Which among the following are coordination complexes?
(A) Mohr's salt
(B) Tetraamminediaquacobalt (II) ion
(C) Carnallite
(D) Potassium ferricyanide
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"Arrange the following in order of increasing boiling points
(A) 1,4-Dichlorobenzene
(B) 1,3-Dichlorobenzene
(C) 1,2-Dichlorobenzene
(D) Chlorobenzene
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Carbohydrates such as cane sugar, glucose, starch etc. belong to a class of naturally occurring organic compounds. Structurally these are polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis. Carbohydrates which are sweet in taste are called sugars. Theses sugars can be reducing or non-reducing. Monosaccharides cannot be hydrolyzed to simpler units whereas Oligosaccharides yield two to ten monosaccharide units on hydrolysis. Polysaccharides yield large number of monosaccharide units on hydrolysis. This class of biomolecules is essential for living systems as they serve as storage molecules in plants and animals. In addition, they provide raw materials for important industries like furniture, textiles, paper, lacquers and breweries. Two aldopentose form important constituents of nucleic acids. Carbohydrates are also called saccharides (Greek: sakcharon which means sugar). Sugar which is used in household and in milk also comes under this class of biomolecules.
Which of the following is incorrect for glucose?

In process of froth floatation, which is used for the removing gangue from sulphide ores. Depressant used is :

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Organic compounds containing carbon -oxygen double bonds ( \(C = O\) ) are called carbonyl compounds. These are highly polar molecules. Hence, their boiling points are higher than hydrocarbons and ethers. Aldehydes can be prepared from dehydrogenation or oxidation of alcohols and by reduction of acylhalides. Ketones are prepared by oxidation of secondary alcohols or by hydration of alkynes etc.
Aldehydes and ketones undergo nucleophilic addition reaction with the number of nucleophiles such as HCN, NaHSO3 ammonia derivatives. Carboxylic acids are prepared by the oxidation of primary alcohols, aldehydes and alkenes, by hydrolysis of nitriles. Carboxylic acids are more acidic than alcohols and phenols.

According to the electrochemical series, which of the following statements is incorrect?

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When a ligand is bound to a metal ion through a single donor atom, it is said to be a unidentate ligand but when it bind through two donor atoms, then it is said to be didentate ligand and when several donor atoms are present in a single ligand, it is said to be a polydentate ligand. When a dior polydentate ligand uses its two or more donor atoms simultaneously to bind a single metal ion, it is said to be a chelate ligand. The number of such ligating groups is called the denticity of the ligand. ligand which has two different donor atoms and either of the two ligetes in the complex is called ambidentate ligands. The number of ligand donor atoms to which the metal is directly bonded, is called coordination number of the metal ion in the complex. Complexes in which a metal is bound to only one kind of donor groups are known as homoleptic and in which a metal is bound to more than one kind of donor groups are known as heteroleptic complexes.
The coordination number of Co and Al in \(\left[ CoCl ( en )_2\right] Cl\) and \(K _2\left[ Al \left( C _2 O _4\right)_3\right]\), respectively, are

When benzene diazonium chloride is treated with halogen acid in the presence of copper powder, the reaction is referred to as

Thiosulphte \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) is oxidized to __________ in presence of permanganate ion.

In a plane electromagnetic wave, the electric field varies as \( E = 90 \sin(500x + 20 \times 10^{10}t) \text{ V/m} \). The expression for the magnetic field variation is :

Two sources of equal emf are connected in series. This combination is connected to an external resistance R.
The internal resistance of two sources are \( r_1 \) and \( r_2 \) (\( r_2 > r_1 \)).
If the potential difference across the source of internal resistance \( r_2 \) is zero, then R equals to:

Nucleosome is associated with__________ molecules of histones.

Which techniques are commonly used for early diagnosis of a disease.
(A) Serum analysis
(B) ELISA
(C) PCR
(D) Recombinant DNA technology
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