CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

Antacids are the substances that neutralise stomach acidity. Excessive secretion of acid for digestion in our stomach is fatal and can cause many diseases. So to neutralise it we use antacids.One well known antacid is Milk of Magnesia chemically known as magnesium Hydroxide. Second Example is Andrews Antacid. This is a type of Neutralisation Reaction.

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Why phenols are more acidic in nature

Posted by Dancer Bk Kumawat 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Dancer Bk Kumawat 6 years, 8 months ago

Wrong answer

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Gaurav Seth 6 years, 8 months ago

Phenol is more acidic than alcohols due to stabilisation of phenoxide ion through resonance. Presence of electron withdrawing group increases the acidity of phenol by , stabilising phenoxide ion while presence of electron releasing group decreases the acidity of phenol by destabilising phenoxide ion.

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What is N-O bond order in N2O5,N204,N20

Posted by Masthanreddy Patreddy 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Kumar 6 years, 8 months ago

First,N2O...then N2O4...then N2O5

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What are monomers

Posted by Tarun Jakhar 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Uses of amorphous solid

Posted by Akshita Rawat 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Tarun Jakhar 6 years, 8 months ago

Amorphous solids are used in construction and plastic ware industry. Glass and plastics are used to make varieties of products. Silica is one of the products, which is used in creation of the solar panels that plays an important role in converting the sunlight into electricity.

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Calculate the bolining point elevation for a solution prepared by aciding 10 gm of cacl2 to 200g of water?

Posted by Pragyanjali Shrivas 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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Difference between solid,liquid,gas.

Posted by Shailja Nigam 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Tarun Jakhar 6 years, 8 months ago

Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

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How many moles and how many grams of NaCl are present in 250ml of 0.5M NaCl solution

Posted by Jatin Joshi 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Vidushi Shukla 6 years, 8 months ago

Use molarity formula ,i.e., M= no. of moles of solute/ Vol. of solution (in litre). 0.5 = n/0.250=> n=0.5*0.25 => n= 0.125 moles of NaCl. Now for grams of NaCl , n = wt in gram / molar mass. 0.125 = wt / 58 => wt = 7.250 grams.

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I am student of class 12 I want help that, I want to make a chemistry project file so, I dont know which topic i have to take So, i am request that please give me a topic and Pdf for topic

Posted by Prince Mundra 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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I am student of class 12

Posted by Prince Mundra 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Tarun Jakhar 6 years, 8 months ago

Then

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How many of you guys are starting their chapters from coordination compound i need some help ples answer .

Posted by Janvi Dubey 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Akash Choudhary Dav Gandhinagar 6 years, 8 months ago

No frm solution

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Calculate the molality and mole fraction of 2.5 of etanoic acid in 75 g of benzene

Posted by Raju Sekhow 6 years, 8 months ago

CBSE > Class 12 > Chemistry

0 answers

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Where is intext question

Posted by Satyam Patel 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Janvi Dubey 6 years, 8 months ago

The questioms that are based on text given in NCERT for gettting our concept clear for that parti. topic☺️

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Why dilute solutions are generally ideal

Posted by Vaibhav Shukla 6 years, 8 months ago

CBSE > Class 12 > Chemistry

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In the aqueous solution of sulfuric acid the mole fraction of water is 0.85. What is the molality of solution?

Posted by Harshil Sharma 6 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 8 months ago

Mole fraction of solution = solute + solvent = 1

Here, Mole fraction of water is 0.85 so mole fraction of sulphuric acid will be (1-0.85) = 0.15

Hence each mole of the solution, 0.15 mole of sulphuric acid is dissolved .

So mass of solvent (water) is ,

For 1 mole of water H2O = 18 gm

So, 0.85 mole of water = 18 x 0.85 = 15.3 gm =0.0153 Kg

Thus, Molality (m) = no. of moles of solute (Sulphuric acid)/ mass of solvent in Kg

Hence, Molality of the solution (m) = 0.15 / 0.0153 = 9.8 m (nearly equal to 10)

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Anti markoniv rule only hbr is used why

Posted by Divya Rawat 6 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Gaurav Seth 6 years, 8 months ago

In the presence of peroxides, the addition of HBr occurs by a free-radical mechanism and the orientation is anti-Markovnikov. This is true only for HBr.
Free radical addition of HF and HI has never been observed, even in the presence of peroxides, and of HCl only rarely.
In the rare cases where free-radical addition of HCl was noted, the orientation was still Markovnikov, because the more stable product was formed.
Free radical addition of HF, HI and HCl is energetically unfavourable.

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Mohammad Owais 6 years, 8 months ago

Bond dissosiation energy is lowest (One of the reasons)!!!

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Kyu bhaiyo chemistry ka first chapyer ht gya kya

Posted by Amal Sinha 6 years, 8 months ago

CBSE > Class 12 > Chemistry