A few substances are attracted very strongly by magnetic field. They can be permanently magnetized. Their domains get oriented in the direction of the magnetic field even after magnetic field is removed. This substance is :

Read the passage carefully and answer the Questions
Carbonyl compounds such as aldehydes, ketones, and carboxylic acids play an important role in the biochemical process of plants and animal kingdom. Many aldehydes and ketones find applications in dye, perfumery and other industries.
The carbonyl carbon atom is \(s p^2\)-hybridized forming three sigma and one pi-bond with oxygen.
C-O bonds are polar bond due to high electronegativity of oxygen than carbon.
Hence the carbonyl carbon behaves as an electrophilic center and oxygen as a nucleophilic centre.
Primary and secondary alcohols yield aldehydes and ketones respectively upon oxidation with variety of oxidixing agents.
The boiling points of aldehydes and ketones differ from hydrocarbons and ethers.
Aldehydes and ketones undergo nucleophilic addition reaction due to presence of electrophilic carbonyl carbon.
Nucleophile and a proton add across the carbon oxygen double bond.
In polar C-O bond in carbonyl compounds, the nature of carbon and oxygen atom is

Arrange the following amines in increasing order of their basic strength in the gaseous phase
(A) \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
(B) C\(_6\)\(\mathrm{H}_5CH\)\(_2\)\(\mathrm{NH}_2\)
(C) (CH\(_3\))\(_3\)N
(D) CH\(_3\)\(\mathrm{NH}_2\)
Choose the correct answer from the options given below:

What are the number of chiral centers in the given Alkyl halide

A galvanic cell behaves as electrolytic cell when?

Inversion of cane sugar is a pseudo first order reaction
\(C _{12} H _{22} O _{11}+ H _2 O \xrightarrow{ H ^{+}} C _6 H _{12} O _6+ C _6 H _{12} O _6\)
Choose the correct answer from the options given below:

The total EMF of a voltaic cell is greater than zero. Which of the following statements is true?

Which of the following serve as an important biofertiliser in paddy field?

List-I (Name reaction.)	List-II (Reaction)
(A) Williamson ether synthesis	(I)
(B) Hydroboration oxidation	(II)
(C) Reimer-Tiemann reaction	(III)
(D) Friedel Craft Acylation reaction	(IV)

Choose the correct answer from the options given below:

In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk. The milk contained the _________ and was nutritionally a more balanced product for human babies than natural cow-milk.

Two point charges, \(+2 \mu C\) and \(-3 \mu C\), are separated by a distance of 20 cm in the air. At what point between the two charges and on the line joining the two charges is the electric potential zero?
(Take the potential at infinity to be zero)

Identify the correct statement with respect to Mycorrhiza.
A. Fungal symbiont absorbs phosphorus from the soil and passes it on to the roots of the plant.
B. Many members of the genus Glomus form mycorrhiza.
C. In paddy fields, mycorrhiza serve as an important biofertilizer.
D. Plants with mycorrhiza show tolerance to salinity and drought.
Choose the correct answer from the options given below:

Select and arrange the steps of gel electrophoresis in correct sequence.
(A) Separation of DNA fragments according to their size
(B) Staining of DNA with ethidium bromide
(C) Forcing DNA fragments to move towards anode
(D) Eluting the desired DNA fragments
(E) Visualisation under UV radiation
Choose the correct answer from the options given below: