Which of the following ionic compounds is insolvable in water? BaSO_4 Ca(NO_3)_2

Question

Which of the following ionic compounds is insolvable in water? BaSO_4 Ca(NO_3)_2 ZnCl_2 KBr NaOH Suppose the combination of fossil fuels solds about 8.0 Times 10^13 kg of carbon to the atmosphere per year in the form of CO_2. How much oxygen gas is required to produce this amount of carbon dioxide? about 2.1 Times 10^12 kg about 1.1 Times 10^12 kg about 5.8 Times 10^12 about 4.8 Times 10^12 kg about 4.3 Times 10^12 kg What is the formula of the precipitate that forms when aqueous Fe(NO_3)_3 and aqueous Na_2CO_3 are mixed? Na_2(NO_3)_3 Na_2Fe FeCO_3 CO_3NO_3 Fe_2(CO_3)-3 Based on their boiling points, which of the following compounds has the largest dipole-dipole interaction? Propane (231 K) methyl chloride (249 K) dimethyl ether (248 K) butane (135 K) acetonitrile (355 K) Determine the bond arder of S_2^-. 3 1.5 2.5 1 2 Identify the acid in the following acid-base reaction. NH_3(aq) + H_2O(l) rightarrow NH_4^+(aq) + OH^-(aq) NH_3 OH^- H_2O This is not an acid-base reaction. NH_4^+ What are the hybridizations of the carbon atoms in CH_3CH_2COH, in order from left to right? sp^3, sp^3, sp^2 sp^2, sp^2, sp^3 sp^3, sp^3, sp^3 sp^3, sp^2, sp^2 sp^3, sp^2, sp^3 What is the theoretical yeild of phosphoric acid (H_3PO_4, 98.0 g/mol) when 10.0 g P_4O_10 (284 g/mol) reacts with excess water (18.02 g/mol)? P_4O_10(s) + 6 H_2O(l) rightarrow 4 H_3P_4O_4(aq) 10.9 g 13.8 g 40.0 g 2.50 g 10.0 g

Explanation / Answer

1) BaSO4 is insoluble in water, it is a solid and only stable in sulphuric acid,

zncl4 is highy soluble in water, ca(NO3)2 is forms hydrates with water, NaOH kBr are soluble in waters.

option a) is correct.

2) for the combustion of fossil fuel to co2 , the fossil fuel has major constituent of carbon and it also contains nitrogen, hydrogen , oxygen .

for one carbon to converts to co2 it is required one mole of oxygen molecule (or 2 MOLES of oxygen),

the amount of carbon produced in the form of co2 is 8*1012, so the oxygen required is double and it is

1.6*1013, but in option there are 1.1 *1013 and 2.1*10 13 , so the amount required is excess, i.e. the option 'a ' is correct.

3)THE EQUATION IS

3 Na2CO3 aq + 2 Fe(NO3)3 aq ----------------> 6 NaNO3 aq + Fe2(CO3)3 (S)

there fore the option 'c' is correct.

4) based on the boiling point the acetonitrile has the largest dipole dipole interactions.

the ption 'C' is correct . ( as greater the dipole interaction higher the boiling point).

5) sulphur has atomic no. 16 and electronic confi.

[Ne]3s2,3p4

bond order = (no. of . electrons in bonding -no. of electrons in antibonding)/2,

=but for s2- = total electrons 33,

here consider last cells 3s2 3p4

bond order = (8 -5)/2,

=3/2 =1.5 ,

there fore option 'd' is correct.

6)NH3+ H2O ------> NH4+ + OH-,

HERE ammonia forms conjugate acid NH4+ , THERE FORE IT IS BASE, H2O forms conjugate base OH-, there fore water is acid in thhi equilibria,

option 'b' is correct

7) CH3CH2C=OH means aldehyde , there fore order of hybridisation from left to right is SP2, SP3 SP3,

carbonyl has sp2 hybridisation, methyl has sp3 hybridisation,

there fore option 'd' is correct.

8) 10.0 grms of P4O10= 10/284=0.0352 MOLES . (284 MOL. WT OF P4O10)

ONE MOLE GIVES 4 MOLES OF H3PO4, THEN

0.0352*4=0.140 MOLES H3PO4, (98 MOL. WT OF H3PO4)

0.140* 98 = 13.8 GMS

option 'd' is correct

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