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(2) Chemotactic

(2) Light period longer than a critical day length

 Lysenko discovered vernalization. 

(1) P_fr–form

(4) All the above

The chemical reaction in which a single product is formed from two or more reactants and energy is also evolved , is known as combination reaction. When a single reactant on gaining enrgy decomposes to give two or more simpler products, such a reaction is called a decomposition reaction.

Correct option: c. Conscientiousness

Correct option (B) Gout

Correct option (A) 10%

(C) Cytosine + Guanine

A simple sentence is one that has only one subject and one predicate or has only one finite verb.

(a) Parallel to the front border line

While shelving, the spines of books are kept Parallel to the front border line.

Van Arkel method for refining titanium: The volatile iodide of titanium (formed after treatment of impure titanium with iodine) is electrically heated using tungsten filament above 1700 K. Pure titanium gets deposited on the filament and as the deposition goes on, the current is steadily raised to maintain the temperature.

Ti_(s) (Impure) + 2I_2(g) \(\overset{523\,K}\longrightarrow\) TiI_4(g) (Volatile iodide of titanium)

TiI_4(g) (Volatile iodide of titanium) \(\overset{1700\,K}\longrightarrow\) + Ti_(s) + 2I_2(g) (Pure)

(d) immediate success

Oxygen in H₂O₂ = -1

It is used as rocket fuel in space research.

Avogadro’s number = 6.022 × 10²³

Hydrogen bonding is defined as “Attractive force which binds hydrogen atom of one molecule with electronegative atom (F, O, or N) of another molecule.

Radiation lies : 100 nm = UV

Heat  is not a state function.

Molecular mass of ethanol = 46.06

% carbon = 24/46 x 100 = 52

% of hydrogen = 6/46 x 100 = 13

Work is not a state function.

Entropy is not an intensive property.

Extensive property.

When conc. HNO₃ is dropped on red-hot pumice stone a brown gas mixture evolves. When this gas mixture is passed through a 'U' tube dipped in a freezing mixture a yellow coloured liquid and a colourless gas is obtained. This gas is oxygen as it is completely absorbed by alkaline pyrogallate solution brown. Hence, nitric acid contains oxygen

4HNO₃=4NO₂+2H₂O+O₂

When nitric acid is dropped over heated saw dust (pumice stone) it catches fire spontaneously , i.e., bursts into flame.

Being a volcanic rock  pumice stone can withstand high temperature without being melted and is unreactive with concentrated nitric acid. Here is how these properties help during thermal decomposition of nitric acid.

When  concentrated nitric acid is made to fall dropwise on highly heated pumice stone it remains chemically unreacted with the stone but readily spreads over its highly heated  surface and thus the thin molecular layers of nitric acid easily  get the sufficient thermal kinetic energy required for their decomposition from the molecules of pumice stone vibrating with high thermal kinetic energy at high temperature and we see the following dismutation  reaction to occur ..

\(4HNO_3 \to 4NO_2 + 2NH_2O + O_2\)

Pumice stone is mainly used to separate out oxygen from Nitric acid.

Pumice stone is a volcanic rock and can be withstand high temperature. When Nitric acid is to be decomposed, it is made to fall dropwise on heated pumice stone, where nitric acid's thin layer gets sufficient kinetic energy for its decomposition.

\(4HNO_3 \to 4NO_2 + 2NH_2O + O_2\)

a) Al is the  Element that is in group 13 and third period both.
b) Sc

a) Third period
b) A(NO3)2
c) Conductor of electricity

We have: 

frequency, \(\nu\) = \(\frac{me^4}{(4\pi)^3\epsilon_o^2(\frac{h}{2\pi})^3}\) \(\Big[\frac{1}{(n-1)^2}-\frac{1}{n^2}\Big]\)

= \(\frac{me^4(2n-1)}{(4\pi)^3\epsilon_o^2(\frac{h}{2\pi})^3n^2(n-1)^2}\)

For large n, \(\nu\) = \(\frac{me^4}{32\pi^3\epsilon_o^2(\frac{h}{2\pi})^3}\times\frac{1}{h^3}\)

Orbital frequency, \(\nu_e=\frac{\nu}{2\pi r}\)

In Bohr model, \(\nu\) = \(\frac{\frac{nh}{2\pi}}{mr}\) and r = \(\frac{4\pi\epsilon_o(\frac{h}{2\pi})^2}{me^2}\)

\(\therefore\) \(\nu_e\) = \(\frac{\frac{nh}{2\pi}}{2\pi mr^2}\) = \(\frac{me^4}{32\pi^3\epsilon_o^2(\frac{h}{2\pi})^3}\times\frac{1}{n^3}\)

which is same as for large n.

Derivation of frequency of radiation emitted when a hydrogen atom de excites from level n to level (n-1). 

 v = me⁴ (2n-1) / (4\(\pi\))³ (h/2\(\pi\))³ n² (n-1)²

Comparing for large values of n, with classical freuency v = v / 2\(\pi\)r

Neel temperature : The neel temperature is the temperature above it the anti-ferromagnetic material become paramagnetic. Temperature dependence of the magnetic susceptibility of paramagnetic materials is given by the curie law.

X_m = \(\frac{\mu_0nm^2}{[3k(T-T_e)]}\)

X_m = \(\frac c{(T-T_c)}\)

where μ₀ = it is magnetic permeability at vaccume

n = atomic density

m = dipolar magnetic moment of atom A

k = boltzman constant

T_c = curie temp in K

C = curie constant k^-1

An adiabatic process is a process where the net heat transfer to the working gas is zero. An isolated system is a system that is completely shut off from the surroundings.

The zero error in a spring balance can be found by suspending it freely.

Hold the spring balance in your hand and do not place any weights on it.

Note, where the pointer points.

If it is zero, then there is no zero error.

If the pointer is slightly down (say 1) then zero error is -1. So, whatever weight you measure, subtract 1 from it to get the exact result.

Now, the range of the spring balance is the maximum weight that it can measure. So, if the spring balance has maximum reading as 100, then the range of the spring balance is 0-100 kg.

The least count is found by dividing the range of the scale with the total number of divisions on the scale.

If the total number of divisions on the scale is 100, then the least count is 100/100 = 1 kg.

So, the least weight difference that a spring balance can measure is 1 kg.