HSST Chemistry Previous Question Papers. We covered all the HSST Chemistry Previous Question Papers in this post for free so that you can practice well for the exam.
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HSST Chemistry Previous Question Papers Objective for Students
In zinc blende structure, the coordination number of the cations is
(A) 4
(B) 6
(C) 8
(D) 12
Option a – 4
Cu crystallizes with FCC structure lattice. It has a co-ordination number that is
(A) 4
(B) 1
(C) 12
(D) 2
Option c – 12
The ratio of close-packed atoms to tetrahedral holes in cubic packing is
(A) 1 : 1
(B) 1 : 2
(C) 2 : 1
(D) 1 : 3
Option b – 1 : 2
The ratio of close-packed atoms to octahedral holes in cubic packing is
(A) 1 : 1
(B) 1 : 2
(C) 2 : 1
(D) 1 : 3
Option a – 1 : 1
Solid with high electrical and thermal conductivity from the following is
(A) Si
(B) Li
(C) NaCl
(D) Ice
Option b – Li
Most crystals have good cleavage because their atoms, ions, or molecules are
(A) Weakly bound together
(B) Strongly bound together
(C) Spherically symmetrical
(D) Arranged in planes
Option d – Arranged in planes
The limiting radius for tetrahedral geometry is
(A) 0 – 0.154
(B) 0.225 – 0.414
(C) 0.154 – 0.225
(D) 0.414 – 0.732
Option b – 0.225 – 0.414
When certain crystals produce electric signals by applying pressure. It is called
(A) Pyroelectricity
(B) Ferroelectricity
(C) Piezoelectricity
(D) Ferrielectricity
Option c – Piezoelectricity
In a crystal state iodine molecules are held together by
(A) Coulombic force
(B) Dispersion force
(C) Dipole-dipole force
(D) Ion dipole force
Option b – Dispersion force
The Schottky defect is observed when
(A) an Unequal number of cations and anions are mixing from the lattice.
(B) An equal number of cations and anions are mixed from the lattice.
(C) Ions leave lattice sites and occupy interstitial sites.
(D) The density of the crystal increases.
Option b – An equal number of cations and anions are mixed from the lattice
When NaCl is added to water
(A) the Freezing point is raised
(B) the Boiling point is depressed
(C) F.P. does not changes
(D) B.P. is raised
Option d – B.P. is raised
When the partial pressure of the solvent in a solution of non-volatile solute is plotted against its mole fraction, the nature of the graph is
(A) A straight line passing through the origin
(B) a Straight line parallel to the mole fraction of solvent
(C) a Straight line parallel to V.P. of solvent
(D) Straight line intersecting V.P. axis
Option a – A straight line passing through the origin
Lowering in V.P. of solution
(A) Is a property of solute
(B) Is a property of the solvent
(C) Is a colligative property.
(D) Is a property of solute and solvent.
Option c – Is a colligative property
The vapor pressure of a solution of a nonvolatile solute is always
(A) Equal to V.P. of solvent
(B) Higher than V.P. of solvent
(C) Lower than V.P. of solvent
(D) Constant
Option c – Lower than V.P. of solvent
The solution which gives the highest elevation in B.P. is
(A) 1 M AIPO4
(B) 0.05 M NaCl
(C) 0.1 M MgSO4
(D) 0.1 M KCI
Option a – 1 M AlPO4
Relative lowering in vapor pressure depends on
(A) the Nature of the solvent
(B) the Nature of the Solute
(C) the Mole fraction of the solute
(D) the Mole fraction of solvent
Option c – the Mole fraction of the solute
Azeotropic mixtures are
(A) Constant temperature boiling mixtures
(B) These solutions boil at different temperatures.
(C) A mixture of two solids
(D) None of these
Option d – None of these
Relative lowering in vapor pressure of 6 g urea in 108 g of water would be
(A) 0.164
(B) 0.18
(C) 0.33
(D) 0.0164
Option d – 0.0164
Two isotonic solutions with the same solvent will have
(A) the Same B.P. but a different F.P.
(B) the Same F.P. but a different B.P.
(C) Different B.P. and F.P.
(D) the Same B.P. and F.P.
Option d – the Same B.P. and F.P.
When a substance is dissolved into a solvent the vapor pressure of the solvent decreases. This results in
(A) an increase in the B.P. of the solution
(B) a Decrease in the B.P. of the solution
(C) the Solution having a higher F.P. than the pure solvent.
(D) The solution has a lower F.P. than the pure solvent.
Option a – an increase in the B.P. of the solution
The solution which shows positive or negative deviation from Raoult’s law is
(A) Ideal solution
(B) Real solution
(C) Nonideal solution
(D) True solution
Option c – Nonideal solution
The enthalpies of the formation of compound
(A) are Always Negative
(B) Always positive
(C) may be positive or negative
(D) Never negatives
Option c – may be positive or negative
Enthalpy of sublimation of a substance is equal to
(A) Enthalpy of fusion + enthalpy of vaporization
(B) Enthalpy of fusion
(C) Enthalpy of vaporization
(D) Twice of enthalpy of vaporization
Option a – Enthalpy of fusion + enthalpy of vaporization
When water is added to quick lime the reaction is
(A) Explosive
(B) Endothermic
(C) Exothermic
(D) Photochemical
Option c – Exothermic
Heat exchanged in a chemical reaction at constant temperature and pressure is called
(A) Internal energy
(B) Enthalpy
(C) Entropy
(D) Free energy
Option b – Enthalpy
The enthalpy of the combustion of sucrose is 1350 kcal. How much heat is evolved when 17.1 g of sucrose is burnt?
(A) 67.5 Kcal
(B) 13.5 Kcal
(C) 40.5 Kcal
(D) 25.5 K cal
Option a – 67.5 Kcal
An exothermic reaction is spontaneous at
(A) Low temperature
(B) High temperature
(C) at 0°C
(D) greater than 100°C
Option a – Low temperature
The Enthalpy of a compound is equal to its
(A) Heat of formation
(B) Heat of combustion
(C) Heat of formation with opposite sign
(D) the heat of combustion with opposite sign
Option a – Heat of formation
The same weights of the gases are allowed to expand isothermal and reversibly from 10 dm³ to 25 dm³ differently. The work done is maximum under the same condition for
(A) N₂
(B) 02
(C) CO2
(D) C3H8
Option a – N₂
Through the reaction of benzene and chlorine in the presence of catalyst say iron, which of the following would be obtained?
(a) Benzene hexachloride
(b) Benzylchloride
(c) Chloro benzene
(d) Benzoyl chloride
Option c – Chloro benzene
The gas produced through the pouring water on the calcium carbide is
(a) methane
(b) ethane
(c) ethylene
(d) acetylene
Option d – acetylene
Which one among the following fuels is used in gas welding?
(a) LPG
(b) Ethylene
(c) Methane
(d) Acetylene
Option d – acetylene
Which one of the following is burned in oxygen, producing a very hot flame, used for welding and cutting metals?
(a) Butane
(b) Methane
(c) Ethylene
(d) Acetylene
Option d – acetylene
Acetylene is used as an anaesthetic under the name of
(a) narcylene
(b) pyrene
(c) neopyrene
(d) pyroline
Option a – narcylene
The Teflon plastic is prepared by the polymerization of
(a) ethylene
(b) acetylene
(c) benzene
(d) tetrafluoro ethylene
Option d – tetrafluoro ethylene
To weld metals together, high temperature required such a high temperature is obtained by burning
(a) acetylene in oxygen.
(b) LPG in oxygen.
(c) methane in oxygen.
(d) acetylene in nitrogen.
Option a – acetylene in oxygen
The pure form of amorphous carbon is
(a) Diamond
(b) graphite
(c) charcoal
(d) fullerene
Option c – charcoal
Ethanol containing 5% water is known as
(a) rectified spirit
(b) absolute alcohol
(c) dilute alcohol
Option a – rectified spirit
The antiseptic action of the dettol is due to the presence of
(a) chlorobenzol
(b) chloroxylenol
(c) chloroquine
(d) chloroamphenicol
Option b – chloroxylenol
An organic compound is used in making picric acid (explosive), phenolphthalein (an indicator), bakelite, salol, aspirin, salicylic acid, etc. The organic compound is
(a) benzene
(b) phenol
(c) nitrobenzene
(d) aniline
Option b – phenol
Which of the following the gas causes the explosion in coal mines?
(a) Carbon dioxide
(b) Nitrogen
(c) Butane
(d) Methane
Option d – Methane
Which of the following ore is concentrated by the froth floatation process?
(a) Haematite
(b) Carnalite
(c) Sphalerite
(d) Calamine
Option c – Sphalerite
The froth floatation process for the concentration of ores is an illustration of the practical application of
(a) absorption
(b) adsorption
(c) sedimentation
(d) coagulation
Option b – adsorption
If the ore is soluble in some suitable solvent but impurities are not, then the most suitable method of concentration of ore is
(a) leaching
(b) froth floatation method
(c) hydraulic washing
(d) None of the above
Option a – leaching
The concentrated ore is generally converted into oxides because
(a) oxides are generally unstable.
(b) oxides generally have high melting points.
(c) oxides are easier to reduce.
(d) All of the above
Option c – oxides are easier to reduce
The true statement about the roasting process is
(a) impurities are removed as their volatile oxide.
(b) ore is converted into its oxide.
(c) processes like oxidation, chlorination, etc, take place.
(d) All of the above
Option d – All of the above
Sulfide ores are common for the metals
(a) Ag, Cu and Pb
(b) Ag, Cu and Sn
(c) Ag, Mg and Pb
(d) Al, Cu and Pb
Option a – Ag, Cu and Pb
Which of the following is a true statement regarding calcination?
(a) The ore is heated strongly in the absence of any blast of air.
(b) The ore is heated with calcium.
(c) The ore is heated with carbon.
(d) The mineral is melted with limestone.
Option a – The ore is heated strongly in the absence of any blast of air
The chemical process in the production of steel from haematite ore involves
(a) oxidation
(b) reduction
(c) oxidation followed by reduction
(d) reduction followed by oxidation
Option c – oxidation followed by reduction
Chemical leaching is useful in the concentration of
(a) copper pyrites
(b) bauxite
(c) galena
(d) cassiterite
Option b – bauxite
The manufacturing of iron from iron ore involves the process of
(a) oxidation
(b) reduction
(c) electrolysis
(d) fractional distillation
Option b – reduction
When metal is obtained in the molten state from its ore, the process may be called
(a) rusting
(b) smelting
(c) calcination
(d) thermal dissociation
Option b – smelting
Which of the following is not used for refining metals?
(a) Liquation
(b) Chromatographic methods
(c) Distillation
(d) Leaching
Option d – Leaching
Which one of the following elements forms the maximum number of compounds?
(a) Hydrogen
(b) Carbon
(c) Nitrogen
(d) Oxygen
Option b – Carbon
Buckminster fullerene is an allotrope of
(a) Boron
(b) Iron
(c) Phosphorus
(d) Carbon
Option d – Carbon
Which one of the following is not an allotrope of carbon?
(a) Soot
(b) Graphite
(c) Diamond
(d) Carborundum
Option d – Carborundum
Diamond is a
(a) good conductor and soft
(b) non-conductor and soft
(c) non-conductor and hard
(d) good conductor and hard
Option c – non-conductor and hard
Which one of the following is not true for diamonds?
(a) Each carbon atom is linked to four other carbon atoms.
(b) Three-dimensional network structure of carbon atoms is formed.
(c) It is used as an abrasive for sharpening hard tools.
(d) It can be used as a lubricant.
Option d – It can be used as a lubricant
Which among the following is an element?
(a) Alumina
(b) Brass
(c) Graphite
(d) Silica
Option c – Graphite
Which of the following is also used as a lubricant?
(a) Cuprite
(b) Graphite
(c) Haematite
(d) Cryolite
Option b – Graphite
Graphite is used in atomic piles
(a) as a lubricant.
(b) as a fuel.
(c) as an insulator.
(d) as a moderator.
Option d – as a moderator
Water softener is
(a) borax
(b) zeolite
(c) Both (a) and (b)
(d) None of these
Option c – Both (a) and (b)
Which one of the following is used for writing on glass?
(a) Silicon
(b) Graphite
(c) Hydrogen fluoride
(d) Hydrogen iodide
Option c – Hydrogen fluoride
Which of the following statement(s) is/are correct?
(a) Oxides of non-metals are basic.
(b) Oxides of non-metals are acidic.
(c) Oxides of metals are acidic.
(d) All options are correct.
Option b – Oxides of non-metals are acidic
Carbon monoxide is a poisonous gas. The antidote used for this poisoning is
(a) pure oxygen.
(b) carbonic acid.
(c) carborundum.
(d) carbogen.
Option d – carbogen
Which one of the following is water gas?
(a) Mixture of carbon monoxide and hydrogen.
(b) Mixture of carbon monoxide and nitrogen.
(c) Mixture of carbon dioxide and water vapor.
(d) Mixture of carbon monoxide and water vapor.
Option a – Mixture of carbon monoxide and hydrogen
Water gas is produced by
(a) passing steam over red-hot coke.
(b) passing steam and air over red-hot coke.
(c) burning coke in excess of air.
(d) burning coke in a limited supply of air.
Option a – passing steam over red-hot coke
Dihydrogen can be prepared on a commercial scale by the action of steam on hydrocarbons when a mixture of CO and H₂ gas is formed. It is known as
(a) water gas.
(b) producer gas.
(c) industrial gas.
(d) fuel gas.
Option a – water gas
Synthetic gas is a mixture of
(a) steam and carbon monoxide.
(b) carbon monoxide and nitrogen.
(c) hydrogen and methane.
(d) hydrogen and carbon monoxide.
Option d – hydrogen and carbon monoxide
Which one of the following gases dissolves in water to give an acidic solution?
(a) Carbon dioxide.
(b) Oxygen.
(c) Nitrogen.
(d) Hydrogen.
Option a – Carbon dioxide
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