Darpan Chemistry Class 12. We covered all the Darpan Chemistry Class 12 in this post for free so that you can practice well for the exam.
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Darpan Chemistry Class 12 Objective for Students
With cold and dilute sodium hydroxide fluorine reacts to give
(A) NaF and OF2
(B) NaF + O
(C) O2 and O3
(D) NaF + O₂
Option a – NaF and OF2
Which oxidation state is not shown by chlorine?
(A) +7
(B) +3
(C) +8
(D) +4
Option a – +7
When Cl₂ gas is passed through hot and conc. solution of KOH, the following compound is formed.
(A) KCI
(B) KCIO3
(C) KCIO2
(D) KCIO4
Option b – KClO3
The correct order of thermal stability of hydrogen halide (H-X) is
(A) HI > HBr > HCI > HF
(B) HF > HCI > HBr > HI
(C) HCI > HF > HBr > HI
(D) HI > HCI > HF > HBr
Option b – HF > HCI > HBr > HI
Decreasing order of electron affinity of halogen is
(A) I>F> Cl > Br
(B) Br > Cl>F>I
(C) I> CI > F > Br
(D) CI> F > Br > I
Option d – CI> F > Br > I
The stability of interhalogen compounds follows the order
(A) IF3 > BrF3 > CIF3
(B) BrF3 > IF3 > CIF3
(C) CIF3 > BrF3 > IF3
(D) CIF3 > IF3 > BrF3
Option a – IF3 > BrF3 > CIF3
A piece of ice, 100 g in mass is kept at 0°C. The amount of heat it requires to melt at 0°C is (take latent heat of melting of ice to be 333.6 J/g):
(a) 750.6 J.
(b) 83.4 J.
(c) 33360 J.
(d) 3.336 J.
Option c – 33360 J
Which one of the following hormones is essential for the uptake of glucose by cells in the human body?
(a) GH.
(b) TSH.
(c) Insulin.
(d) Cortisol.
Option c – Insulin
Which one of the following statements is correct?
(a) The oxidation number for hydrogen is always zero.
(b) The oxidation number for hydrogen is always +1.
(c) The oxidation number for hydrogen is always -1.
(d) Hydrogen can have more than one oxidation number.
Option d – Hydrogen can have more than one oxidation number
Methyl Isocyanate gas, which was involved in the disaster in Bhopal in December 1984, was used in the Union Carbide factory for the production of:
(a) Dyes.
(b) Detergents.
(c) Explosives.
(d) Pesticides.
Option d – Pesticides
‘German silver’ is used to make decorative articles, coinage metal, ornaments, etc. The name is given because:
(a) It is an alloy of copper and contains silver as one of its components.
(b) Germans were the first to use silver.
(c) Its appearance is like silver.
(d) It is an alloy of silver.
Option c – Its appearance is like silver
The emulsion is known as a:
(a) Colloidal solution of substances having different physical states.
(b) True solution.
(c) Distillation mixture for making alcohols.
(d) Colloidal solution of two liquids.
Option d – Colloidal solution of two liquids
If one mixes up ashes with animal fat, the substance received in the crude form is called:
(a) Pheromone.
(b) Soap.
(c) Cement.
(d) Concrete.
Option b – Soap
There are six electrons, six protons, and six neutrons in an atom of an element. What is the atomic number of the element?
(a) 6.
(b) 12.
(c) 18.
(d) 24.
Option a – 6
Which one of the following organic substances is an insecticide?
(a) Lindane.
(b) Pyrene.
(c) Oil of Wintergreen.
(d) Chloroform.
Option a – Lindane
When kept in the air, which of the following elements glows in the dark?
(a) Platinum.
(b) Strontium.
(c) White phosphorus.
(d) Red phosphorus.
Option c – White phosphorus
Which of the following items is used in household wiring to prevent accidental fire in case of a short circuit?
(a) Insulated wire.
(b) Plastic switches.
(c) Non-metallic coatings on conducting wires.
(d) Electric fuse.
Option d – Electric fuse
The setting time of cement is lowered by adding:
(a) Oxides of aluminum.
(b) Gypsum.
(c) Oxides of magnesium.
(d) Silica.
Option b – Gypsum
The soft silvery metallic element that ionizes easily when heated or exposed to light and is present in atomic clocks is:
(a) Californium
(b) Cesium
(c) Calcium
(d) Cerium
Option b – Cesium
The green color seen in firework displays is due to the chloride salt of:
(a) Calcium
(b) Barium
(c) Sodium
(d) Strontium
Option b – Barium
Catalytic converters are generally made from:
(a) Hydrogen
(b) Carbon
(c) Transition metals
(d) Alkali metals
Option c – Transition metals
Burns caused by steam are much more severe than those caused by boiling water because:
(a) Steam pierces through the pores of the body quickly
(b) The temperature of steam is higher
(c) Steam is a gas that engulfs the body quickly
(d) Steam has latent heat
Option d – Steam has latent heat
The atomic theory of matter was first proposed by:
(a) John Dalton
(b) Rutherford
(c) J.J. Thomson
(d) Niels Bohr
Option a – John Dalton
Which one of the following minerals contains mostly silica?
(a) Mica
(b) Quartz
(c) Olivine
(d) Pyroxene
Option b – Quartz
Sodium metal should be stored in:
(a) Alcohol
(b) Kerosene oil
(c) Water
(d) Hydrochloric acid
Option b – Kerosene oil
Which of the following particles has the dual nature of particle-wave?
(a) Proton
(b) Meson
(c) Neutron
(d) Electron
Option d – Electron
Which among the following is the sweetest sugar?
(a) Lactose
(b) Maltose
(c) Glucose
(d) Fructose
Option d – Fructose
Muddy water is treated with alum in the purification process, it is termed:
(a) Adsorption
(b) Coagulation
(c) Emulsification
(d) Absorption
Option b – Coagulation
Ultra-purification of a metal is done by:
(a) Smelting
(b) Leaching
(c) Zone melting
(d) Slagging
Option c – Zone melting
Which one of the following statements is correct?
(a) Rutherford’s alpha-particle scattering experiment led to the discovery of the electron.
(b) J.J. Thomson suggested that the nucleus of an atom contains protons.
(c) The atomic number of an element is the same as the number of protons in the nucleus of its atom.
(d) The mass number of an atom is equal to the number of electrons in its shells.
Option c – The atomic number of an element is the same as the number of protons in the nucleus of its atom
Which one of the following statements is not correct?
(a) The application of lime makes the soil acidic.
(b) High acidity in soil is typical of a humid climate.
(c) Increasing soil acidity results in declining soil fertility.
(d) Arid climate is characterized by alkaline soil.
Option a – The application of lime makes the soil acidic
The alkali metals have relatively low melting points. Which one of the following alkali metals is expected to have the highest melting point?
(a) Li
(b) Na
(c) K
(d) Rb
Option a – Li
The absolute zero, i.e., the temperature below which is not achievable, is about:
(a) 0°C
(b) -273 K
(c) -273°C
(d) -300°C
Option c – -273°C
Addition of gypsum to cement:
(a) Reduces the setting time of cement
(b) Produces a very light-colored cement
(c) Increases the setting time of cement
(d) Forms a shining surface
Option a – Reduces the setting time of cement
To weld metals together, a high temperature is 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 cleaning action of soap and detergent in water is due to the formation of:
(a) Micelle
(b) Salt
(c) Base
(d) Acid
Option a – Micelle
Which one among the following does not wet the walls of the glass vessel in which it is kept?
(a) Water
(b) Alcohol
(c) Mercury
(d) Phenol
Option c – Mercury
Which method of water purification does not kill microorganisms?
(a) Boiling
(b) Filtration
(c) Chlorination
(d) UV-irradiation
Option b – Filtration
Which one of the following gases is a supporter of combustion?
(a) Hydrogen
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
Option d – Oxygen
Which one of the following is not an explosive material?
(a) Trinitrotoluene
(b) Dinitro glycerine
(c) Cyclo Trimethylene trinitrarmine
(d) Nitrochloroform
Option d – Nitrochloroform
The date of manufacture of food items fried in oil should be checked before buying because oils become rancid due to:
(a) Oxidation
(b) Reduction
(c) Hydrogenation
(d) Decrease in viscosity
Option a – Oxidation
Which of the following are the two main constituents of granite?
(a) Iron and silica
(b) Iron and silver
(c) Silica and aluminum
(d) Iron oxide and potassium
Option a – Iron and silica
Iron sheet kept in moist air gets covered with rust. Rust is:
(a) An element
(b) A compound
(c) A mixture of iron and dust
(d) A mixture of iron, oxygen, and water
Option d – A mixture of iron, oxygen, and water
The branch of medicine involving synthetic chemical compounds is:
(a) Unani
(b) Ayurveda
(c) Allopathy
(d) Homeopathy
Option c – Allopathy
The metal used for making aircraft and rockets is:
(a) Lead
(b) Aluminium
(c) Nickel
(d) Copper
Option b – Aluminium
In the periodic table of elements, on moving from left to right across a period, the atomic radius:
(a) Decreases
(b) Increases
(c) Remains unchanged
(d) Does not follow a definite pattern
Option a – Decreases
Vulcanized rubber contains sulfur:
(a) 2%
(b) 3-5%
(c) 7-9%
(d) 10-15%
Option b – 3-5%
The percentage of carbon in cast iron:
(a) 0.01 to 0.25
(b) 0.5 to 1.5
(c) 6 to 8
(d) 3 to 5
Option d – 3 to 5
The pair of compounds used as an anesthetic in medicines:
(a) Ether, Ammonia
(b) Nitrous oxide, Chloroform
(c) Chloroform, Nitrogen dioxide
(d) Nitrogen dioxide, Ether
Option b – Nitrous oxide, Chloroform
The first stable product of photosynthesis:
(a) Starch
(b) Sucrose
(c) Phosphoglyceric acid
(d) Glucose
Option c – Phosphoglyceric acid
pH scale ranges:
(a) 0-7
(b) 8-14
(c) 0-14
(d) None
Option c – 0-14
A real gas can act as an ideal gas:
(a) High pressure and low temperature
(b) Low-pressure and high-temperature
(c) High pressure and high temperature
(d) Low pressure and low temperature
Option b – Low-pressure and high-temperature
Iron rusts quickly in:
(a) Rainwater
(b) Seawater
(c) Distilled water
(d) River water
Option b – Seawater
The iodine test is used to detect:
(a) Cholesterol
(b) Carbohydrate
(c) Protein
(d) Fat
Option b – Carbohydrate
Which of the following is used in pencils:
(a) Charcoal
(b) Graphite
(c) Lead
(d) Phosphorus
Option b – Graphite
The arsenic problem in India is primarily due to:
(a) Overexploitation of surface water in the affected areas
(b) Overexploitation of arsenopyrite in the hinterland
(c) Overexploitation of coal in Bihar and Bengal
(d) Overexploitation of groundwater in the affected areas
Option d – Overexploitation of groundwater in the affected areas
The most of the mass of the atom can be found in:
(a) Electrons
(b) Charges
(c) Nucleus
(d) Electron cloud
Option c – Nucleus
Which of the following acids is a mineral acid?
(a) Citric acid
(b) Hydrochloric acid
(c) Ascorbic acid
(d) Tartaric acid
Option b – Hydrochloric acid
The most stable form of carbon is:
(a) Diamond
(b) Graphite
(c) Fullerene
(d) Coal
Option b – Graphite
On heating, Gypsum loses a certain percentage of its water content and becomes:
(a) Plaster of Paris
(b) A pearl
(c) Chalk
(d) Calcium sulfate
Option a – Plaster of Paris
Cathode rays when obstructed by metal cause the emission of:
(a) Alpha-rays
(b) Beta-rays
(c) Gamma-rays
(d) X-rays
Option b – Beta-rays
Anomalous expansion is associated with:
(a) Alcohol
(b) Mercury
(c) Water
(d) Benzene
Option c – Water
The citrus fruits and pickles are not stored in which of the following containers?
(a) Iron
(b) Plastic
(c) Glass
(d) China clay
Option a – Iron
A thick paste of cement, sand, and water is called:
(a) Concrete
(b) R.C.C.
(c) Mortar
(d) Kiln
Option c – Mortar
Good conductors have many loosely bound:
(a) Atoms
(b) Electrons
(c) Protons
(d) Neutrons
Option b – Electrons
Radioactive materials should be kept in a container made of:
(a) Pb
(b) Steel
(c) Fe
(d) Al
Option a – Pb
Consider the following statements. I. Dynamite is prepared by mixing nitroglycerine with sawdust and ammonium nitrate. II. Liquor poisoning is due to the presence of methyl alcohol. III. Ethanol is generally present in tonics. Which of the above is correct?
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
Option d – I, II and III
The substance employed for food processing is
(a) sodium carbonate
(b) acetylene
(c) sodium nitrate
(d) benzoic acid
Option d – benzoic acid
Which of the following compounds does not contain a carboxylic acid group?
(a) Picric acid
(b) Vinegar
(c) Salicylic acid
(d) Benzoic acid
Option a – Picric acid
Which is a tribasic acid?
(a) Succinic acid
(b) Lactic acid
(c) Citric acid
(d) Valeric acid
Option c – Citric acid
Which of the following is the major component of vinegar?
(a) Nitric acid
(b) Lactic acid
(c) Citric acid
(d) Acetic acid
Option d – Acetic acid
Which of the following acid found in Apples?
(a) Malic acid
(b) Nitric acid
(c) Formic acid
(d) Sulphuric acid
Option a – Malic acid
………. is the primary acid present in ripe bananas.
(a) Formic acid
(b) Sulphuric acid
(c) Malic acid
(d) Hydrochloric acid
Option c – Malic acid
Muscle fatigue appears due to the accumulation of which of the following?
(a) Pyruvic acid
(b) Lactic acid
(c) Oxid acetic acid
(d) Uric acid
Option b – Lactic acid
Which of the following acids is present in ant bites?
(a) Formic acid
(b) Malic acid
(c) Perchloric acid
(d) Nitric acid
Option a – Formic acid
Which of the following acid is utilized in the photography?
(a) Formic acid
(b) Oxalic acid
(c) Citric acid
(d) Acetic acid
Option b – Oxalic acid
What is the dominant chemical present in vinegar?
(a) Malic acid
(b) Formic acid
(c) Sulphuric acid
(d) Ethanoic acid
Option d – Ethanoic acid
Methylated spirit is
(a) 100% alcohol.
(b) 95.6% alcohol + 4.4% water.
(c) 90% alcohol + 9% methanol + pyridine.
Option c – 90% alcohol + 9% methanol + pyridine
Traditional battery’ contains which of the following chemicals?
(a) Ethylene glycol
(b) Sulphuric acid
(c) Sodium bicarbonate
(d) Ethanol
Option b – Sulphuric acid
Synthetic ethanol is produced by reacting ethene (in the presence of phosphoric acid) with
(a) hydrogen
(b) potassium dichromate
(c) oxygen
(d) water (steam)
Option d – water (steam)
Ethyl alcohol is commonly made unfit for drinking by the addition of
(a) potassium cyanide
(b) methyl alcohol
(c) chloroform
(d) potassium chloride
Option b – methyl alcohol
Consider the following statements about nitrobenzene. I. Nitrobenzene is highly toxic and readily absorbed through the skin. II. Nitrobenzene is consumed in the production of aniline. III. It is also used in shoe and floor polishes. Which of the statements given above is correct?
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
Option d – I, II and III
Consider the following statements. I. Methyl alcohol is also called wood spirit because, in the early stage, it was prepared by the destructive distillation of wood. II. Ethyl alcohol is also called grain alcohol because it is obtained from a starch-enriched substance. III. Rectified spirit is also called commercial alcohol. Which of the statements given above is correct?
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
Option d – I, II and III
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