Darpan Chemistry Class 12

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

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(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.

(d) power alcohol.

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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