$A l F_{3} + \underset{E x c e s s}{K F} \to A$
$B F_{3} + \underset{E x c e s s}{K F} \to B$

Compound $A a n d B$ are respectively

1. $K_{3} A l F_{6} a n d K B F_{4}$

2. $K A l F_{4} & K_{3} B F_{6}$

3. $K_{3} A l F_{6} a n d K_{3} B F_{6}$

4. $K_{2} A l F_{4} & K B F_{4}$

Subtopic: Boron Family- Preparations, Properties & Uses |

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Q44:

Boranes have general formula

1. $B_{n} H_{n + 4}$

2. $B_{n} H_{n + 6}$

3. $B_{n} H_{2 n + 2}$

4. Both (1) & (2)

Subtopic: Boron Family- Preparations, Properties & Uses |

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Q45:

The stability of dihalides of group 14 elements follow which of the order?

1. $S i C l_{2} < G e C l_{2} < P b C l_{2} < S n C l_{2}$

2. $G e C l_{2} < P b C l_{2} < S n C l_{2} < S i C l_{2}$

3. $S i C l_{2} < G e C l_{2} < S n C l_{2} < P b C l_{2}$

4. $G e C l_{2} < S i C l_{2} < P b C l_{2} < S n C l_{2}$

Subtopic: Carbon Family - Preparations, Properties & Uses | Properties of Glass, Pb & Sn compounds |

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Q46:

In the reaction $2 B + 6 H N O_{3} \to A + 6 N O_{2}$

The product $A$ is

1. $B_{2} O_{3}$

2. $2 H B O_{3}$

3. $2 H_{3} B O_{2}$

4. $2 H_{3} B O_{3}$

Subtopic: Compounds of Boron- Preparations, Properties & Uses |

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Q47:

Which of the following is not correct about silicones?

1. They are chemically inert and water-repelling in nature

2. Lower silicons are oily liquids

3. They are used in making waterproof clothes

4. Good electrical conductor

Subtopic: Properties of Structure of SiO2 & Other Compounds |

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Q48:

Which of the following halide is least stable and has doubtful existence?

1. $C C l_{4}$

2. $P b C l_{2}$

3. $S i C l_{4}$

4. $P b l_{4}$

Subtopic: Properties of Glass, Pb & Sn compounds |

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Q49:

Which is not correct about $B F_{3}$ ?

1. It is stronger Lewis acid than $B C l_{3}$

2. It does not form dimer like $A l_{2} C l_{6}$

3. It can combine with $F^{-}$ ion to form $B F_{4}^{-}$ ion

4. It contains back $π$ - bonding

Subtopic: Boron Family- Preparations, Properties & Uses |

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Q50:

Which of the following regarding Boron nitride is correct?

1. Its structure is similar to diamond in which both 'B' and 'N' $s p^{3}$ hybridised

2. Its structure is similar to graphite in which both 'B' and 'N' $s p^{2}$ hybridised

3. BN posses linear structure

4. BN is ionic, hence non-directional in nature

Subtopic: Compounds of Boron- Preparations, Properties & Uses |

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Q51:

Which of the following option is correct?

1.	Stability: B⁺³ > Al⁺³ > Ga⁺³ > ln⁺³ > Tl⁺³
2.	Stability: Ga⁺ < ln⁺ < Tl⁺
3.	Ionisation enthalpy: Al < Al⁺ < Al²⁺
4.	All of the above

Subtopic: Boron Family- Preparations, Properties & Uses |

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Q52:

Correct order of thermal stability of hydride of group 14 is

1. $C H_{4} < S i H_{4} < G e H_{4} < S n H_{4}$

2. $C H_{4} > S i H_{4} > S n H_{4} > G e H_{4}$

3. $S n H_{4} < G e H_{4} < S i H_{4} < C H_{4}$

4. $C H_{4} < S i H_{4} > G e H_{4} > S n H_{4}$

Subtopic: Carbon Family - Preparations, Properties & Uses |

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$A l F_{3} + \underset{E x c e s s}{K F} \to A$
$B F_{3} + \underset{E x c e s s}{K F} \to B$

Compound $A a n d B$ are respectively

1. $K_{3} A l F_{6} a n d K B F_{4}$

2. $K A l F_{4} & K_{3} B F_{6}$

3. $K_{3} A l F_{6} a n d K_{3} B F_{6}$

4. $K_{2} A l F_{4} & K B F_{4}$

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AlF3+KFExcess→ABF3+KFExcess →B Compound A and B are respectively 1. K3AlF6 and KBF4 2. KAlF4 & K3BF6 3. K3AlF6 and K3BF6 4. K2AlF4 & KBF4

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$A l F_{3} + \underset{E x c e s s}{K F} \to A$
$B F_{3} + \underset{E x c e s s}{K F} \to B$

Compound $A a n d B$ are respectively

1. $K_{3} A l F_{6} a n d K B F_{4}$

2. $K A l F_{4} & K_{3} B F_{6}$

3. $K_{3} A l F_{6} a n d K_{3} B F_{6}$

4. $K_{2} A l F_{4} & K B F_{4}$