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Calculate the number of moles of H2 in a sample containing 3.011×103 H2 molecules.

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°Care 440mmHg for pentane and 120mm Hg for hexane. The mole fraction of pentane in the vapour phase would be:

CH3CN Na+C2H5OH⟶ XThe compound X is:[MP PMT 1983; BHU 1984]

1-Chloropropane and 2-Chloropropane are:

Which of the following is a measure of degree of unsaturation in oils and fats?

What is the hybridization of sulphur in its crown ring structure?

What is the molecular formula of nonane, octane and decane respectively?

The compound that gives the most stable carbonium ion on dehydration is:

Which of the following is paramagnetic?

Find the work done when 2 moles of hydrogen expands isothermally from 15 L to 50 L against a constant pressure of 1 atm at 250C.

Identify A, B and C.(i) Pepsinogen a→ pepsin(ii) Maltose b→ Glucose + Glucose(iii) Nucleic acid c→ Nucleotides

The ratio fo rates of diffusion of SO2,O2 and CH4 is

When heated above 916∘C, iron changes its BCC crystalline form to FCC without the change in the radius of atom. The ratio of density of the crystal before heating and after heating is (Given : √3=1.73 and √2=1.41):

SiO2 reacts with :

Which is not present in Grignard reagent[CBSE PMT 1991]

The total number of lone-pairs of electrons in melamine is _____

Which is true for a liquid-gas equilibrium having an equilibrium constant K?

Which of the following reactions have maximum heat of neutralisation?

P4O10 undergoes complete and violent hydrolysis to give __ acid.

Which of the acid possesses oxidizing, reducing and complex forming properties?

In alkane the bond angle is

Which one of the following series contains only electrophiles?

If 3 gm of glucose (mol. wt. 180) is dissolved in 60 gm of water at 150C. Then the osmotic pressure of this solution will be

Silica reacts with a hydride of superhalogen to form 'X'. On hydrolysis of 'X', another compound 'Y' is formed. 'Y' on heating at 1000∘C losses water to form 'Z'.'Z' can also be prepared by the reaction

Standard cell potential is measured

Calculate the number of KClO3 formula units present in 0.5 kilomoles of KClO3.

CO2 is isostructural with

The composition of a sample of wustite (ore of Fe) is Fe0.93 O1.00. What percentage of the iron is present in the form of Fe(III)?

Find the general situation of sin−1(dy/dx)=x+y using variable separable method.

STATEMENT-1 Molecularity has no meaning for a complex reaction.STATEMENT-2 Molecularity is defined only for Rate determining Step.Examine the statements carefully and mark the correct answer according to the instructions given below:

4-MethylacetophenoneKMnO4−−−−−−−→KOH, heatAdil. H2SO4−−−−−−→BThe final product 'B' is:

Estimation by 'Flame photometry' is not helpful in the case of

Which of the following gas molecule has the largest mean free path at the same pressure and temperature ?

For the synthesis of ammonia, Kp and Kc are related as:

Which of the following can be classified as autoprotolysis reactions?

The IUPAC name of the compound (CH3)2 CH CH2CH2Cl is?

Preparation of alkyl halides in laboratory is least preferred by [DPMT 2000]

The strongest conjugate base is :

Which of the following represents an incorrect set of quantum numbers?

A solution A has 10 gm of solute B dissolved in 2 moles of solvent. What is the mole fraction of the solute?

How many years would it take to spend one Avogadro’s number of rupees at a rate of 10 lakh of rupees in one second?

When two non-reacting gases are mixed, a ______ is obtained

Specific conductance of 0.1 M HA is 3.75×10−4ohm−1cm−1. If λ∞(HA)=250 ohm−1cm2mol−1, the dissociation constant Ka of HA is :

It takes 26 s for 10 mL of H2 to effuse through a porous membrane. It takes 130 s for 10 mL of an unknown gas to effuse. Hence, molecular weight of the unknown gas is (in gmol−1 )

White phosphorus can be separated from red phosphorus by:

A substance which can act both as an antiseptic and disinfectant is:

What is the meaning of density as a standalone term?

Let’s try another question.Which of the following are possible wedge – dash representations for Glyceraldehyde.Assume the H and OH on the second carbon are coming out of the plane.

In this sequence X, Y and Z are respectively

The rate constant for the reaction 2N2O5→4NO2+O2is 3.0×10−5 sec−1. If the rate is 2.4×10−5 mol L−1 sec−1, then the concentration of N2O5 (in mole L−1) is