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Chemical Reaction
Chemical Reaction
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Question 1 |
A lustrous white silver plate , is exposed to the atmosphere for several days. Which of the following statement is incorrect?
The silver plate gets tarnished | |
A black coating is formed due to the formation of silver sulphide | |
The silver plate is unaffected | |
The shape of the silver plate is altered |
Question 2 |
To an aqueous solution of lead nitrate , in a beaker, an aqueous solution of potassium iodide is added. Choose the correct statements .................
- a yellow precipitate of lead iodide is formed
- this is an example of double decomposition reaction
- the resultant mixture is a colourless solution
- this is an displacement reaction
1 and 2 | |
3 and 4 | |
1 and 3 | |
2 and 3 |
Question 3 |
To a pinch of powdered calcium carbonate in a test tube, a few drops of dilute hydrochloric acid is added which of the following statement is correct ..............
- chlorine gas is liberated
- calcium carbonate and hydrochloric acid are the reactants
- calcium chloride carbondioxide and H2O are the products
- no change is observed
1 and 2 | |
3 and 4 | |
1 and 3 | |
2 and 3 |
Question 4 |
Which of the following is a decomposition reaction?
heating ammonium-di-chromate at high temperature, | |
mixing copper sulphate solution and barium chloride solution | |
placing zinc rod into a solution of copper sulphate | |
adding water to quick lime |
Question 5 |
Choose the combination reaction ............
extraction of a metal | |
burning of metals | |
addition of a more active metal to a solution of less active metal compound | |
electrolysis |
Question 6 |
Identify the double decomposition reaction ....................
hydrogen burns in air | |
electrolysis of water | |
digestion of food in our body | |
addition of dilute sulphuric acid to barium chloride solution |
Question 7 |
Fe2O3 + 2Al Al2O3 + 2Fe2. This reaction is an example of .................
combination reaction | |
double displacement reaction | |
decomposition reaction | |
displacement reaction |
Question 8 |
Choose the exothermic reaction from the following ..............
a detergent is dissolved in water | |
glucose is kept on our tongue | |
ammonium chloride is dissolved in water | |
all the above |
Question 9 |
In a redox reaction ...............
an oxidising agent gets reduced | |
a reducing agent gets oxidised | |
both oxidation and reduction occur together | |
all the above |
Question 10 |
During a chemical reaction which takes place in solution, .........................
the concentration of the reactant increases | |
the concentration of the product decreases | |
the concentration of the reactant decreases | |
the concentration of the reactant does not change |
Question 11 |
Choose the correct statement ........................
magnesium ribbon reacts faster in hydrochloric acid | |
magnesium ribbon reacts faster in acetic acid | |
magnesium ribbon reacts slower in hydrochloric and faster in acetic acid | |
hydrogen gas is involved at the same rate when magnesium ribbon is allowed to react separately with hydrochloric acid and acetic acid |
Question 12 |
In which of the following , the rate of reaction is faster?
dissolution of calcium carbonate in hydrochloric acid at room temperature | |
dissolution of calcium carbonate in hydrochloric acid at 40oC | |
dissolution of calcium carbonate in dilute hydrochloric acid at 40oC | |
all the above |
Question 13 |
Consider acetic acid and hydrochloric acid. Choose the correct statement.
both acetic and hydrochloric acids are strong acids | |
both acetic and hydrochloric acids are weak acids | |
acetic acid is a stronger acid than hydrochloric acid | |
hydrochloric acid is a stronger acid than acetic acid |
Question 14 |
You have two solutions of hydrochloric acid solution A contains 36.5 g of hydrochloric acid is one litre of the solution. Solution B contains 3.65g hydrochloric acid is one litre of the solution. Among solution A and B ...................
A is a stronger acid than B | |
B is a stronger acid than A | |
Both are equally strong | |
A is a weaker acid than B |
Question 15 |
Which of the following react with hydrochloric acid but not with sodium hydroxide?
calcium oxide, ammonium hydroxide | |
sodium oxide, carbon-di-oxide | |
sodium oxide, ammonium hydroxide | |
Sodium oxide, magnesium hydroxide |
Question 16 |
Which of the following reactions is not feasible/
Passing carbon-di-oxide gas through an aqueous solution of sodium carbonate | |
Adding a piece of aluminium metal in an aqueous solution of sodium hydroxide | |
Adding sulphuric acid to powdered copper carbonate | |
Adding sodium hydroxide to a calcium oxide |
Question 17 |
Lemon juice has pH 2. Tomato juice has pH 4. Toothpaste has a pH 9. Choose the correct statement
Toothpaste is acidic , while both lemon juice and tomato juice are alkaline | |
Toothpaste and lemon juice are alkaline while tomato juice is acidic | |
Toothpaste is alkaline while both tomato and lemon juice are acidic | |
all are acidic |
Question 18 |
A solution turns red litmus blue. Its pH would be ..............
2 | |
4 | |
7 | |
9 |
Question 19 |
Which of the following is a characteristic of an acid salt?
Acid salts dissolve in water giving H+ ions | |
Acid salts are formed by adding calculated amount of a base to a poly basic acis | |
Acid salts are formed by the partial replacement of hydrogen ions ions ina polybasic acid | |
All the above |
Question 20 |
The formation of calcium hydroxide from calcium oxide and water is an example of ........................ reaction
combination | |
double decomposition | |
decomposition | |
displacement |
Question 21 |
the reaction between an aqueous solution of lead nitrate and dilute hydrochloride in ...................... reaction.
double decomposition | |
combination | |
precipitation | |
oxidation |
Question 22 |
The reaction between aqueous solution of sodium sulphate and barium chloride is ...................... reaction.
precipitation | |
redox | |
simple displacement | |
decomposition |
Question 23 |
The decomposition of potassium chlorate is faster in the presence of manganese dioxide. Manganese dioxide acts as a ..................
reactant | |
catalyst | |
oxidising agent | |
reducing agent |
Question 24 |
.......................... react faster in dilute hydrochloric acid.
powder calcium carbonate | |
Marble | |
Iron rod | |
Crystalline sodium chloride |
Question 25 |
A red litmus paper is dipped in moist chlorine . Its colour ..............
changes to blue | |
remain red | |
changes to green | |
changes to orange |
Question 26 |
A neutral solution will have pH ..............
7 | |
less than 7 | |
between 6-7 | |
between 7-8 |
Question 27 |
Among distilled water and 1 M NaOH, the one having the maximum pH is ............
distilled water | |
1 M NaOH | |
0.1 M HCl | |
0.1 m NaOH |
Question 28 |
The gas obtained when crystals of ammonium dichromate is heated in ...............
chromium trioxide | |
metallic chromium | |
ammonium chromate | |
chromic acid |
Question 29 |
........................ will react with dilute hydrochloric acid faster than marble chips.
Powdered calcium carbonate | |
sodium metal | |
iron rod | |
magnesium ribbon |
Question 30 |
Magnesium ribbon reacts slower in ..................... than in hydrochloric acid.
sulphuric acid | |
nitric acid | |
acetic acid | |
water |
Question 31 |
An example of an organic acid is .......................
formic acid | |
hydrochloric acid | |
sulphuric acid | |
nitric acid |
Question 32 |
The number of hydrogen ions per molecule in a tribasic acid is ............
1 | |
2 | |
3 | |
4 |
Question 33 |
The constituent present in baking powder is .......................
sodium benzoate | |
acetic acid | |
sodium lactate | |
tartaric acid |
Question 34 |
The pOH of a solution containing [OH-] concentration 10-3 M is .....................
3 | |
2 | |
11 | |
14 |
Question 35 |
A solution containing sodium hydroxide has a concentration 1.0 x 10-9 M. The pH of the solution is ........................
9 | |
5 | |
4 | |
8 |
Question 36 |
The acid which has an approximate pH range 2.2 to 2.4 is .......................
tomato juice | |
coffee | |
lemon juice | |
lemon saliva |
Question 37 |
The ideal pH value of the blood is ...............
0.5 | |
5.5 | |
4.5 | |
7.4 |
Question 38 |
Cu(OH)Cl is an example of ...................
acidic salt | |
basic salt | |
neutral salt | |
double salt |
Question 39 |
An aqueous of magnesium oxide is .................
acidic | |
alkaline | |
neutral | |
negative |
Question 40 |
Reduction involves addition of ....................
protons | |
electrons | |
atoms | |
molecular |
Question 41 |
Combustion reaction are ........................... reactions.
endothermic | |
exothermic | |
combination | |
reduction |
Question 42 |
On heating the green colour copper carbonate changes into ...................... colour resulting the formation of copper oxide.
white | |
black | |
green | |
red |
Question 43 |
If the value of pOH of a substance is 3, its pH is ...............
3 | |
11 | |
14 | |
1 |
Question 44 |
An example for strong acid is ..................
hydrochloric acid | |
acetic acid | |
malic acid | |
citric acid |
Question 45 |
The acid used in the preparation of cool drinks is ..............
sulphuric acid | |
carbonic acid | |
tartaric acid | |
hydrochloric acid |
Question 46 |
The alkali that is used as medicine for stomach troubles is ..............
sodium hydroxide | |
calcium hydroxide | |
magnesium hydroxide | |
carbon hydroxide |
Question 47 |
...................... is used to grease stains from clothes.
Potassium hydroxide | |
Aluminium hydroxide | |
Ammonium hydroxide | |
Silver hydroxide |
Question 48 |
In a particular chemical reaction, two electrons are gained that is known as a/an ....................
oxidation | |
reduction | |
decomposition | |
displacement |
Question 49 |
If heat is evolved in a particular chemical reaction, it is said to be an ...................
endothermic | |
exothermic | |
oxidation | |
decomposition |
Question 50 |
When glucose is kept in our tongue, a chilling effect is felt, this is an example for ...................
endothermic | |
exothermic | |
combustion | |
oxidation |
Question 51 |
Acid present in gape is ...............
malic acid | |
tartaric acid | |
oxalic acid | |
citraic acid |
Question 52 |
For human blood the pH range is ................. to ................
4.5- 6 | |
6.5-7.5 | |
7.35 – 7.45 | |
4.4 – 5.5 |
Question 53 |
Metal + Acid Salt + ......................
Oxygen | |
Water | |
Carbon | |
Hydrogen |
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