Correct Answer : A
Explanation :
Explanation :
Salt lowers the freezing point of ice below zero degree.
Correct Answered :
Wrong Answered :
A
salt
B
urea
C
sand
D
oil
Salt lowers the freezing point of ice below zero degree.
Correct Answered :
Wrong Answered :
A
Sodium Hypochlorite
B
Calcium Carbonate
C
Sodium Benzoate
D
Sodium Bicarbonate
Sodium hypochlorite, commonly known as bleach, is most frequently used as a disinfecting agent. It is a broad-spectrum disinfectant that is effective for the disinfection of viruses, bacteria, fungi, and mycobacterium.
Correct Answered :
Wrong Answered :
A
Silver
B
Mercury
C
Copper
D
Zinc
Cyanide process, also called Macarthur-forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.
Correct Answered :
Wrong Answered :
A
Helium
B
Nitrogen
C
Argon
D
Neon
Noble gas means any of the gaseous elements which occupy Group 0(18) of the periodic table. They exhibit great stability and very low reaction rate. Complete step by step solution: Noble gases are generally inert gas that exhibit great stability and have generally full filled electronic configuration. They belong to group 18 of the periodic table. Group 18 of the periodic table includes He, Ne, Ar, Kr, Xe and Rn.
Correct Answered :
Wrong Answered :
A
Silver
B
Iron
C
Aluminum
D
Silicon
Silicon is, by far, the most common semiconductor material used in solar cells, representing approximately 95% of the modules sold today. It is also the second most abundant material on Earth (after oxygen) and the most common semiconductor used in computer chips.
Correct Answered :
Wrong Answered :
A
One atomic mass unit
B
Two atomic mass unit
C
Twelve atomic mass unit
D
sixteen atomic mass unit
The mass of 1 hydrogen atom is estimated to be equal to the mass of a proton, which is equal to 1 AMU (Atomic Mass Unit)
Correct Answered :
Wrong Answered :
A
Protons
B
Electrons
C
Neutrons
D
Nucleus
The mass of the atom is concentrated in the nucleus (protons and neutrons are about 2000 times as heavy as electrons)
Correct Answered :
Wrong Answered :
A
Alcohol and acid
B
acid and base
C
ketone and alcohol
D
alcohol and aldehyde
Esters are formed by the condensation reaction between an alcohol and a carboxylic acid. This is known as esterification.
Correct Answered :
Wrong Answered :
A
drying agent
B
hydrating agent
C
carboxylating agent
D
decarboxylating agent
The anhydrous calcium chloride will absorb any water (including condensation, vapour etc) in its environment. It effectively traps that water by changing its molecular make-up.
Correct Answered :
Wrong Answered :
A
Acetic Acid
B
Hydrochloric acid
C
Citric acid
D
Phosphoric acid
Vinegar is an aqueous solution of acetic acid and trace compounds that may include flavorings. Vinegar typically contains 5–8% acetic acid by volume.
Correct Answered :
Wrong Answered :
A
Gold
B
Silver
C
Copper
D
Glass
Relative to metals, glass is a poor conductor of heat. It is a better heat conductor than some other common building materials, such as wood.
Correct Answered :
Wrong Answered :
A
the petal gets discolourised
B
the colour of petal increases
C
there is no change in petal colour
D
the petal becomes a liquid
Sulphur dioxide is a good reducing agent, hence it can easily decolourise substances in the presence of water. Therefore, when rose petals are placed in a jar containing sulphur dioxide, they get decolourised.
Correct Answered :
Wrong Answered :
A
Sodium
B
Magnesium
C
Carbon
D
Nitrogen
Carbon exhibits the property of catenation due to strong C-C bond.
Correct Answered :
Wrong Answered :
A
Acetic Acid
B
Ethanol
C
Methanol
D
Glycol
Image result for Ethanoic acid is also called as Acetic acid (CH3COOH), also called ethanoic acid, the most important of the carboxylic acids.
Correct Answered :
Wrong Answered :
A
7.35 to 7.45
B
7.52 to 7.72
C
6.21 to 6.61
D
7.00 to 7.21
Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually the body maintains the pH of blood close to 7.40. A doctor evaluates a person`s acid-base balance by measuring the pH and levels of carbon dioxide (an acid) and bicarbonate (a base) in the blood.
Correct Answered :
Wrong Answered :
A
White flame
B
red flame
C
green flame
D
blue flame
When magnesium ribbon is burnt in the air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light. It forms a white powder of magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.
Correct Answered :
Wrong Answered :
A
Electrolysis
B
Hydrolysis
C
Carboxylation
D
Decarboxylation
Sodium is extracted from it`s ore by electrolysis of fused sodium chloride. The process is usually carried out ia a special electrochemical cell called the downs cell.
Correct Answered :
Wrong Answered :
A
Salicylic acid
B
Sulphuric Acid
C
Hydrochloric Acid
D
Acetic Acid
Aspirin is prepared by chemical synthesis from salicylic acid, through acetylation with acetic anhydride. The molecular weight of aspirin is 180.16g/mol. It is odourless, colourless to white crystals or crystalline powder.
Correct Answered :
Wrong Answered :
A
drops below 5
B
rises above 6
C
rises above 8
D
rises above 10
Tooth decay starts when the pH of the mouth is lower than 5.5. Using toothpastes, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.
Correct Answered :
Wrong Answered :
A
blue flame
B
green flame
C
yellow flame
D
no flame
Unsaturated carbon compounds on combustion give a yellow flame with lots of black soot. On combustion, saturated carbon compounds give a clean flame while unsaturated carbon compounds give a yellow flame with lots of black soot.
Correct Answered :
Wrong Answered :
A
Exothermic reactions
B
Endothermic reactions
C
Isothermic reactions
D
Photochemical reactions
A chemical reaction in which heat or energy is liberated is called an exothermic reaction.
Correct Answered :
Wrong Answered :
A
Molecular mass
B
Atomic number
C
Proton
D
Electron
The number of C atoms in homologous series increases gradually. Van der Waal`s force increases as the molecules get bigger. Hence, the melting and boiling points of the members of homologous series increase gradually because their molecular masses increase.
Correct Answered :
Wrong Answered :
A
mild base
B
mild acid
C
neutral solution
D
strong acid
To get rid of stomach pain, people use bases called antacids. These antacids neutralise the excess acid. Magnesium hydroxide (Milk of magnesia), a mild base, is often used for this purpose.
Correct Answered :
Wrong Answered :
A
Sodium
B
Magnesium
C
Gold
D
Silver
After Potassium, Sodium is the most reactive metal.
Correct Answered :
Wrong Answered :
A
Solid
B
Liquid
C
Gas
D
Plasma
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
Correct Answered :
Wrong Answered :
A
Calcium Carbonate
B
Sodium Carbonate
C
Potassium Carbonate
D
Zinc Carbonate
When carbon dioxide is passed through lime water, it turns milky due to formation of white precipitate in form of calcium carbonate.
Correct Answered :
Wrong Answered :
A
Ethane
B
Ethene
C
Propene
D
Alkene
Example of saturated carbon compound is Ethane (C2H6).
Correct Answered :
Wrong Answered :
A
Oxidation
B
Reduction
C
Substitution reaction
D
Combination reaction
Oxygen is eight times more soluble in fats than in water and it is the oxidation resulting from this exposure that is the primary cause of rancidity. Oxidation primarily occurs with unsaturated fats by a free radical-mediated process.
Correct Answered :
Wrong Answered :
A
CHO
B
COOH
C
COOR
D
CO
In Butanal, the functional group is −CHO. In Butanol, the functional group is −OH.
Correct Answered :
Wrong Answered :
A
Iron, Nickel and Chromium
B
Iron, Nickel and Magnesium
C
Iron, Bronze and Magnesium
D
Bronze, Magnesium and Nickel
Stainless steel alloys contain carbon, chromium, nickel, molybdenum, and manganese, phosphorus, sulfur, and silicon as trace elements.
Correct Answered :
Wrong Answered :
A
increases temperature of water
B
decreases temperature of water
C
no change in temperature
D
rapidly increases temperature and then decreases
If you add salt to water, you raise the water`s boiling point, or the temperature at which it will boil. The temperature needed to boil will increase about 0.5 C for every 58 grams of dissolved salt per kilogram of water.
Correct Answered :
Wrong Answered :
A
Red
B
Yellow
C
Orange
D
Pink
Methyl orange indicator gives red color in acid solution.
Correct Answered :
Wrong Answered :
A
Constant proportion
B
Conservation of mass
C
Disproportion
D
Invisible particles
The Law of Conservation of Mass dates from Antoine Lavoisier`s 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Correct Answered :
Wrong Answered :
A
Steel > Wood > Water
B
Steel > Water>Wood
C
Water > Wood >Steel
D
Water > Steel > Wood
Thermal conductivity is defined as the heat flow per unit time. Steel has a higher thermal conductivity than water and wood. [Thermal conductivity of steel = 50.2 w/mk Thermal conductivity of water = 0.6 w/mk Thermal conductivity of wood = 0.12 w/mk]
Correct Answered :
Wrong Answered :
A
Acid
B
Hydrocarbons
C
Aerosols
D
Water
C
Correct Answered :
Wrong Answered :
A
Organic compounds prepared by bacteria from atmospheric nitrogen.
B
Nitrous oxide through gaseous exchange from stomata of the plant
C
Nitric oxide through gaseous exchange from stomata of the plant
D
Nitrous oxide through roots of the plant
A
Correct Answered :
Wrong Answered :
A
Vitamin C
B
Vitamin B1
C
Vitamin B2
D
Vitamin B6
Vitamin C
Correct Answered :
Wrong Answered :
A
Non-Renewable
B
Conventional
C
Exhaustible
D
Non-Conventional
Non-Conventional
Correct Answered :
Wrong Answered :
A
In
B
Cu
C
Ir
D
Fe
A
Plasma
B
Gas
C
Liquid
D
Solid
Solid
Correct Answered :
Wrong Answered :
A
Mesosphere
B
Exosphere
C
Stratosphere
D
Troposphere
Troposphere
Correct Answered :
Wrong Answered :
A
Petroleum
B
Coal
C
Wood
D
Biofuel
The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour.
Correct Answered :
Wrong Answered :
A
Principal Quantum Number
B
Azimuthal Quantum Number
C
Magnetic Quantum Number
D
Spin Quantum Number
Magnetic Quantum Number
Correct Answered :
Wrong Answered :
A
South America
B
Africa
C
Antarctica
D
North America
Antarctica
Correct Answered :
Wrong Answered :
A
Pressure - Temperature
B
Temperature - Volume
C
Pressure - Volume
D
Volume - Number of Gas Particles
Temperature - Volume
Correct Answered :
Wrong Answered :
A
Luminous Intensity
B
Electric Current
C
Thermodynamic Temperature
D
Amount of Substance
Amount of Substance
Correct Answered :
Wrong Answered :
A
Graphite
B
Manganese
C
Gold
D
Mica
Manganese
Correct Answered :
Wrong Answered :
A
Solid
B
Fluid
C
Gas
D
Liquid
Solid
Correct Answered :
Wrong Answered :
A
Exosphere
B
Mesosphere
C
Troposphere
D
Stratosphere
Stratosphere
Correct Answered :
Wrong Answered :
A
Au
B
K
C
Ag
D
Pb
A
Pyridoxine
B
Ascorbic Acid
C
Riboflavin
D
Folic Acid
Folic Acid
Correct Answered :
Wrong Answered :
A
Amorphous Solid
B
Pseudo Solid
C
Super Cooled Liquid
D
Crystalline Solid
Crystalline Solid
Correct Answered :
Wrong Answered :
A
3
B
8
C
1
D
2
A
Solid
B
Gas
C
Liquid
D
Plasma
A
Leclanche cell
B
Nickel - Cadmium Battery
C
Dry Cell
D
Lithium Cell
Nickel - Cadmium Battery
Correct Answered :
Wrong Answered :
A
Avogadro Law
B
Gay Lussac`s Law
C
Charles Law
D
Boyle`s Law
Avogadro Law
Correct Answered :
Wrong Answered :
A
Au
B
Na
C
Pb
D
Ag
A
2
B
1
C
8
D
3
Helium is a noble monoatomic gas and does not combine with other elements so it is a monoatomic gas and the atomicity is one
Correct Answered :
Wrong Answered :
A
Bauxite
B
Manganese
C
Mica
D
Coal
Coal
Correct Answered :
Wrong Answered :
A
Detergent
B
Sodium Chloride
C
Kerosene oil
D
Phenyl
The surface tension of water is increased when salt is added to it. Although the strong interactions between sodium cations and partial negative oxygen, and chloride anions and partial positive hydrogens disrupt some hydrogen bonding between water molecules, they actually strengthen the surface tension of water.
Correct Answered :
Wrong Answered :
A
Salt
B
Urea
C
Boric Acid
D
Hydrogen Peroxide
Rock salt or halite is the form of sodium chloride. Brine is a solution of water and salt has a lower freezing point than pure water putting salt or saltwater on ice that is near 0oC will cause it to melt. It is called as de-icing done after snowstorm to improve traction.
Correct Answered :
Wrong Answered :
A
Crystallization of salt
B
Evaporation
C
Burning of coal
D
Melting of ice
Burning of coal is a chemical change. When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed.
Correct Answered :
Wrong Answered :
A
Monosodium glycinate
B
Monosodium glutamate
C
Monosodium glutamine
D
Monosulphur glycerol
Monosodium glutamate (MSG) is a flavor enhancer commonly added to Chinese food, canned vegetables, soups and processed meats.
Correct Answered :
Wrong Answered :
A
Complex nitrous gas
B
certified national gas
C
compressed natural gas
D
coal and nucleotide gas
compressed natural gas
Correct Answered :
Wrong Answered :
A
Baking Soda
B
Blue Vitriol
C
Bleaching Powder
D
Gypsum
Cupric sulfate, CuSO4, commonly known as blue vitriol, is the most important salt of copper.
Correct Answered :
Wrong Answered :
A
Ceramic
B
Air
C
Paper
D
Mercury
Superconductor material classes include chemical elements like mercury or lead, alloys such as niobium-titanium, germanium-niobium, and niobium nitride, or organic superconductors.
Correct Answered :
Wrong Answered :
A
Galvanisation
B
Halogenation
C
Polycondensation
D
None of these
Galvanizing is the process of applying zinc coating to a more noble metal (popularly steel or iron) to prevent corrosion (rusting). Hot-dip galvanization is the most well-known method in which the steel part is submerged in a bath of molten zinc.
Correct Answered :
Wrong Answered :
A
Sodium chloride
B
Calcium chloride
C
Calcium sulfate hemihydrate
D
None of these
Plaster of Paris is a fine white powder of calcium sulphate hemihydrate. The chemical formula of Plaster of Paris is CaSO4. 1/2H2O.
Correct Answered :
Wrong Answered :
A
Sodium
B
Nickel
C
Zinc
D
Phosphorus
Zinc is an essential trace element involved in the correct packing and storage of insulin. Total zinc content in the pancreatic β-cells is among the highest in the body and changes in the Zn(2+) levels have been found to be associated with diabetes.
Correct Answered :
Wrong Answered :
A
Methane
B
Methanol
C
Ether
D
Chloropicrin
Chloropicrin is a constituent of tear gas and is responsible for causing irritation.
Correct Answered :
Wrong Answered :
A
Only 1
B
Only 2
C
Both 1 and 2
D
None of these
Both 1 and 2
Correct Answered :
Wrong Answered :
A
Ethyl alcohol
B
Sodium Chloride
C
Glycerol
D
Oxalic Acid
glycerol, a clear, colourless, viscous, sweet-tasting liquid belonging to the alcohol family of organic compounds; molecular formula HOCH2CHOHCH2OH.
Correct Answered :
Wrong Answered :
A
Chlorine
B
Ozone
C
Mercury
D
Nitrogen
Chlorine and chloramine are the major disinfectants used in public water systems.
Correct Answered :
Wrong Answered :
A
Allotropes
B
Hydrocarbons
C
Photolysis
D
Amorphous
Hydrocarbons
Correct Answered :
Wrong Answered :
A
High pressure
B
Low pressure
C
Zero pressure
D
None of these
Correct Answered :
Wrong Answered :
A
Sucrose
B
Fructose
C
Glucose
D
Lactose
Glucose
Correct Answered :
Wrong Answered :
A
Iron
B
Calcium
C
Phosphorus
D
Potassium
Correct Answered :
Wrong Answered :
Choose the correct alternative that has the same relationship as the original pair has
Poles : Magnet :: ? : Battery
A
Tracks
B
Distance
C
Joule
D
Terminals
Terminals
Correct Answered :
Wrong Answered :
A
Evaporation
B
Precipitation
C
Sublimation
D
None of these
Correct Answered :
Wrong Answered :
A
Banglore
B
Ahmedabad
C
Pune
D
Noida
A
Freon
B
Carbon tetrachloride
C
Methylene chloride
D
Phosgene
Correct Answered :
Wrong Answered :
A
Sulphur Dioxide
B
Carbon Monoxide
C
Ozone
D
Nitrous Oxide
Correct Answered :
Wrong Answered :
A
Soot
B
Smog
C
Smoke
D
Ozone
The term black carbon is sometimes used as a synonym for both the elemental and graphitic component of soot.
Correct Answered :
Wrong Answered :
A
aerosol
B
intermolecular forces
C
allotrope
D
both aerosol and allotrope
Correct Answered :
Wrong Answered :
A
Crystallisation
B
Distillation
C
Steam distillation
D
Sublimation
Naphthalene, being a subliming solid, is purified by sublimation.
Correct Answered :
Wrong Answered :
A
Zinc, Sodium and Magnesium
B
Copper, Sodium and Potassium
C
Sodium, Potassium and Magnesium
D
Bronze, Magnesium and Sulphur
Correct Answered :
Wrong Answered :
A
Cadmium
B
Lead
C
Copper
D
None of these