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Free download in PDF CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE Class 10 Students.
(1)
The non-metal which is liquid at room temperature is:
[A]
Bromine
[B]
Helium
[C]
Mercury
[D]
Carbon
(2)
Ester is formed by the reaction between:
[A]
An acid and an alcohol
[B]
An acid and an alkene
[C]
An acid and a base
[D]
A base and an alcohol
Answer: An acid and an alcohol
(3)
The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:
[A]
21
[B]
19
[C]
18
[D]
20
(4)
Bauxite is an ore of
[A]
Iron
[B]
Aluminium
[C]
Mercury
[D]
Copper
(5)
The metal which is liquid at room temperature is
[A]
Mercury
[B]
Potassium
[C]
Bromine
[D]
Iodine
(6)
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as
[A]
Refining
[B]
Roasting
[C]
Smelting
[D]
Calcination
(7)
In electrolytic refining, the cathode is made up of
[A]
Metallic salt
[B]
Pure metal
[C]
Impure metal
[D]
None of these
(8)
In the given reaction, Al2O3 + NaOH → ……X…… + H2O What is element X?
[A]
NaAlO2
[B]
NaAl2O3
[C]
Na3Al
[D]
Na2O3
(9)
Which of the following represent the correct order of decreasing reactivity?
[A]
Mg > Al > Zn > Fe
[B]
Mg > Fe > Zn > Al
[C]
Mg > Zn > Al > Fe
[D]
Al > Zn > Fe > Mg
Answer: Mg > Al > Zn > Fe
(10)
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
[A]
Fe
[B]
Ca
[C]
C
[D]
None of these
(11)
Which of the following pairs will give displacement reactions?
[A]
AgNO3 solution and copper metal
[B]
FeSO4 solution and silver metal
[C]
NaCl solution and copper metal
[D]
MgCl2 solution and aluminium metal
Answer: AgNO3 solution and copper metal
(12)
Which among the following is the most abundant metal found in the earth’s crust?
[A]
Aluminium
[B]
Iron
[C]
Magnesium
[D]
Oxygen
(13)
Which of the following pairs of reactants will go undergo a displacement reaction?
[A]
Ca(SO4)2 + Fe
[B]
CuSO4 + Fe
[C]
ZnSO4 + Fe
[D]
MgSO4 + Fe
(14)
Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of
[A]
Zinc
[B]
Bauxite
[C]
Copper
[D]
Aluminum
(15)
Which of the following alloys contains a non-metal as one of its constituents?
[A]
Bronze
[B]
Brass
[C]
Steel
[D]
Amalgam
(16)
An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following:
[A]
Na
[B]
Ca
[C]
Mg
[D]
P
(17)
Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:
[A]
Citric acid
[B]
Lactic acid
[C]
Acetic acid
[D]
Oxalic acid
(18)
Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:
[A]
Remove the layer of magnesium carbonate from the ribbon surface
[B]
Remove the moisture from the ribbon surface
[C]
Make the ribbon surface shinier
[D]
Remove the layer of magnesium oxide from the ribbon surface
Answer: Remove the layer of magnesium carbonate from the ribbon surface
(19)
In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
[A]
Barium sulphate
[B]
Sulphur
[C]
Hydrochloric acid
[D]
Chlorine
(20)
The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:
[A]
Physical process
[B]
Endothermic process
[C]
Exothermic process
[D]
Reversible process
Answer: Exothermic process
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