Practice free Aldehyde ketones & carboxylic Acid (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The product oblained by heating $ (NH_4 ) SO_4 and KCNO $ is
$ (NH_4)2SO_4 + KCNO \rightarrow NH_4CNO + K_2SO_4 \rightarrow NH_2CONH_2 urea $
$ H_2SO_4 reacts with PCl_5 $ to give
$ HO - SO_2 - OH + PCl_5 \rightarrow Cl - SO_2 - OH + POCl_3 + HCl $ $ HO - SO_2 - OH + 2PCl_5 \rightarrow Cl - SO_2 - Cl + 2POCl_3 + 2HCl $
The formula representing a simple ratio of atoms of different elements present in a molecule of the substance is called
The empirical formula represents the simplest whole-number ratio of atoms of different elements in a molecule. For example, the empirical formula of hydrogen peroxide (Hâ‚‚Oâ‚‚) is HO, which indicates the simplest ratio of hydrogen to oxygen is 1:1.
Empirical formula of a compound is $ CH_2O $ and its vapour density is 30. What is the molecular formula of compound ?
An organic compound contains C = 36%, H = 6%. What is the empirical formula of compound ?
An organic compound on analysis gave C = 48gm, H = 8gm and N = 56gm. Volume of 1.0 gm of the compound was found to be 200 ml at STP. What is the molecular formula of the compound ?
200ml of compound = 1 gm $ \therefore $ 22400 ml of compound = 112 gm
Which of the following is the method of estimating nitrogen in organic Compound ?
Both the Dumas and Kjeldahl methods are used for estimating nitrogen in organic compounds. The Dumas method involves combustion of the compound and measuring the nitrogen gas released, while the Kjeldahl method involves digestion of the compound with a strong acid and measuring the ammonia produced.
The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is
(d) Steam distillation is used to purify the substances which
(i) are volatile in steam but are immiscible with water.
(ii) possess sufficiently high vapour pressure at the boiling point of water.
(iii) contain non- volatile impurities.
The process of steam distillation can also be used to separate a mixture of two organic compounds one of which is steam volatile while the other is not. In ortho and para-nitrophenols, the latter is non-volatile, hence they are separated by steam distillation.
Tellurium hydride on dissolution in water gives:
The element is insoluble in water, but dissolves in concentrated sulphuric acid forming a deep red solution. Like sulphur and selenium, tellurium combines directly with hydrogen to form telluretted hydrogen, TeH2, an extremely objectionable smelling and highly poisonous gas, which was first prepared by ELEMENTAL H
Para- hydrogen at room temp is:
Ortho-hydrogen molecules are those in which the spins of both the nuclei are in the same direction. Para-hydrogen is when the spins of both the nuclei are in the opposite directions.
Ordinary hydrogen gas is an equilibrium mixture of ortho and para hydrogen. The amount of ortho- and para-hydrogen varies with temperature.
At 0°K, hydrogen contains mainly para-hydrogen which is more stable. At the temperature of liquid of air, the ratio of ortho- and para-hydrogen is 1 : 1.
At the room temperature, the ratio of ortho- to para-hydrogen is at its maximum of 3 : 1. Even at very high temperatures, the ratio of ortho- to para-hydrogen can never be more than 3 : 1. So, it is possible to get pure para hydrogen by cooling ordinary hydrogen gas to a very low temperature (close to 20 K) but it is never possible to get a sample of hydrogen containing more than 75% of ortho hydrogen.
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