In a coordination entity the central atoms or ions are referred to as:

Match List-I with List-II

List-I	List-II
(A) Acetone to secondary alcohol	(I) \(CrO _3\)
(B) Ethanol to Diethyl ether	(II) \(Zn\)
(C) Ethanol to ethanal	(III) \(NaBH _4\)
(D) Phenol to Benzene	(Iv) \(H _2 SO _4\) at 413 K

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Glucose on reaction with bromine water forms gluconic acid which confirms the presence of:

The strongest oxidising and reducing agents respectively are :

Match List-I With List-II

LISt – I (Solution)	LIST – II (Properties)
(A) Phenol and aniline	(I) Minimum boiling azeotrope
(B) Nitric acid and water	(II) Maximum boiling azeotrope
(C) Ethanol and water	(III) Hydrogen bonding
(D) Benzene and toluene	(IV) Ideal solution

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Isopropylbromide reacts with silver nitrite to form major product as

Ethanol cannot be prepared from :

Which of the following statements is not true?

If \(A\) and \(B\) are two invertible matrices, then which of the following statements are correct?
(A) \(\left|A^{-1}\right|=|A|^{-1}\)
(B) \(\operatorname{adj} A=|A| A^{-1}\)
(C) \((A B)^{-1}=A^{-1} B^{-1}\)
(D) \((A+B)^{-1}=A^{-1}+B^{-1}\)
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The threshold wavelength of silver is \( 3250 \times 10^{-10} \text{ m} \). The velocity of the electron ejected from the silver surface by ultra violet light of wavelength \( 2536 \times 10^{-10} \text{ m} \) is approximately : (Given \( h = 4.14 \times 10^{-15} \text{ eVs} \))

In water hyacinth, pollination is carried out by -
(A) Wind
(B) Water
(C) Insects
(D) Animals
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The forbidden energy gap for Si is

Answer the question on the basis of passage given below:
Second period elements of p-Block differs from the rest of their group members due to their small atomic size, high electronegativity, high ionization enthalpy and absence of d-orbitals. The elements from the second period like C, N, O have unique property of forming \(p \pi-p \pi\) multiple bonds whereas other heavier elements of p-block form \(d \pi-p \pi\) multiple bonds. This changes the properties of second period elements to great extent. Also the single bond strength of the p-block elements with their own atoms gets affected by their atomic size and presence of lone pairs.
Inert pair effect also affects the properties of the p-Block elements especially for those elements which are present from 4th period onward and this happens due to poor screening effect of inner (n-1)d subshell electrons.
Catenation tendency of Nitrogen is weaker than Phosphorus, because