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(b) White phosphorous is P₄ and tetrahedral

Correct option is B) to give orders

Correct option is C) played

Alternative uses of resources give rise to the problem of Choice.

Siddhartha had become a wise and popular teacher, able to journey into deep understanding of the nature of reality during periods of meditation. It is believed that Siddhartha achieved enlightenment while sitting under a Bodhi tree. This was when Siddhartha became the Buddha, an enlightened being or 'one who is awake'.

Individual economic unit refers to one unit which participate in production mechanism for example, a producer, a consumer, a firm,etc. Microeconomics deals with the study of individual economic units.

CONCEPT:

• Combustion engine: An engine that converts chemical energy into mechanical energy by combustion of a fuel and generates mechanical power. There are two types of combustion engines:

1. Internal combustion engine
2. External combustion engine.

• 4 stroke engines and 2 stroke, Diesel engines are types of Internal combustion engines.

External Combustion Engine:

• It is such a heat engine, the heat needed for the working substance is produced by burning the fuel outside the cylinder and piston arrangement of the engine.
• E.g. A steam engine is an external combustion engine. Here boiler is used to create high-pressure steam from the burning of fuel. Then it is fed to the steam engine to produce required work in form of rotation of the crankshaft.

Correct option  (2)

Explanation:

S_N1 is  a two step reaction in which first step is rate determining step. Hence the peek of first step is higher than second step.

Correct option is (C)

The carbocation fromed is very unstable.

So it is inactive towards S_N1

The correct option (3) b > c > d > a   

Explanation:

The S_n1 reactivity is proportional to stability of carbocations formed in the rate determining step.

Ethanol is a good solvent. In addition, tincture of iodine has better solubility in ethanol than water and thus ethanol is mostly used in the making of tincture of iodine.

a). Both assertion and reason are true, and reason is the correct explanation of assertion.

Correct option (4) strongest hydrogen bonding

Explanation:

HF has strong hydrogen bond 

∴ it has highest B.P. among hydrogen halides.  

Correct option (4)  Assertion is incorrect but  Reason  is correct

Explanation:

Heamatite : Fe₂O₃

110 is the thermal conductivity values for Brass.

237 is the thermal conductivity values for Copper

0.58 thermal conductivity values for Water.

237 is the thermal conductivity values for aluminium.

Number of moles of CO₂ (n) = \(\frac{8.8\ g}{44\ g\ mol^{-1}} = 0.2\)

According to ideal gas equation,

pV = nRT   Or  V = \(\frac{nRT}{p}\) 

= \(\frac{0.2\ mol\times0.083\ bar\ L\ K^{-1}\ mol^{-1}\times304.25\ K}{1\ bar}\) 

=5.05L

(b) The collisions between the molecules increase

p₁ = 1 bar p = ? 

V₁ = 500 dm³  V₂ = 200 dm³

Temperature remains constant.

According to Boyle’s law,

p₁V₁ = p₂V₂

Or p₂ = \(\frac{p_2V_2}{V_2}\) 

p₂ = \(\frac{1\ bar\times500\ dm^3}{200\ dm^3}\) = 2.5 bar

1. Most probable speed is the speed possessed by the maximum fraction of molecules of the gas at a given temperature.

2. If there are ‘n’ molecules in a sample and their individual speeds are u₁ , u₂ ……… u_n , then, average speed of molecules, u_av is given by the equation:

\(u_{av}=\frac{u_1+u2+...+u_n}{n}\)