca(OH)2=Ca(NO3)+H2O
what happens when copper sulphate crystals are heated?
Q1.GIVE ME AT LEAST 5 EXAMPLES OF EACH TYPE OF CHEMICAL REACTION?
why do silver articles become black after some time?
which of the following is a redox reaction -
a) CaCO3 - CaO + CO2
b) H2 + Cl2 - 2HCl
c) CaO + 2HCl - CaCl2 + H2O
d) NaOH + HCl - NaCl + H2O
MnO2 + 4 HCl --> MnCl2 + 2 H2O + Cl2
identify d substance oxidised,substance reduced,oxidizing agent nd reducing agent...
I.VERY SHORT ANSWER TYPE QUESTIONS: (1mark)
Q1.What type of chemical reaction takes place when chlorine gas is passed through an aqueous solution of Potassium bromide?
Q2.Which element is used for galvanization of iron?
Q3.Give the name of one natural and one synthetic antioxidant.
Q4.What is the significance of symbol ‘aq.’?
Q5.How many atoms of oxygen are present in 0.1 mole of water?
II.SHORT ANSWER TYPE I QUESTIONS: (2marks)
Q6.Why does milk become sour if kept for a long time?
Q7.What is the name of compound present in air that causes silver to tarnish? Give the reaction.
Q8.What is the colour of Ferrous sulphate crystals? How does this colour change upon heating?
Q9.What is an oxidation reaction? Give an example of oxidation reaction. Is oxidation an endothermic or exothermic reaction?
Q10. Can a displacement reaction be a redox reaction? Explain with an example.
Q11.With the help of an activity show that photo decomposition is an endothermic reaction.
III.SHORT ANSWER TYPE II QUESTIONS: (3marks)
Q12.When Lead nitrate is heated, which colour fumes are evolved? Also name the gas evolved.
Q13.A blue colour inorganic compound when heated with Hydrogen sulphide gives black precipitate and aqueous solution of Sulphuric acid. Write the balanced chemical equation.
Q14.Identify which one of the following is a chemical change with reason for the same:
1.souring of milk 2.evaporation of water 3.dissolution of sugar in water
Q15.Awhite salt on heating decomposes to give brown fumes and yellow residue is left behind. Name the salt; write the reaction involved and the type of reaction.
Q16.A Magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.
(i).Write the chemical formulae of X and Y
(ii).Write the balanced chemical equation when X is dissolved in water
Q17.When Calcium oxide is added to water taken in a beaker, rise in temperature is observed. However, when Barium hydroxide is mixed with Ammonium chloride, a fall in temperature is observed. Why?
IV.LONG ANSWER TYPE QUESTIONS: (5marks)
Q18.What is corrosion? Why do aluminum sheets not corrode easily? Why is a copper vessel covered with a green coating in the rainy season?
write a balanced equation for
Aluminium + Copper Chloride ----------- Aluminium chloride + copper
balance the equation
potassium nitrate --> potassium nitrite + oxygen
KNO3 ---> KNO2 + O2
(3 and 2 written down)
give 20 balanced chemical equations
Make a project report on types of chemical reaction , corrosion , rancidity .This is given in holiday how i can make and reapare and what is project report ?
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