Lustre, electrical and thermal conductivity of metals can be explained by the theory of :

Lanthanoids (Ln) when heated with nitrogen, form compounds of the type ______________

When \(Br_2\) is treated with aqueous solution of \(NaF, NaCl, NaI\) separately:

Which reagent can be employed to distinguish Benzaldehyde and Propanal ?

Read the passage carefully and answer the Questions
Werner in 1898, propounded his theory of coordination compounds. In coordination compounds metals show two types of linkages (valences)-primary and secondary. The primary valences are normally ionisable and are satisfied by negative ions. The secondary valences are non-ionisable. These are satisfied by neutral molecules or negative ions. The secondary valence is equal to the coordination number and is fixed for a metal. The ions or group bound by the secondary linkages to the metal have characteristic spatial arrangements corresponding to the different coordination numbers. Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio. However, they differ in the fact that double salts such as carnallite, Mohr's salt, potash alum etc. dissociate into simple ions completely when dissolved in water. But complex ions do not dissociate completely into simple ions.
Which of the following is a double salt?

What is the first step in acid catalyzed dehydration of alcohol?

A solution of \(CuSO _4\) is electrolyzed for 1 minute with a current of 1 ampere. Given the atomic mass of Cu as \(63 g mol ^{-1}\), the mass of copper deposited at the cathode is

The solution of \(\frac{7 x+12}{x-9}<4, x \neq 9\) is:

Three identical resistors are connected first in series to an electrical voltage V. Let I be the total current flowing in the circuit. These resistors are disconnected and again connected in parallel with the same source. Which of the following statements are true?
(A) The potential difference across each resistor is V/3 in series connection
(B) The potential difference across all three resistors in parallel connection is 3V
(C) The current flowing in each resistor in series connection is the same as I
(D) The current flowing through each resistor in parallel combination is equal to 31
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Electrostatic shielding is the phenomenon of protecting a certain region of space from :

Match List I with List II

LIST I	LIST II
A. Brackett series	I. Visible region
B. Balmer series	II. Ultraviolet region
C. Paschen series	III. far infrared region
D. Lyman series	IV. infrared region

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Match List - I with List - II.

List - I	List - II
(A) Sexually transmitted disease	(I) Assisted reproductive technology
(B) Intra-uterine devices	(II) Detection of genetic disorder
(C) In-vitro fertilization	(III) Contraception method
(D) Amniocentesis	(IV) AIDS

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Match List-I with List-II

List-l (Species)	List-II (Population interaction terms)
(A) Monarch butterfly	(I) Brood parasitism
(B) Cuckoo bird	(II) Commensalism
(C) Cuscuta	(III) Camouflage
(D) Sea anemone and Clown fish	(IV) Parasitism

Choose the correct answer from the options given below: