Avart Sarni Chemistry. We covered all the Avart Sarni Chemistry in this post for free so that you can practice well for the exam.
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Avart Sarni Chemistry Objective for Students
The most abundant metal in the earth's crust is
(a) Si
(b) Fe
(c) Al
(d) Cu
Option c - Al
Consider the following elements. I. Cobalt II. Phosphorus III. Zinc Which of the above elements are required for maintaining the healthy human body?
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Option d - I, II and III
Which one of the following elements is kept safely in kerosene oil?
(a) Sodium
(b) Copper
(c) Mercury
(d) Silver
Option a - Sodium
Why do alkali metals impart colour to the flame?
(a) They are electropositive elements.
(b) They have low ionisation energies.
(c) They belong to IA group.
(d) They form ionic compounds.
Option b - They have low ionisation energies
What is the chemical formula for Sodium Chloride (Salt)?
(a) NaCl₂
(b) NaCl
(c) Na₂Cl
(d) Na₂C
Option b - NaCl
Which one of the following is the chemical formula of Washing Soda?
(a) NaHCO3
(b) Na₂CO3 10H₂O
(c) Na₂CO3 5H₂O
(d) NaOH
Option b - Na₂CO3 10H₂O
Sodium calcium silicate is called ……
(a) hard glass
(b) borosilicate glass
(c) soft glass
(d) jena glass
Option c - soft glass
Which of the following elements has the lowest melting point?
(a) Sodium
(b) Tin
(c) Radon
(d) Radium
Option c - Radon
What is the product formed when sodium bicarbonate is heated strongly?
(a) Sodium Carbonate
(b) Sodium Hydroxide
(c) Sodium Peroxide
(d) Sodium Monoxide
Option a - Sodium Carbonate
Which is the most reactive metal?
(a) Sodium
(b) Calcium
(c) Iron
(d) Potassium
Option d - Potassium
Heaviest metal of the following is made of
(a) Copper
(b) Uranium
(c) Aluminium
(d) Silver
Option b - Uranium
Which one of the following materials is very hard and very ductile?
(a) Carborundum
(b) Tungsten
(c) Cast iron
(d) Nichrome
Option d - Nichrome
Which of the following is the electron configuration of a metallic element?
(a) 2, 8
(b) 2, 8, 7
(c) 2, 8, 8
(d) 2, 8, 8, 2
Option d - 2, 8, 8, 2
Which one of the following is the hardest metal?
(a) Gold
(b) Iron
(c) Platinum
(d) Tungsten
Option c - Platinum
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