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Recent questions tagged chemistry

The dehydration yield of cyclohexanol to cyclohexene is 75%.What would be the yield if 100g of cyclohexanol is dehydrated?

asked Oct 29, 2013 by sreemathi.v

1 answer

The no of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution

asked Oct 29, 2013 by sreemathi.v

1 answer

A solution is 0.5m in $MgSO_4$,0.1M $Alcl_3$ and 0.2M in $(NH_4)_2SO_4.$The total ionic strength is

asked Oct 29, 2013 by sreemathi.v

1 answer

The total ionic strength (total molarity of all ions) Containing 0.1m of $CuSO_4$ and 0.1m of $Al_2(SO_4)_3$ is

asked Oct 29, 2013 by sreemathi.v

1 answer

The molality of 1 litre solution with $X\%$ by weight $H_2SO_4$ is equal to 9.The weight of the solvent present in the solution is 910g.The value of $X$ :

asked Oct 29, 2013 by sreemathi.v

1 answer

If sea water contains 63ppm $NO_3^{-1}$ and its density is 1.01g/ml,the approximate molarity of sea water is

asked Oct 28, 2013 by sreemathi.v

1 answer

The molality of 1M solution of NaCl (specific gravity $1.0585g/ml$) is :

asked Oct 28, 2013 by sreemathi.v

1 answer

The amount of $H_2SO_4$ present in 1200ml of 0.1m solution is

asked Oct 28, 2013 by sreemathi.v

1 answer

Consider the following reaction: $2NH_3(g)+CO_2(g)\rightarrow (NH_2)_2CO(aq)+H_2O(l)$. If $637.2\;g$ $NH_3$ and $1142\;g$ $CO_2$ are allowed to react, then which one is the limiting reagent ?

asked Oct 28, 2013 by sreemathi.v

1 answer

Total number of atoms present in $1.0cm^3$ of solid urea (density 0.3g/$cm^3$) at $25^{\large\circ}$ are

asked Oct 28, 2013 by sreemathi.v

1 answer

If molecular weight of glucose-1-phosphate is 260 and its density is 1.5g $cm^{-3}$ ,what is the average volume occupied by 1 molecule of this compound ?

asked Oct 28, 2013 by sreemathi.v

1 answer

A gaseous alkane was exploded with oxygen.The volume of $O_2$ for complete combustion to $CO_2$ formed was in the ratio of 7 : 4.The molecular formula of alkane is

asked Oct 28, 2013 by sreemathi.v

1 answer

Amount of oxygen required for combustion of 1kg of a mixture of butane and isobutane is

asked Oct 28, 2013 by sreemathi.v

1 answer

To neutralize completely 20ml of 0.1m aqueous solution of phosphorus $(H_3PO_3)$ acid the volume of 0.1m aqueous KOH solution required is

asked Oct 28, 2013 by sreemathi.v

1 answer

$6.02\times 10^{20}$ molecules of urea are present in 100ml solution.The concentration of urea solution is

asked Oct 28, 2013 by sreemathi.v

1 answer

25ml of a solution of barium hydroxide titration with 0.1molar solution of hydro-chloric acid gave a titre value of 35ml.The molarity of barium hydroxide is

asked Oct 28, 2013 by sreemathi.v

1 answer

What volume of hydrogen gas at 273K and 1atm pressure will be consumed in obtaining 21.6g of element boron (at.mass=0.8) from the reduction of boron trichloride with hydrogen ?

asked Oct 28, 2013 by sreemathi.v

1 answer

In compound $C,H,N$ atoms are present in 9 : 1 : 35 by weight .Molecular weight of compound is 108.It molecular formula is

asked Oct 28, 2013 by sreemathi.v

1 answer

Which of the following changes with increases in temperature?

asked Oct 28, 2013 by sreemathi.v

1 answer

Number of atoms in 558.5g $Fe$ (at.wt =55.85) is

asked Oct 28, 2013 by sreemathi.v

1 answer

One litre of $CO_2$ is passed over hot cake.The volume becomes 1.4litre.The percent composition of products is

asked Oct 28, 2013 by sreemathi.v

1 answer

On repeated sparking 10ml of mixture of carbon monoxide and nitrogen required 7ml of oxygen for combustion of CO and $N_2$ to $CO_2$ and NO.The volume of nitrogen in mixture is (all volumes are measured under identical conditions).

asked Oct 28, 2013 by sreemathi.v

1 answer

20ml of 0.1m $H_3BO_3$ solution on complete neutralization requires __________ml of 0.05m $NaOH$ solution

asked Oct 28, 2013 by sreemathi.v

1 answer

One mole of potassium chlorate is thermally decomposed excess of aluminum is burnt in the gaseous product .How many mole of aluminum oxide are formed?

asked Oct 28, 2013 by sreemathi.v

1 answer

If half mole of oxygen combine with Al to form $Al_2O_3$,the weight of Al used in the reaction is

asked Oct 25, 2013 by sreemathi.v

1 answer

When the same amount of zinc is treated separately with excess of $H_2SO_4$ and excess of $NaOH$,the ratio of volumes of $H_2$ evolved is

asked Oct 25, 2013 by sreemathi.v

1 answer

Number of ions present in 2.0 litre of a solution of $0.8MK_4Fe(CN)_6$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

The mole fraction of water in 20% aqueous solution of $H_2O_2$ is :

asked Oct 25, 2013 by sreemathi.v

1 answer

A partially dried clay mineral contains 8% water.The original sample contained 12% water and 45% silica.The % of silica in the partially dried sample in nearly :

asked Oct 25, 2013 by sreemathi.v

1 answer

The percentage of sodium in a break-fast cereal,labelled as 110mg of sodium per 100g of cereal is

asked Oct 25, 2013 by sreemathi.v

1 answer

The solubility of $K_2SO_4$ in water is 16g at $50^{\large \circ}C$.The minimum amount of water required to dissolve $4g\;K_2SO_4$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

$Al_2(SO_4)_3.XH_2O$ has 8.1% aluminum by mass.The value of $X$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

The hydrated salt,$Na_2SO_4.nH_2O$ undergoes 55.9% loss in weight on heating and becomes anhydrous.The value of n will be

asked Oct 25, 2013 by sreemathi.v

1 answer

In nature,abundance of $^1H_1$ and $^2H_1$ are 99.985 and 0.015 percent respectively and water obtained from it contains $H_2O$ and $D_2O$.The number of $D_2O$ molecules in 400mL water (if density is assumed to be 1.0g/mL) will be :

asked Oct 25, 2013 by sreemathi.v

1 answer

Haemoglobin $(C_{2952}H_{9664}N_{812}O_{832}S_8Fe_4)$ is oxygen carrier. If a person has $5L$ blood and each mL of blood has $5\times 10^9$ R.B.C and each R.B.C has $2.8\times 10^8$ haemoglobin molecules, then how many grams of haemoglobin is present in the body of that person?

asked Oct 25, 2013 by sreemathi.v

1 answer

A silicon (atomic weight=28) chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon (Si) atoms are present in this chip.

asked Oct 25, 2013 by sreemathi.v

1 answer

In the first world war ,$1.1\times 10^8$kg of position gas were fired on the allied forces.If the gas is assumed to be phosgene,how many molecules of the gas correspond to the amount fired on allied forces.

asked Oct 25, 2013 by sreemathi.v

1 answer

$\large\frac{2}{3}$ of the atoms in water molecule are hydrogen .What % weight of a water molecule is the weight of 2 hydrogen atoms:

asked Oct 25, 2013 by sreemathi.v

1 answer

16g $SO_x$ occupies 5.6 litres at STP. Assuming the nature of the gas to be ideal, the value of $x$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

Which one of the following statement is correct for an electrolyte solution when its concentration is decreased?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The synthetic semi permeable membrane used in Berkeley-Hartley method is

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the following solutions has a lowest freezing point?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the following gases has the same RMS velocity at $ 27^{\circ}C$ as that of $N_2$ with RMS velocity of $ 5.0 \times 10^4\: cm.s^{-1}$ at $ 7^{\circ}C$?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the following is an example for disproportionation reaction?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the followng is correct regarding $ \sigma $ molecular orbital?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the following is not correct?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

If $a_k$ is the coefficient of $x^k$ in the expansion of $(1+x+x^2)^n$ for $k=0,1,2.......,2n$ then $a_1+2a_2+3a_3+.....+2na_{2n}$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

Assertion (A) : In the formation of oxide ion, $ O^{2-}(g) $ , first an exothermic reaction and then an endothermic reaction takes place. Reasons (R) : $O^- $ ion has comparatively large size than oxygen atom.

asked Oct 24, 2013 by thanvigandhi_1

1 answer

in the wave numbers of the first ( lowest ) two lines of a series of hydrogen atomic spectrum is $ 5331.7\: cm^{-1}$, they belong to the $(R_H = 109680\: cm^{-1}$)

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The first spectral line in the Pfund series of Hydrogen spectrum is given by $(R_H$ = Rydberg constant )

asked Oct 24, 2013 by thanvigandhi_1

1 answer

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