Which of the following is the correct statement?
A. The solubility of gases in liquids increases with a decrease of pressure.
B. If the dissolution process is endothermic, the solubility should increase with a rise in temperature.
C. If the dissolution process is endothermic, the solubility should decrease with a rise in temperature.
D. If the dissolution process is exothermic, solubility will not change with a increase in temperature.
E. If the dissolution process is exothermic, solubility should increase with an increase in temperature.
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Chemical formula of laughing gas is:

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Carboxylic acids are the organic compounds which comprise of carboxyl functional group, -COOH. These are generally found in nature, some higher members are known as fatty acids as they occur in natural fats as esters of glycerol. They can be prepared from oxidation of alcohols and aldehydes, hydrolysis of nitriles and amides and Grignard reagents. They are stronger acids than simple phenols and alcohols. but weaker than mineral acids. Substituents affect the acidity of aliphatic and aromatic carboxylic acids. They undergo reactions involving cleavage of -OH and C-OH bond. Carboxylic acids having an alpha hydrogen get halogenated in the presence of red phosphorus to form alpha halo carboxylic acids. The reaction is known as Hell Volhard Zelinsky reaction. Besides these aromatic carboxylic acids undergo electrophilic substitution reactions. They are versatile and are employed in the manufacture of various useful compounds. For example, methanoic acid is used in rubber, textile, dyeing, leather and electroplating industries. Higher fatty acids are used in the manufacture of soaps and detergents. Esters of Benzoic acid are used in perfumery.
Which carboxylic acid will not undergo HVZ reaction?

When benzene diazonium chloride reacts with phenol, it results in the formation of an orange colored compound (X); and when benzene diazonium chloride reacts with aniline, it results in the formation of a yellow colored compound ( Y ).
What are \(X\) and \(Y\) ?

Arrange the following in increasing order of basic strength in aqueous solution :
(A) \(C _6 H _5 NH _2\)
(B) \(C _2 H _5 NH _2\)
(C) \(\left( C _2 H _5\right)_2 NH\)
(D) \(NH _3\)
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Correct order of intermolecular forces of attractions in the following solids is :
(A) NaCl
(B) \(I_2\)
(C) Ice
(D) Iron
(E) Rubber
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The correct statement (s) for cubic close packed (ccp) three dimensional structure are :
(A) The number of the neighbours of an atom present in the top most layer is 12.
(B) The efficiency of atom packing is \(74\%\).
(C) The number of octahedral and tetrahedral voids per atom are 1 & 2, respectively.
(D) The unit cell edge length is \(2\sqrt{2}\) times the radius of the atom.
(E) The metals like Be, Cd, Mg, Zn have cubic close packed (ccp) structure.
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Question based on following passage :
Adsorption is the process of attracting and retaining the adsorbate molecules on the surface of adsorbent. It is of two types i.e. Physisrption and chemisorption. To increase the rate of reaction, the substance called 'catalyst' is added. Promotors enhance the activity of catalyst while poison decrease the catalyst activity. Solutions may be true solution, suspension and colloids. Colloids are heterogenous but quite stable. On the basis of nature of interaction, colloids may be Lyophilic or Lyophobic. On the basis of type of dispersed phase particles, there may be multimolecular colloids, macromlecular colloids and associated colloids. The congulation of colloids may be done by boiling, dialysis or by mixing oppositely charged sols.
The substances which behave as normal electrolyte at low concentration but become colloids at higher concentration, are known as :

Arrange the following steps for working of a full wave rectifier in correct sequence

(A) During the negative half cycle, \( D_1 \) is reverse biased while \( D_2 \) is forward biased.
(B) During the positive half cycle, \( D_1 \) is forward biased while \( D_2 \) is reverse biased.
(C) A pulsating d. c. voltage is obtained across \( R_L \).
(D) a. c. input is given to the primary of a centre-tap transformer.
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If the mean of a binomial distribution is 12 and its standard deviation is 2 , then the number of trials is :

Arrange the following compounds in order of their increasing boiling points.
(A) Pentan-1-ol
(B) n-Butane
(C)PentanalChoose the correct answer from the options given below:

Arrange the following complexes in decreasing order of number of unpaired electrons on the metal ion
(A) \([Co(NH_{3})_{6}]^{3+}\)
(B) \([CoF_{6}]^{3-}\)
(C) \([FeF_{6}]^{3-}\)
(D) \([Fe(CN)_{6}]^{3-}\)
Choose the correct answer from the options given below:

\(\tan \left[\frac{1}{2} \cos ^{-1}\left(\frac{4}{5}\right)\right]=\)