10 वी NCERT टेस्ट - सायन्स टेस्ट - चॅप्टर 1 - Chemical reactions and Equations
10 वी NCERT टेस्ट - सायन्स टेस्ट - चॅप्टर 1 - Chemical reactions and Equations
या ठिकाणी A आणि B हे Reactants आहेत तर C आणि D हे Products आहेत.
चॅप्टर 1 - Chemical reactions and Equations
Questions
Question 1
Which of the following is a physical change?
A) Burning of liquefied petroleum gas (LPG)
B) Ripping of paper
C) Ripening of fruit
D) Formation of curd from milk
Question 2
What happens chemically when quicklime is added to water?
A) It absorbs heat and forms slaked lime
B) It releases a large amount of heat and forms slaked lime
C) A pungent gas is evolved
D) No reaction takes place
Question 3
The chemical formula of slaked lime is:
A) CaO
B) Ca(OH)2
C) CaCO3
D) CaCl2
Question 4
Which of the following is a balanced chemical equation?
A) Fe + H2O --------> Fe3O4 + H2
B) 3Fe + 4H2O --------> Fe3O4 + 4H2
C) 3Fe + 4H2O --------> Fe3O4 + H2
D) 3Fe + H2O --------> Fe3O4 + 4H2
Question 5
Why is it necessary to balance a chemical equation?
A) To satisfy the law of conservation of momentum
B) To satisfy the law of conservation of mass
C) To satisfy the law of constant proportions
D) To make the calculation easier
अजून वाचून पहा : 10 वी NCERT टेस्ट - Contemporary India - Chapter 1 - Resources and Development
Question 6
Burning of magnesium ribbon in air is an example of a:
A) Decomposition reaction
B) Combination reaction
C) Displacement reaction
D) Double displacement reaction
Question 7
What is observed when a magnesium ribbon is burnt in air?
A) It burns with a dull red flame leaving a black powder
B) It burns with a dazzling white flame leaving a white powder
C) It burns producing yellow smoke
D) It melts without producing any flame
Question 8
The reaction C(s) + O2(g) --------> CO2(g) + Heat is a:
A) Endothermic and combination reaction
B) Exothermic and decomposition reaction
C) Exothermic and combination reaction
D) Endothermic and displacement reaction
Question 9
Respiration is considered as an:
A) Endothermic reaction
B) Exothermic reaction
C) Reduction reaction
D) Physical change
Question 10
Decomposition of vegetable matter into compost is an example of:
A) Endothermic reaction
B) Exothermic reaction
C) Reversible reaction
D) Oxidation reaction
Question 11
When lead nitrate powder is heated strongly in a boiling tube, we observe:
A) Evolution of oxygen gas only
B) Brown fumes of nitrogen dioxide gas
C) Yellowish fumes of sulfur dioxide
D) A white precipitate forming at the bottom
Question 12
The thermal decomposition of calcium carbonate yields:
A) Calcium metal and carbon dioxide
B) Calcium oxide and carbon dioxide
C) Calcium hydroxide and carbon monoxide
D) Calcium oxide and oxygen
Question 13
The reaction 2H2O(l) -------->Electricity 2H2(g) + O2(g) is an
example of:
A) Thermal decomposition
B) Electrolytic decomposition
C) Photolytic decomposition
D) Displacement reaction
Question 14
During the electrolysis of water, the gas collected at the cathode is:
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon dioxide
Question 15
Why are silver chloride crystals stored in dark-colored bottles?
A) To prevent decomposition by sunlight
B) To accelerate their oxidation
C) To avoid reaction with the glass container
D) Because they are highly volatile
Question 16
2AgBr(s) --------> Sunlight 2Ag(s) + Br2(g). This reaction is used in:
A) Thermite welding
B) Black and white photography
C) Extraction of gold
D) Making of mirrors
Question 17
When an iron nail is placed in a copper sulfate solution, the color of the
solution changes from:
A) Green to blue
B) Blue to light green
C) Colorless to blue
D) Blue to colorless
Question 18
Fe(s) + CuSO4(aq) --------> FeSO4(aq) + Cu(s). This reaction indicates
that:
A) Copper is more reactive than iron
B) Iron is more reactive than copper
C) Both metals have equal reactivity
D) Iron cannot displace copper
Question 19
Which of the following metals will not displace hydrogen from dilute
hydrochloric acid?
A) Zinc
B) Iron
C) Copper
D) Magnesium
Question 20
A reaction in which an insoluble solid substance (precipitate) is formed is
called a:
A) Precipitation reaction
B) Neutralization reaction
C) Combustion reaction
D) Exothermic reaction
Question 21
When sodium sulfate solution is mixed with barium chloride solution, a
white precipitate of which substance is formed?
A) Sodium chloride
B) Barium sulfate
C) Barium hydroxide
D) Sodium sulfate
Question 22
Double displacement reactions involve:
A) Exchange of ions between two compounds
B) Combination of two elements to form one compound
C) Evolution of heat only
D) Displacement of a less reactive metal by a more reactive metal
Question 23
Oxidation is a process which involves:
A) Gain of hydrogen
B) Loss of oxygen
C) Gain of oxygen
D) Gain of electrons
Question 24
In the reaction CuO + H2 --------> Heat (required) Cu + H2O, the
substance oxidized is:
A) CuO
B) H2
C) Cu
D) H2O
Question 25
A reaction in which both oxidation and reduction occur simultaneously is
called a:
A) Combination reaction
B) Redox reaction
C) Displacement reaction
D) Reversible reaction
Question 26
In the reaction MnO2 + 4HCl --------> MnCl2 + 2H2O + Cl2, MnO2 acts
as a/an:
A) Oxidizing agent
B) Reducing agent
C) Catalyst
D) Acid
Question 27
The slow eating up of metals by the action of air, moisture, or chemicals
on their surface is called:
A) Rancidity
B) Corrosion
C) Reduction
D) Calcination
Question 28
The reddish-brown coating formed on iron components when exposed to moist
air for a long time is chemically known as:
A) Ferrous oxide
B) Hydrated ferric oxide
C) Ferric chloride
D) Hydrated ferrous sulfate
Question 29
The oxidation of fats and oils in food materials resulting in an unpleasant
smell and taste is called:
A) Corrosion
B) Galvanization
C) Rancidity
D) Fermentation
Question 30
To prevent chips from getting oxidized, chip manufacturers flush the bags
with which gas?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Chlorine
इथून खाली टेस्ट द्यायला सुरुवात करायची आहे.
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