✅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
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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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साल 2024 का पहला सूर्य ग्रहण हाल ही में कब लगा, जो भारत में दिखाई नहीं दिया ?
Anonymous Quiz
43%
8 अप्रैल
26%
9 अप्रैल
18%
10 अप्रैल
13%
11 अप्रैल
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Anonymous Quiz
22%
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23%
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चिन
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विश्व होम्योपैथी दिवस हर साल कब मनाया जाता है ?
Anonymous Quiz
18%
08 अप्रैल
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09 अप्रैल
38%
10 अप्रैल
19%
11 अप्रैल
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इसरो टीम को किस मिशन के लिए प्रतिष्ठित ‘जॉन एल. ‘जैक’ स्विगर्ट जूनियर’ पुरस्कार से सम्मानित किया गया ?
Anonymous Quiz
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MOST IMPORTANT
SUMMARY OF HUMAN BODY
1: Number of Bones *206*
2: Number of Muscles *639*
3: Number of Kidneys *2*
4: Number of Milk Teeth *20*
5: Number of Ribs *24 (12 pair)*
6: Number of Heart Chamber *4*
7: Largest artery *Aorta*
8: Normal blood pressure *120/80mmHg*
9: Ph of Blood *7.35-7.45
10: Number of vertebrae in the Spine *33*
11: Number of vertebrae in the Neck *7*
12: Number of Bones in Middle Ear *6*
13: Number of Bones in Face *14*
14: Number of Bones in Skull *22*
15: Number of Bones in Chest *25*
16: Number of Bones in Arms *6*
17: Number of Muscles in Human Arm *72*
18: Number of Pumps in Heart *2*
19: Largest Organ *Skin*
20: Largest gland *Liver*
21: Biggest cell *female Ovum*
22: Smallest cell *male Sperm*
23: Smallest Bone *Stapes*
24: First transplanted Organ *Heart*
25: Average length of Small Intestine *7m*
SUMMARY OF HUMAN BODY
1: Number of Bones *206*
2: Number of Muscles *639*
3: Number of Kidneys *2*
4: Number of Milk Teeth *20*
5: Number of Ribs *24 (12 pair)*
6: Number of Heart Chamber *4*
7: Largest artery *Aorta*
8: Normal blood pressure *120/80mmHg*
9: Ph of Blood *7.35-7.45
10: Number of vertebrae in the Spine *33*
11: Number of vertebrae in the Neck *7*
12: Number of Bones in Middle Ear *6*
13: Number of Bones in Face *14*
14: Number of Bones in Skull *22*
15: Number of Bones in Chest *25*
16: Number of Bones in Arms *6*
17: Number of Muscles in Human Arm *72*
18: Number of Pumps in Heart *2*
19: Largest Organ *Skin*
20: Largest gland *Liver*
21: Biggest cell *female Ovum*
22: Smallest cell *male Sperm*
23: Smallest Bone *Stapes*
24: First transplanted Organ *Heart*
25: Average length of Small Intestine *7m*
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Hi bacho your physics kaur ma'am this side .
I am suffering from typhoid jiske Karn mujhe aj ka yt class cancel krana pda . Fever high hai . Hoping to get well soon 😞😞
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I am suffering from typhoid jiske Karn mujhe aj ka yt class cancel krana pda . Fever high hai . Hoping to get well soon 😞😞
Please keep on studying and watch my old videos of rocket 🚀 revision for revising concepts and practice questions after revision 👍
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