Types of Redox Reactions
Trending Questions
Boojho took some grains of boiled rice in a test tube a and paheli took boiled and chewed rice in a test tube b. both of them poured-1-2-drops of iodine solution into the test tube. What colour change would they have observed. Give reasons for your answer.
What do you understand by 'chemical reaction' ?
Several blocks of magnesium are fixed to the bottom of a ship to
Keep away the sharks
Make the ship lighter
Prevent action of water and salt
Prevent puncturing by under-sea rocks
Iodine gives blue-black colour with
Protein
Oil
Starch
Sucrose
Which one of the following is not a chemical change?
Formation of curd
Ripening of banana
Sublimation of naphthalene
Corrosion of photo frame
What happens when a physical change takes place in a substance?
Mass of the substance changes.
A new product is formed.
Properties like state, colour may change.
Chemical composition of a substance changes.
- Zinc ion
- Gold ion
- Copper ion
- Sodium ion
State the laws of chemical combination and define each?
(A) Reflected
(B) Scattered
(C) Absorbed
2A + B → A2B
Which of the following statements concerning this reaction are correct?
i) The product A2B shows the properties of substances A and B.
ii) Formation of A2B is a chemical change.
iii) The product so formed is a homogenous mixture.
iv) The product so formed cannot be classified as a compound.
A) i and iii
B) i, ii, and iv
C) Only ii
- What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen?
- Which law of chemical combinations will govern your answer?
(A) Suspension > Colloid > Solution
(B) Solution > Colloid > Suspension
(C) Solution > Suspension > Colloid
(D) Suspension > Solution > Colloid
When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. What is the pH range of the aqueous solution when the gas is dissolved in water?
- physical
- chemical
- physical and chemical
- biological
CaO(s)+H2O (l)→Ca(OH)2(aq)+Heat
What can be inferred from the above reaction?
- The given reaction is exothermic in nature.
- Water (H2O) is in vapour state.
- Calcium oxide (CaO) is solid.
- Calcium hydroxide [Ca(OH)2] is aqueous in nature.
CaO(s)+H2O (l)→Ca(OH)2(aq)+Heat
What can be inferred from the above reaction?
- The given reaction is exothermic in nature.
- Calcium oxide (CaO) is solid.
- Water (H2O) is in vapour state.
- Calcium hydroxide [Ca(OH)2] is aqueous in nature.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1651646/original_ss7.jpg)
(A) Vinegar
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1651650/original_ss8.jpg)
(B) Milk
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1651655/original_ss9.jpg)
(C) Mud in water
Milk is a colloid. Select the correct statement regarding milk as colloidal solution.
A solid is dispersed in liquid.
A gas is dispersed in liquid.
A liquid is dispersed in liquid.
A liquid is dispersed in solid
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1629194/original_Screenshot_2022-04-18_133702.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1628804/original_Picture10.jpg)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1628814/original_Picture9.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1628820/original_Picture11.jpg)
(A) (i) and (ii)
(B) (ii) and (iv)
(C) Only (ii)
(D) Only (iv)
3Br2+6CO2−3+3H2O→5Br⊖+BrO⊖3+6HCO⊖3
(IIT-JEE, 1996)
- Br2 is oxidised and CO2−3 is reduced.
- Br2 is reduced and H2O is oxidised.
- Br2 is neither reduced nor oxidised.
- Br2 is both reduced and oxidised.
The reaction, 3ClO−(aq)⟶ClO−3(aq)+2Cl−(aq) is an example of:
Oxidation reaction
Reduction reaction
Disproportionation Reaction
Decomposition reaction
Statement 1: The change in which one or more substances lose their identity and form one or more new substances are known as chemical changes.
Statement 2: Process of rolling dough is an example of physical change.
- (NH4)2Cr2O7 → N2 + Cr2O3 + 4 H2O
- P4 + 3 NaOH + 3 H2O → PH3 + 3 NaH2PO2
- Ag2+ + Ag → 2 Ag++
- 2FeCl2 + 2HCl + H2O2 → 2FeCl3 + 2H2O
- John Dalton
- Joseph Proust
- Antoine Lavoisier
- Ernest Rutherford
Statement 2: New substances are formed during chemical changes.
- Both statements are false.
- Only statement 1 is true.
- Only statement 2 is true.
- Both statements are true.
- Cutting of paper
- Folding of paper
- Twisting of paper
- Burning of Paper
I⊖+ClO⊖3+H2SO4→Cl⊖+HSO−4+I2
The correct statement(s) in the balanced equation is/ are:
(IIT-JEE-Advanced 2014)
- Stoichiometric coefficient of HSO−4 is 6.
- Iodide is oxidized.
- Sulphur is reduced.
- H2O is one of the products.
- Twisting of paper
- Burning of Paper
- Folding of paper
- Cutting of paper