Competition badha yaa ghata iss saal ?
Dkhlo ek baar
Dkhlo ek baar
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⭐️Names & Formulas of Elements
🔺 Common salt = NaCl
🔺Baking soda = NaHCO₃
🔺 Washing soda = Na₂CO₃
10H₂O
🔺Caustic Soda = NaOH
🔺Suhaga = Na₂B₄O₇ 10H₂O
🔺 Alum = K₂SO₄ Al₂(SO₄)₃
24H₂O
🔺Red medicine = KMnO₄
🔺 Caustic Potash = KOH
Saltpeter = KNO₃
🔺Bleaching powder =
Ca(OCl)Cl
🔺 lime water = Ca(OH)₂
🔺Gypsum = CaSO₄ 2H₂O
🔺 Plaster of Paris = CaSO₄
½H₂O
🔺Chalk = CaCO₃
🔺Limestone = CaCO₃
🔺 Marble = CaCO₃
🔺Nausadar = NH4Cl
🔺Laughing gas = N₂O
🔺 Litharge = PbO
🔺 Galena = PbS
🔺Red vermilion = Pb₃O₄
🔺White lead = 2PbCO₃ Pb(OH)₂
🔺 Salt acid = HCl
🔺Shore's acid = HNO₃
🔺Amalraj = HNO₃ + HCl (1 : 3)
🔺Dry ice = CO₂
🔺Green Case = FeSO₄ 7H₂O
🔺 Horn Silver = AgCl
🔺 Heavy water = D₂O
🔺Producer gas = CO + N₂
🔺Marsh gas = CH₄
🔺Vinegar = CH₃COOH
🔺Gemaxine = C₆H₆Cl₆
🔺Blue Case = CuSO₄ 5H₂O
🔺alcohol = C₂H₅OH
🔺 Mand = C₆H₁₀O₅
🔺Grape juice = C₆H₁₂O₆
🔺Sugar = C₁₂H₂₂O₁₁
🔺Urea = NH₂CONH₂
Benzene = C₆H₆
🔺 Common salt = NaCl
🔺Baking soda = NaHCO₃
🔺 Washing soda = Na₂CO₃
10H₂O
🔺Caustic Soda = NaOH
🔺Suhaga = Na₂B₄O₇ 10H₂O
🔺 Alum = K₂SO₄ Al₂(SO₄)₃
24H₂O
🔺Red medicine = KMnO₄
🔺 Caustic Potash = KOH
Saltpeter = KNO₃
🔺Bleaching powder =
Ca(OCl)Cl
🔺 lime water = Ca(OH)₂
🔺Gypsum = CaSO₄ 2H₂O
🔺 Plaster of Paris = CaSO₄
½H₂O
🔺Chalk = CaCO₃
🔺Limestone = CaCO₃
🔺 Marble = CaCO₃
🔺Nausadar = NH4Cl
🔺Laughing gas = N₂O
🔺 Litharge = PbO
🔺 Galena = PbS
🔺Red vermilion = Pb₃O₄
🔺White lead = 2PbCO₃ Pb(OH)₂
🔺 Salt acid = HCl
🔺Shore's acid = HNO₃
🔺Amalraj = HNO₃ + HCl (1 : 3)
🔺Dry ice = CO₂
🔺Green Case = FeSO₄ 7H₂O
🔺 Horn Silver = AgCl
🔺 Heavy water = D₂O
🔺Producer gas = CO + N₂
🔺Marsh gas = CH₄
🔺Vinegar = CH₃COOH
🔺Gemaxine = C₆H₆Cl₆
🔺Blue Case = CuSO₄ 5H₂O
🔺alcohol = C₂H₅OH
🔺 Mand = C₆H₁₀O₅
🔺Grape juice = C₆H₁₂O₆
🔺Sugar = C₁₂H₂₂O₁₁
🔺Urea = NH₂CONH₂
Benzene = C₆H₆
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✅General Science Most Important Question Part -1
1. फूलों का रंग कौन सी गैस उड़ा देती है
- क्लोरीन
2. कृत्रिम वर्षा के लिए प्रयोग किया जाता है
- सिल्वर आयोडाइड
3. पेंसिल का लेड किसका बना होता है
- ग्रेफाइट
4. आतिशबाजी में नीला रंग किस कारण होता है
- तांबा
5. आतिशबाजी में पीला रंग किस कारण होता है
- सोडियम
6. पाॅलीथीन बनाने में किसका प्रयोग होता है
- इथीलिन
7. Non-Sitck बर्तनों की ऊपरी परत किसकी बनी होती है
- टेफलाॅन
8. मूत्र का पीला रंग किसके कारण होता है
- यूरोक्रोम
9. सोडा वाटर बनाने में किसका प्रयोग होता है
- कार्बन डाइऑक्साइड गैस
10. किस गैस को ' मृदा गैस ' भी कहा जाता है
- जीनाॅन
1. फूलों का रंग कौन सी गैस उड़ा देती है
- क्लोरीन
2. कृत्रिम वर्षा के लिए प्रयोग किया जाता है
- सिल्वर आयोडाइड
3. पेंसिल का लेड किसका बना होता है
- ग्रेफाइट
4. आतिशबाजी में नीला रंग किस कारण होता है
- तांबा
5. आतिशबाजी में पीला रंग किस कारण होता है
- सोडियम
6. पाॅलीथीन बनाने में किसका प्रयोग होता है
- इथीलिन
7. Non-Sitck बर्तनों की ऊपरी परत किसकी बनी होती है
- टेफलाॅन
8. मूत्र का पीला रंग किसके कारण होता है
- यूरोक्रोम
9. सोडा वाटर बनाने में किसका प्रयोग होता है
- कार्बन डाइऑक्साइड गैस
10. किस गैस को ' मृदा गैस ' भी कहा जाता है
- जीनाॅन
👍10🙏2
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✅Notes on s-Block Elements:
Physical Properties of Alkali Metals:
➖These are soft in nature and can be cut with the help of knife except the lithium.
➖The atoms of alkali metals have the largest size in their respective periods.
➖The first ionization energy of the alkali metals are the lowest as compared to the elements in the other group.
➖The alkali metals show +1 oxidation state.
➖The alkali metals have low values of reduction potential (as shown in table-I) and therefore have a strong tendency to lose electrons and act as good reducing agents.
➖The melting and boiling points of alkali metals are very low because the intermetallic bonds in them are quite weak.
Hydroxides of Alkali Metals:
a)All the alkali metals, their oxides, peroxides and superoxides readily dissolve in water to produce corresponding hydroxides which are strong alkalies.
➖2Na + 2H2O → 2NaOH + H2
➖Na2O + 2H2O 2NaOH
➖Na2O2 + 2H2O → 2NaOH + H2O2
➖2KO2 + 2H2O → 2KOH + H2O2 + O2
b) The basic strength of these hydroxides increases as we move down the group Li to Cs.
c) All these hydroxides are highly soluble in water and thermally stable except lithium hydroxide.
d) Alkali metals hydroxides being strongly basic react with all acids forming salts.
➖NaOH + HCI → NacI + H2O
➖2NaOH + H2 SO4 → Na2SO4 + 2H2O
Halides of Alkali metals:
➖M2O + 2HX → 2MX + H2O
➖MOH + HX → MX + H2O
➖M2CO3 + 2HX → 2MX + CO2 + H2O (M = Li, Na, K, Rb or Cs)
(X = F, Cl, Br or I)
➖ll the alkali metals form ionic (electrovalent) compounds.
➖The alkali metals are good conductors of heat and electricity.
➖Alkali metals (except Li) exhibit photoelectric effect
➖The alkali metals and their salts impart a characteristic colour to flame.
Physical Properties of Alkali Metals:
➖These are soft in nature and can be cut with the help of knife except the lithium.
➖The atoms of alkali metals have the largest size in their respective periods.
➖The first ionization energy of the alkali metals are the lowest as compared to the elements in the other group.
➖The alkali metals show +1 oxidation state.
➖The alkali metals have low values of reduction potential (as shown in table-I) and therefore have a strong tendency to lose electrons and act as good reducing agents.
➖The melting and boiling points of alkali metals are very low because the intermetallic bonds in them are quite weak.
Hydroxides of Alkali Metals:
a)All the alkali metals, their oxides, peroxides and superoxides readily dissolve in water to produce corresponding hydroxides which are strong alkalies.
➖2Na + 2H2O → 2NaOH + H2
➖Na2O + 2H2O 2NaOH
➖Na2O2 + 2H2O → 2NaOH + H2O2
➖2KO2 + 2H2O → 2KOH + H2O2 + O2
b) The basic strength of these hydroxides increases as we move down the group Li to Cs.
c) All these hydroxides are highly soluble in water and thermally stable except lithium hydroxide.
d) Alkali metals hydroxides being strongly basic react with all acids forming salts.
➖NaOH + HCI → NacI + H2O
➖2NaOH + H2 SO4 → Na2SO4 + 2H2O
Halides of Alkali metals:
➖M2O + 2HX → 2MX + H2O
➖MOH + HX → MX + H2O
➖M2CO3 + 2HX → 2MX + CO2 + H2O (M = Li, Na, K, Rb or Cs)
(X = F, Cl, Br or I)
➖ll the alkali metals form ionic (electrovalent) compounds.
➖The alkali metals are good conductors of heat and electricity.
➖Alkali metals (except Li) exhibit photoelectric effect
➖The alkali metals and their salts impart a characteristic colour to flame.
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