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C. Body centered cubic

(c) 3.45 g/cc

The Correct option is (c) 400 GPa 

The Correct option is (d) 3000°C

(b) Silicon carbide

Three dimensional molecules with cross links are formed in the case of a Thermosetting plastic.

(c) C₆H₅ - CH = CH₂

Polymer used in the manufacturing of orlon is PAN.

(a) polyester

(c) fine gray powder

(a) Wolfram.

The Correct option is (a) TiO₂

(b) Bakelite (phenol formaldehyde)

C. Martensite

The hardest known material is Diamond.

(d) CH₂=CH–Cl

(d) caprolactam

(c) Glyptal.

(b) polyacrylonitrile

(b) Cementite 

(c) Ferrite.

(b) polyester

(c) Nylon 6.

(d) Petroleum

(a) in the manufacture of synthetic rubber

(a) An adaptation is any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.

(b) The birth rate is also known as natality. ∙ It is the rate of birth, hatching, germination, or vegetative propagation of new individuals per unit of population per unit of time. ∙ This determines whether the population is increasing or decreasing. ∙ It is used on both male and female individuals.

(c) Mortality is defined as the state of the individual being dead. The mortality rate is the death rate of a population which is calculated on the basis of the deaths in the particular region.

(d) Immigration means an animal establishes a home in a habitat because it has resources it can utilize or because the habitat is ideal for them. Emigration means an animal leaves its home because the habitat is no longer ideal for them and they need to find a more suitable environment.

(e) Emigration means an animal leaves its home because the habitat is no longer ideal for them and they need to find a more suitable environment. Animals that immigrate or emigrate do not return to the land they left.

(b) caprolactum

Correct option is (a) Acetic acid

Carboxylic acids with even number carbon atoms have higher melting point than those with odd number carbons atom. Among acetic acid and butanoic acid the latter molecules face more repulsion hence acetic acid has higher melting point.

• The third law of thermodynamics states that the entropy of any perfectly ordered, crystalline substance at absolute zero is zero. 
• At temperatures greater than absolute zero, entropy has a positive value, which allows us to measure the absolute entropy of a substance.

• The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. 

• This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state

Amorphous substances have _______.
(i) only short-range order 
(ii) indefinite heat of fusion

• An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. 
• Such solids include glass, plastic, and gel. 
• Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.
   

(i) Aniline, N-ethylethanamine, Etanamine 

(ii)Ethanamine, ethanol, ethanoic acid 

(iii) N, N dimethylmethanamine, methanamine, N-methylmethanamine

1. (b) futility

2. (a) di

3. (d) tetra

4. (c) mono

Correct option is (2) [Xe]4f¹⁴5d⁹6s¹

Pt(Z = 78) = [Xe] 4f¹⁴5d⁹6s¹

Correct option is (3) If assertion is true but reason is false

\(CH_3 -CH_2 - \overset{Br\\|}{CH} -CH_3 \xrightarrow{AlC.KOH} \underset{\text{more substituted alkene form}\\{\text{ predominantly this called }\\{\text{Saytzeff's product.}}}}{CH_3 - CH = CH - CH_3}\)

Mankonikov's rule's are apply on the hydrohalogenation of alkene not in the dehydrohalogenation of halo alkanes. Saytzeff's rules are applied in the dehydrohalogenation of halo alkane.

Therefore, Assertion is correct but reason is incorrect.

Considering all given compounds are in cation from -

(i) CH₃ - \(\overset{+}{CH}\) - CH₃

(ii) CH₃ - \(\overset{+}{CH}\) - OCH₃

(iii) CH₃ - \(\overset{+}{CH}\) - \(\overset{O}{\overset{||}{C}}\) - CH₃

Compound (1), cation stabilized by hyper conjugation with  6 hydrogen

in compound (2), cation stabilized by hyper conjugation as well as by loan pair electron of oxygen.

CH₃ - \(\overset{+}{CH}\) - O - CH₃ ↔ CH₃ - CH = \(\overset{+}{O}\) - CH₃

it means compound (2) also stablilized by Resonance but in compound (3), the cation stabilized by hyperconjation with 3 hydrogen but destabilized by strong electron with drawing group \(\Big(-\overset{O}{\overset{||}{C}}-CH_3\Big)\) and we also know that Resonance is powerful

Than Hyper conjugation because of that compound (2) is more stabilized than compound (1)

Hence order of stability

2 > 1 > 3

THE HINDUSTAN TIMES.

(C) Muhammad lqbal

It was written by Mohammad Iqbal and published on August 16, 1904 in the weekly journal Ittehad. It became an anthem of opposition to the British rule in India