The geometry and magnetic property of the complex \([Ni(CO)_4]\) is :

Consider the following statements about the physical and chemical characteristics of interstitial compounds and identify the correct statements
(A) They have high melting points.
(B) They are very hard.
(C) They retain metallic conductivity.
(D) They are chemically very reactive.
Choose the correct answer from the options given below:

False statement about Frenkel defect is:

Osmotic pressure measurements are less accurate and difficult to carry out. Therefore, this method is not useful for measuring molecular weights. But it is used to find out molecular weights of polymers eg. plastics, proteins and starch having many monomer units. Knowing the value of osmotic pressure of a given solution, molecular weight of the solute can be calculated using Van't Hoff equation.
An aqueous solution of salt contains 20 g of NaCl per liter. The pressure of solution at 35 \(^{\circ}\text{C}\) will be:

The correct structure of the dipeptide Gly-Ala (glycyl alanine) is:

Read the passage carefully and answer the questions
The carbonyl group of aldehydes and ketones is highly polar. The positively charged carbon is readily attacked by electron-rich nucleophile and the negatively charged oxygen atom is attacked by an electro-deficient electrophile. Aldehydes and ketones undergo nucleophilic addition reactions in the presence of acid or a base. The mechanism involves attack of a nucleophile on the electron deficient carbonyl carbon to form a tetrahedral intermediate. A new bond is formed between the carbon and oxygen. Protonation of the anion furnished by the reaction medium yields a neutral addition product. The addition product is same whether the reaction is catalyzed by acid or a base. For example in the presence of base aldehydes and ketones react with hydrogen cyanide to form cyanohydrin.
During nucleophilic addition reaction the carbonyl carbon undergoes a change in hybridization from:

Complete the following analogy: \(S _{ N } 2\) : Inversion of configuration; \(S _{ N } 1\) :______________?

The probability that a plant \(A\) survives is \(\frac{3}{4}\) and the probability that another plant \(B\) survives is \(\frac{1}{3}\).
The probability that only one of them survives is :

The cutting of DNA at specific locations is done with help of:

The molar conductivity of KNO\(_3\), NaCl and KCl are 111, 128 and 152 S cm\(^2\) mol\(^-\)\(\mathrm{^1}\), respectively. The molar conductivity of NaNO\(_3\) will be:

Two identical metal balls, A and B, with similar charges Q are suspended with insulating threads. They repel each other with a force F. Another identical uncharged metal ball C is first touched with metal ball A and then touched with metal ball B and finally removed. The new force of repulsion between A and B will be

In an LPP, the feasible region represented by the set off constraints \(2 x+3 y \leq 18, x+y \leq 10, x \geq 0, y \geq 0\) is

Which of the following contribute to increase in population density?