If 11.1 mg of CaCl2 and 12 mg of MgSO4 are present in 2 litres of water, what is its hardness (in grams CaCO3 / ppm)

1.  5

2.  10

3.  15

4.  20

View Answer  
4
Correct Answer :

10


Explanation :
No Explanation available for this question

The correct order of stability for the following superoxides is

1.  KO2 > RbO2 > CsO2

2.  RbO2 > CsO2 > KO2

3.  CsO2 > RbO2 > KO2

4.  KO2 > CsO2 > RbO2

View Answer  
4
Correct Answer :

CsO<sub>2</sub> &gt; RbO<sub>2</sub> &gt; KO<sub>2</sub>


Explanation :
No Explanation available for this question

A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form A and HCl. A is mixed with NH3 and heated to 200 0C to from B. The formula of 'B' is

1.  H3BO3

2.  B2O3

3.  R3N3H6

4.  B2H6

View Answer  
4
Correct Answer :

R<sub>3</sub>N<sub>3</sub>H<sub>6</sub>


Explanation :
No Explanation available for this question

Hydrolysis of SiCl4 gives compound X and HCl. On heating to 1000 0C, X loses water and forms Y. Identify X and Y, respectively

1.  SiO2 and Si

2.  H4SiO4 and SiO2

3.  SiO2 and SiC

4.  H4SiO4 and SiC

View Answer  
4
Correct Answer :

H<sub>4</sub>SiO<sub>4</sub> and SiO<sub>2</sub>


Explanation :
No Explanation available for this question

The number of P-O bonds and lone pairs of electrons present in P4O6 molecule, respectively

1.  12, 16

2.  12, 12

3.  8, 8

4.  12, 4

View Answer  
4
Correct Answer :

12, 16


Explanation :
No Explanation available for this question

X, Y are anhydrides of sulphurous acid and sulphuric acid, respectively. The hybridization state and the shape of X and Y are

1.  [(Sp2, angular), (sp3, tetrahedral)]

2.  [(Sp2, angular), (Sp2, angular)]

3.  [(Sp2, angular), (Sp2, planar triangular)]

4.  [(Sp3, planar), (Sp3, planar)]

View Answer  
4
Correct Answer :

[(Sp2, angular), (Sp2, planar triangular)]


Explanation :
No Explanation available for this question

Identify B in the above reaction

1.  CaOCl2

2.  Ca(ClO3)2

3.  Ca(OH)2

4.  Ca(ClO2)2

View Answer  
4
Correct Answer :

Ca(ClO<sub>3</sub>)<sub>2</sub>


Explanation :
No Explanation available for this question

Which of the following statements about noble gases are correct(I) XeO3 is an explosive tetrahedral molecule(II)In Fisher Ringe Method, a mixture of CaCl2 and CaC2 is used to remove N2 and O2(III) He and Ne are chemically inert due to lack of d-orbital and high ionization potential.(IV) At 173 K He and Ne are adsorbed on activated charcoal.The correct answer is

1.  I and II

2.  II and III

3.  II, III and IV

4.  I, II, III and IV.

View Answer  
4
Correct Answer :

II and III


Explanation :
No Explanation available for this question

Which one of the following pairs of complexes has the effective atomic number equal to 36 for the transition element

1.  [Co(NH3)6]Cl3 ; K3[Fe(CN)6]

2.  [Co(NH3)6]Cl3 ; [Cr(H2O)6] Cl3

3.  [Fe(CO)5] ; K4[Fe(CN)6]

4.  [Fe(CO)5] ; K3[Fe(CN)6]

View Answer  
4
Correct Answer :

[Fe(CO)<sub>5</sub>] ; K<sub>4</sub>[Fe(CN)<sub>6</sub>]


Explanation :
No Explanation available for this question

5 l aqueous solution is kept in the presence of oxygen and suitable micro-organism for five days at 20 0C. If the O2 consumed is 0.2 g, the BOD value of the sample is

1.  4 ppm

2.  0.4 mg l-1

3.  40 ppm

4.  20 mg l-1

View Answer  
4
Correct Answer :

40 ppm


Explanation :
No Explanation available for this question
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