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Free download in PDF CBSE Class 10 Science Objective Type Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
(21)
The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below:
The reducing and oxidizing agents involved in this redox reaction are:
[A]
Hydrogen sulphide and sulphur
[B]
Sulphur and iodine respectively
[C]
Iodine and hydrogen sulphide respectively
[D]
Iodine and sulphur respectively
Answer: Iodine and hydrogen sulphide respectively
(22)
The neutralization reaction between an acid and a base is a type of:
[A]
Decomposition reaction
[B]
Displacement reaction
[C]
Addition reaction
[D]
Double displacement reaction
Answer: Double displacement reaction
(23)
The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
[A]
Sodium pellets
[B]
Aluminium dust
[C]
Copper granules
[D]
Magnesium ribbon
(24)
Which of the following gases is used in the storage of fat and oil containing foods for a long time?
[A]
Nitrogen gas
[B]
Neon gas
[C]
Oxygen gas
[D]
None of these
(25)
When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:
[A]
Green to brown.
[B]
Green to yellow.
[C]
Green to blue.
[D]
Blue to green.
(26)
Rusting of iron involves a chemical reaction which is a combination of:
[A]
Oxidation as well as combination reactions
[B]
Oxidation as well as displacement reactions
[C]
Reduction as well as combination reactions
[D]
Reduction as well as displacement reactions
Answer: Oxidation as well as combination reactions
(27)
It is necessary to balance a chemical equation in order to satisfy the law of:
[A]
Conservation of mass
[B]
Conservation of energy
[C]
Conservation of motion
[D]
Conservation of momentum
Answer: Conservation of mass
(28)
One of the following processes does not involve a chemical reaction. That is:
[A]
Melting of candle wax when heated
[B]
Ripening of banana
[C]
Burning of candle wax when heated
[D]
Digestion of food in our stomach
Answer: Melting of candle wax when heated
(29)
Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:
[A]
Blue to white
[B]
Blue to grey
[C]
Blue to green
[D]
Blue to sky blue
(30)
Which one of the following salts will dissolve in water to form an alkaline solution?
[A]
Potassium carbonate
[B]
Potassium sulphate
[C]
Sodium chloride
[D]
Sodium carbonate
Answer: Potassium carbonate
31
Bleaching powder is used as a disinfectant for water to:
[A]
Make water germ-free
[B]
Make water clear
[C]
Make water tastier
[D]
Remove all the dirt from water
Answer: Make water germ-free
32
In the following reaction, identify the salt formed
NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O (l)
[A]
NH4NO3
[B]
(NH4)2SO4
[C]
(NH4)2S
[D]
(NH4)3PO4
33
An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin.
Choose the correct option from the following to be filled in the blank space:
[A]
Baking soda
[B]
Caustic soda
[C]
Methanoic acid
[D]
formic acid
34
Dilute acid does not produce carbon dioxide on being treated with:
[A]
Lime
[B]
Limestone
[C]
Marble
[D]
Baking soda
35
Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.
[A]
X- Hydrochloric acid and Y- Hydrogen gas
[B]
X- Sulphuric acid and Y- Hydrogen gas
[C]
X- Sulphuric acid and Y- Oxygen gas
[D]
X- Hydrochloric acid and Y- Oxygen gas
Answer: X- Sulphuric acid and Y- Hydrogen gas
36
From which of the following substance pencil lead is formed?
[A]
Graphite
[B]
Lead
[C]
Charcoal
[D]
None of these
37
The organic compounds having functional group are known as:
[A]
Alcohol
[B]
Carboxylic acids
[C]
Aldehyde
[D]
Ketone
38
Which of the followings is the major constituent of the liquefied petroleum gas?
[A]
Butane
[B]
Propane
[C]
Ethane
[D]
Methane
39
How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene?
[A]
60
[B]
120
[C]
30
[D]
90
40
Which of the following statements about graphite and diamond is true?
[A]
They can undergo the same chemical reactions
[B]
They have the same electrical conductivity
[C]
They have the same crystal structure
[D]
They have the same degree of hardness
Answer: They can undergo the same chemical reactions
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