Laxmi Publications Chemistry Class 12. We covered all the Laxmi Publications Chemistry Class 12 in this post for free so that you can practice well for the exam.
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Laxmi Publications Chemistry Class 12 Objective for Students
In the OF2 molecule, the total number of bond pairs and lone pairs of electrons present respectively are
(A) 2, 8
(B) 2, 6
(C) 2, 9
(D) 2, 10
Option a – 2, 8
One-word answers are given for the following. Mark the incorrect answer.
(A) Allotropic form of sulphur which is more stable at room temperature – Rhombic.
(B) The hydride of group 16 which is liquid at room temperature – Water
(C) The gas formed in the upper layers of the atmosphere by the action of UV radiations – N₂.
(D) The catalyst used in the manufacturing of H₂SO4 by contact process- V₂05.
Option c – The gas formed in the upper layers of the atmosphere by the action of UV radiations – N₂
H₂SO4 reacts with PCl5 to give
(A) Thionyl chloride
(B) Sulphur monochloride
(C) Sulphur chloride
(D) Sulphur ultrachloride
Option c – Sulphur chloride
Ozone depletion due to the formation of the following compounds in Antarctica
(A) Acrolein
(B) Peroxy acetyl nitrate
(C) SO₂ and SO3
(D) Chlorine nitrate
Option d – Chlorine nitrate
When SO2 gas is passed through an acidified solution of K₂Cr₂O7
(A) Solution becomes blue
(B) Solution becomes colourless
(C) SO2 is reduced
(D) Green Cr₂(SO4)3 is formed
Option d – Green Cr₂(SO4)3 is formed
Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with H₂O2 to form another compound. The colour of the compound is
(A) Black
(B) Yellow
(C) White
(D) Pink
Option c – White
What is the hybridisation of S in SF?
(A) sp³d²
(B) sp³d
(C) sp³d³
(D) sp³
Option a – sp³d²
What is the hybridisation of sulphur in SF4?
(A) sp³d²
(B) sp³d
(C) sp³
(D) sp²d
Option b – sp³d
The chemical formula of buryte, the salt of sulphur is
(A) CaSO4 2H₂O
(B) MgSO4 7H₂O
(C) BaSO4
(D) CuFeS2
Option c – BaSO4
Peroxodisulphuric acid is known as
(A) Caro’s acid
(B) Marshall’s acid
(C) Sulphurous acid
(D) Dithionic acid
Option b – Marshall’s acid
Which one of the following reacts with conc. H₂SO4?
(A) Au
(B) Ag
(C) PT
(D) Pb
Option d – Pb
When SO2 is passed through bromine water products formed are
(A) H₂SO4 + HBr
(B) H₂O and HBr
(C) S and H₂O
(D) HBr and S
Option b – H₂O and HBr
In group 16 the photosensitive elements are
(A) Oxygen and Sulphur
(B) Oxygen and Tellerium
(C) Selenium and Tellerium
(D) Sulphur and Selenium
Option c – Selenium and Tellerium
In the laboratory method of preparation of dioxygen by thermal decomposition of potassium chlorate, the catalyst used is
(A) Iron fillings
(B) Manganese dioxide
(C) Platinum
(D) Copper chloride
Option b – Manganese dioxide
The type of hybridisation in a water molecule is
(A) sp
(B) sp²
(C) sp³
(D) sp³d
Option c – sp³
Oleum is chemically known as
(A) H₂SO3
(B) H₂SO5
(C) H₂S₂O7
(D) H₂S₂O8
Option c – H₂S₂O7
Caro’s acid is
(A) H₂SO3
(B) H3S2O5
(C) H₂SO5
(D) H₂S₂O8
Option c – H₂SO5
H₂S reacts with O₂ to form
(A) H₂O + S
(B) H₂O + SO2
(C) H₂O + SO3
(D) H₂SO4 + S
Option a – H₂O + S
We covered all the laxmi publications chemistry class 12 above in this post for free so that you can practice well for the exam.
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