Which one metal belongs to Alkaline earth metal?
(d)
Which one is Barium
(c)
Chlorine can be displaced by ______
(a)
Which one is strong acid?
(d)
Which Halogen exists in liquid state?
(c)
Non-metals of______ group are gases
(c)
Which one is Metalloid?
(c)
Which one of the following act as oxidizing agent?
(d)
Which gas can turn lime water milky?
(c)
Which compound is known as lunar caustic?
(b)
Which group of elements are known as Alkali Metals?
Answer: a) Group IA
Alkali metals belong to Group IA of the periodic table and include elements like Lithium (Li), Sodium (Na), and Potassium (K).
The most reactive metal is:
Answer: c) Cesium (Cs)
Cesium is the most reactive metal due to its large atomic size and low ionization energy, making it lose electrons most easily.
Which of the following is an Alkaline Earth Metal?
Answer: b) Magnesium (Mg)
Alkaline Earth Metals belong to Group IIA and include Beryllium (Be), Magnesium (Mg), Calcium (Ca), etc.
The lightest metal is:
Answer: a) Lithium (Li)
Lithium has the lowest density among metals, making it the lightest metal.
Which metal is kept in kerosene to prevent its reaction with moisture?
Answer: b) Sodium (Na)
Sodium reacts violently with water and moisture, so it's stored in kerosene to prevent accidental reactions.
The heaviest metal is:
Answer: b) Osmium (Os)
Osmium has the highest density among all metals, making it the heaviest.
Which of the following is a property of metals?
Answer: c) Ductile and malleable
Metals can be drawn into wires (ductile) and hammered into sheets (malleable) due to metallic bonding.
The most abundant metal in the Earth's crust is:
Answer: b) Aluminum (Al)
Which of the following is a noble metal?
Answer: c) Gold (Au)
Noble metals (like Gold, Silver, Platinum) resist oxidation and corrosion in moist air.
The flame color of Sodium (Na) is:
Answer: b) Golden Yellow
The only metal found in liquid state at room temperature is:
Answer: b) Mercury (Hg)
Which of the following is a non-metal?
Answer: c) Sulfur (S)
Sulfur is a yellow brittle solid that gains electrons in reactions, characteristic of non-metals.
The hardest non-metal is:
Answer: a) Diamond
The most electronegative element is:
Answer: b) Fluorine (F)
Fluorine has the highest electronegativity due to its small size and high nuclear charge.
Which of the following oxides is acidic?
Answer: c) CO₂
Non-metal oxides like CO₂ form acidic solutions (H₂CO₃) when dissolved in water.
The chemical formula of baking soda is:
Answer: c) NaHCO₃
Sodium bicarbonate (NaHCO₃) is commonly known as baking soda, used in cooking and as antacid.
Which of the following is used in street lights?
Answer: a) Sodium (Na)
Sodium vapor lamps produce characteristic yellow light and are energy-efficient for street lighting.
The flame color of Calcium (Ca) is:
Answer: b) Brick Red
Which of the following is used in nuclear reactors as a coolant?
Answer: a) Sodium (Na)
Liquid sodium is an excellent heat transfer fluid used in fast breeder nuclear reactors.
The compound used in water treatment to reduce acidity is:
Answer: b) Slaked Lime
Calcium hydroxide (slaked lime) neutralizes acidic water: Ca(OH)₂ + 2H⁺ → Ca²⁺ + 2H₂O.
Which of the following is used in photographic films?
Answer: b) AgBr
Silver bromide's light-sensitive properties make it ideal for photographic emulsions: 2AgBr → 2Ag + Br₂.
The metal used in cathodic protection is:
Answer: b) Magnesium (Mg)
Magnesium acts as sacrificial anode (more reactive) to protect iron structures from rusting.
Which of the following is a soft metal?
Answer: b) Sodium (Na)
Which of the following is a hard metal?
Answer: c) Tungsten (W)
Which of the following is used in dental fillings?
Answer: c) Mercury (Hg)
Amalgams (Hg-Ag-Sn alloys) are durable dental fillings that harden after placement.
The metal used in luminous paints is:
Answer: c) Barium (Ba)
Barium compounds (like BaSO₄) are phosphorescent and used in glow-in-the-dark paints.
Which of the following is used in flares and flashbulbs?
Answer: b) Magnesium (Mg)
Magnesium burns with intense white light (2800°C): 2Mg + O₂ → 2MgO + light.
The chemical formula of gypsum is:
Answer: c) 2CaSO₄·H₂O
Gypsum is calcium sulfate dihydrate, used in plaster and construction materials.
Which of the following is used in swimming pools for sterilization?
Answer: c) Calcium Hypochlorite
Ca(OCl)₂ releases chlorine which kills microorganisms: Ca(OCl)₂ + H₂O → Ca²⁺ + 2OCl⁻ + 2H⁺.
The metal used in mobile phones and laptops due to its light weight is:
Answer: b) Magnesium (Mg)
Magnesium alloys reduce device weight while maintaining structural integrity.
Which of the following is used in catalytic converters in vehicles?
Answer: c) Platinum (Pt)
Platinum converts harmful gases (CO, NOx) into CO₂ and N₂ through catalytic action.
Which of the following is a VIIA group element?
Answer: b) Fluorine (F)
Group VIIA contains halogens: F, Cl, Br, I, At - all highly reactive non-metals.
The strongest acid among the following is:
Answer: d) HI
Acid strength increases down the group: HI > HBr > HCl > HF due to decreasing bond energy.
Which of the following is used in artificial rain?
Answer: a) Silver Iodide (AgI)
AgI particles act as nucleation sites for ice crystal formation in cloud seeding.
The outer layer of teeth is composed of:
Answer: d) All of the above
Which of the following is used in toothpaste to prevent tooth decay?
Answer: b) Fluorine (F)
Fluoride ions (F⁻) replace OH⁻ in tooth enamel, forming more acid-resistant fluorapatite.
The color of Chlorine gas is:
Answer: b) Green
Chlorine gas has a pale yellow-green color due to its absorption spectrum.
Which of the following is a VIIIB group element?
Answer: a) Iron (Fe)
Group VIIIB contains iron (Fe), cobalt (Co), nickel (Ni) - transition metals with magnetic properties.
The chemical formula of slaked lime is:
Answer: b) Ca(OH)₂
Slaked lime forms when quicklime (CaO) reacts with water: CaO + H₂O → Ca(OH)₂.
The metal used in the helmet of astronauts is:
Answer: a) Gold (Au)
Gold coatings reflect infrared radiation while maintaining visibility in space helmets.
The most abundant element in the human body is:
Answer: b) Oxygen (O)
The most abundant element in the universe is:
Answer: c) Hydrogen (H)