Boric acid on heating at 150°C gives

1.  B2O3

2.  H2B4O7

3.  HBO2

4.  H2BO3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Mellitic acid formed by the oxidation of graphite with 

1.  Chromic acid

2.  Alkaline KMnO4/heat

3.  Fuming HNO3

4.  dil. HNO3

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Incorrect option about 2-D sheet silicates is

1. Two O-atoms of each tetrahedra are shared

2. General formula is Si2O5n2n-

3. Co-ordination number of Si is 4

4. Number of O-atoms per tetrahedra unit is 52

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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The correct formula of colemanite mineral is:

1.  Ca2B6O115H2O

2.  CaB4O7.NaBO28H2O

3.  2Mg3B8O15MgCl2

4.  Ca2B6O11.3H2O

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Hydrolysis of SiF4 gives a compound, in which maximum coordination number of Si is

1.  6

2.  4

3.  8

4.  7

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 55%
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H2C2O4ΔGas(A)+Gas(B)+liquid(C).

Gas (A) burns with blue flame and it oxidised to (B)
Gas(A)+CI2(D) NH3,(E)

A, B, C and E are respectively

1.  CO, CO2, COCl2 and HCONH2

2.  CO, CO2, H2O, COCl2

3.  CO2, CO, H2O, HCONH2

4.  CO, CO2, H2O, NH2CONH2

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 53%
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Which among CH4SiH4GeH4 and SnH4 is most volatile?

1.  CH4

2.  SiH4

3.  GeH4

4.  SnH4

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 61%
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Borazine is called inorganic benzene. It has a ring structure with alternate BH and NH groups. Which of the following statements is not correct about borazine?

1.  Each B and N atom is sp2 hybridized

2.  Borazine satisfies the (4n + 2)π electrons Huckel's rule

3.  Like organic benzene, borazine does not give addition product with HCI

4.  Borazine contains dative pπ - pπ bond

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 64%
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The incorrect statement for orthoboric acid is

1.  It can not be titrated satisfactorily with NaOH, as a sharp endpoint is not obtain

2.  The acidity of its aqueous solution increases upon the addition of ethylene glycol

3.  It is a weak electrolyte in water

4.  It has a three-dimensional structure due to hydrogen bonding

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
From NCERT
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The coordination number of Al in aluminates is:

1.  3

2.  6

3.  1

4.  4

Subtopic:  Boron Family- Preparations, Properties & Uses |
 67%
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