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    • Posted by O Singh 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aditya Vyas 7 years, 3 months ago

    As we know tollen test re given by aldehydes only but providing a high temp. and pressure ketones also gives this test so in formic acid H -(CHO) CHO group is present so it gets oxidised to co2 and h2o

    1Thank You

    Anurag Singh 7 years, 3 months ago

    Due to the apperance of CHO grp in formic acid H-(CHO) And this grp is absent in acetic acid

    1Thank You

    ANSWER

    • Posted by ????? ???? 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    ????? ???? 7 years, 3 months ago

    In which app I can see latest sample paper

    0Thank You

    Nitika Neb 7 years, 3 months ago

    You can check the latest sample paper in this app

    1Thank You

    Ritwik Raj Nirale 7 years, 3 months ago

    Kolbe reaction ,

    2Thank You

    ANSWER

    • Posted by Mahima Singh 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Rheiya Manhas 7 years, 3 months ago

    1. By incraesing the number of moles of hydrogen and nitrogen 2. High pressure 3. Low temperature

    0Thank You

    ANSWER

    • Posted by Shweta Arya 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Deepak Sharma 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by P S 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Manish Kumar Khokhar 7 years, 3 months ago

    because in tertiary amines N do no have protons/hydrogen

    1Thank You

    O Singh 7 years, 3 months ago

    Due to absence of H in N

    2Thank You

    ANSWER

    • Posted by Raghav Bansal 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Ayush Gupta 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Hitesh Rao 7 years, 3 months ago

    It is an additive which increases boiling point of it

    0Thank You

    Àñshul Shärmã 7 years, 3 months ago

    Antifreeze is an additive which lowers the freezing point of water based liquid and increase its boiling point

    1Thank You

    ANSWER

    • Posted by Shubhdeep Kaur Sandhy 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Àñshul Shärmã 7 years, 3 months ago

    It is a form of magnetism where by certain materials are weakly attracted by externally applied magnetic field

    1Thank You

    Amandeep Kumar 7 years, 3 months ago

    Whose magnetic supsebility is negative number

    0Thank You

    ANSWER

    • Posted by Kashish Rajput 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Gud Luck ? 7 years, 3 months ago

    -4 and -0.886

    1Thank You

    ANSWER

    • Posted by Gud Luck ? 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years, 3 months ago

    When dialysis is prolonged the traces of electrolyte which stabilies the colloids are removed completely. This makes the colloid unstable and therefore coagulation takes place. To increase the stability of colloids a small amount of electrolyte is added. on persistent dialysis the electrolyte is almost removed.so the colloidal sol will coagulate.

    4Thank You

    ANSWER

    • Posted by Gud Luck ? 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Pratishtha Mohan 7 years, 3 months ago

    In sn1 rxn a carbocation is formed which can be attacked from both the sides and retention as well as inversion both takes place resulting in racemisation

    1Thank You

    Gud Luck ? 7 years, 3 months ago

    Plzz answer fast

    0Thank You

    ANSWER

    • Posted by P S 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years, 3 months ago

    Adding ethylene glycol to water reduces the freezing point of water. Water freezes at temperatures much less than 0 degree Celsius when ethylene glycol is added to it. It is used as an anti-freeze. This practice was mostly practiced in older radiators in cold weather conditions.

    0Thank You

    ANSWER

    • Posted by Gangeshver Sharma 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Senjana Thakur 7 years, 3 months ago

    Permanganate requires low pH, or presence of strong acid. Best results can be obtained when permanganate is used for titration in combination with sulfuric acid. In the hydrochloric acid permanganate can be able to oxidize chlorides to chlorine, which can be a source of positive errors

    1Thank You

    ANSWER

    • Posted by Prisha K 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Kiran Kumari 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aryan Rai 7 years, 3 months ago

    Mine suggestion is OSWAAL SOLVED PAPERS. It is very much helpful as there are description chapterwise and then there is toppers answer too and solution of previous year questions are also given.

    1Thank You

    Prisha K 7 years, 3 months ago

    Try oswal books for chemistry..it consist of sample papers and board questions with answer written by toppers of cbse moreover it has breif notes and important questions with answers or if u dont want to study for any book I prefer you to study notes from text book and question answers for intext and exercise for help you can just buy a full marks guide..all the best..! :)

    2Thank You

    ANSWER

    • Posted by Stuti Mehra 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Prisha K 7 years, 3 months ago

    It is a for the concentration of sulphide ores.In this process we use powderd suplhide ores and to it we add froth stabalizers(aniline) and collector(pine oil or xanthates).The principle behind this process is the collectors increases the non wetability factor of ores and gaunge particles get wet by water. A paddle connected to it draws aor in the froth and aggitates the mixture such that the froth comes up and skimmed out whereas gaunge particles settles down in the water. You can also give example which is given in the textbook last paragraph of froth flotation topic(ZnS and PbS). :)

    1Thank You

    Bedisha Chettri 7 years, 3 months ago

    it is process which is used to purifie the impurites of ...metal

    1Thank You

    ANSWER

    • Posted by Vinay Kumar 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Hemanpreet Kaur 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Bedisha Chettri 7 years, 3 months ago

    narcotic medicine

    0Thank You

    ANSWER

    • Posted by Hemanpreet Kaur 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Aadil Saifi 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Ritu Bishnoi 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Kartik Mukherjee 7 years, 3 months ago

    Because the hve fully filled d orbita as the hve no unpaired electron.Hence, they do not hive colour too

    3Thank You

    Ritu Bishnoi 7 years, 3 months ago

    Can you tell me more reasons in detail...

    1Thank You

    Usha Singh 7 years, 3 months ago

    Because of. Fully filled D orbital

    1Thank You

    ANSWER

    • Posted by Harsh Sharma 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Deepak Sharma 7 years, 3 months ago

    add LiAlH4 ( lithium aluminium hydride ) to cyanobenzene , u will get 1-phenylmethanamine.

    1Thank You

    ANSWER

    • Posted by Keshav Pal Singh 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Parag Mittal 7 years, 3 months ago

    Voids

    2Thank You

    ANSWER

    • Posted by Rajesh Kumar 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years, 3 months ago

    The group 15 elements (nitrogen, phosphorus,arsenic,antimony and bismuth) when reacted with halogen atom ,tend to form halides. The halides formed are of two types:
    1) Trihalides (MX3)
    2) Pentahalides (MX5) where M -15TH group element X- halogen atom
    The trihalides are formed by all the elements of group 15 while pentahalides are formed by all the elements except nitrogen because there is absence of vacant d- orbital in its outermost shell.
    The oxidation state of +5 in pentahalides is more as compared to +3 oxidation state in trihalides. Due to the higher positive oxidation state of central atom in pentahalide state, these atoms will have larger polarizing power than the halogen atom attached to them. The central atom in pentahalide state will tend to polarize more the halide ion to which it is attached.
    But In case of trihalides due to +3 oxidation state the central atom will polarize the halogen atom to a lesser extent as compared to pentahalide state. Therefore, more the polarization, larger will be the covalent character of the bond.
    Hence due larger polarization of bond in pentahalide state as compared to trihalide state, the pentahalides are more covalent than trihalides.

    4Thank You

    ANSWER

    • Posted by Shiva Singh 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years, 3 months ago

    Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol whichshould be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf forwater = 1.86 K kg /mol , and molar mass of ethylene glycol= 62 g/mol

    1Thank You

    ANSWER

    • Posted by Mimansha Rajguru 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Ravi Sharma 7 years, 3 months ago

    Depression in boiling point when molality is unity

    0Thank You

    ANSWER

    • Posted by Vidisha Yadav 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Nitika Neb 7 years, 3 months ago

    a disinfectant is a chemical substance which is used to inhibit the growth of microorganisms and may even kill them they are not used for human skin they are used to clean the floor toilets extra example 1% phenol

    1Thank You

    ANSWER

    • Posted by Anand Ranjan 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Lehar Sharma 7 years, 3 months ago

    Anand all topics covered in ncert are in syllabus .. for preparing for boards donot follow any other book except ncert .. ?All the best

    1Thank You

    ANSWER

    • Posted by Rajat Turan 7 years, 3 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years, 3 months ago

    Condensation is the change of physical state of matter from gaseous phase into liquid phase. It is a process in which water vapor (gaseous form) in the air changes into liquid water when it touches a cooler surface. When water in the air comes in contact with a cold surface, it condenses to form water droplets. This phenomenon is known as condensation. The reverse of condensation is evaporation.

    1Thank You

    ANSWER

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