p-Block Elements · Chemistry · AP EAPCET
MCQ (Single Correct Answer)
Which of the following are correct?
i. Basic structural unit of silicates is $-R_2 \mathrm{SiO}-$
ii. Silicones are biocompatible
iii. Producer gas contains CO and $\mathrm{N}_2$
The correct option is
Which of the following reactions give phosphine?
i. Reaction of calcium phosphide with water
ii. Heating white phosphorous with concentrated NaOH solution in inert atmosphere
iii. Heating red phosphorous with alkali
Observe the following stoichiometric equation
$$ \mathrm{P}_4+3 \mathrm{OH}^{-}+3 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{PH}_3+3 x^{-} $$
What is the conjugate acid of $x^{-}$?
Identify the correct statements
i. Oxidation of $\mathrm{NaBH}_4$ with $\mathrm{I}_2$ gives $\mathrm{B}_2 \mathrm{H}_6$
ii. $\mathrm{B}_2 \mathrm{H}_6$ burns in oxygen and releases an enormous amount of energy
iii. $\mathrm{B}_2 \mathrm{H}_6$ on hydrolysis gives a tribasic acid
Identify the $$P$$ and $$Q$$ of the following reaction
$$P+Q \longrightarrow\left[B(O H)_4\right]^{-}+\mathrm{H}_3 \mathrm{O}^{+}$$
Among $$\mathrm{P}_4, \mathrm{~S}_8$$ and $$\mathrm{N}_2$$ the elements which undergo disproportionation when heated with NaOH solution.
Identify the correct statements about the anomalous behaviour of boron.
I. Boron trihalides can form dimeric structures.
II. Boron shows +1 as stable oxidation state.
III. Maximum covalency of boron is four.
IV. Boron does not form $$\mathrm{BF}_6^{6-}$$ ion.
Which of the following is formed when $$\mathrm{SO}_3$$ is absorbed by concentrated $$\mathrm{H}_2 \mathrm{SO}_4$$ ?
Identify the correct statements about boron.
I. It has high melting point.
II. It has high density.
III. It has high electrical conductivity.
IV. B-10 isotope of it has high ability to absorb neutrons.
Assertion (A) HCl gas is dried by passing through concentrated H$$_2$$SO$$_4$$.
Reason (R) HCl gas reacts with NH$$_3$$ that gives white fumes.
What would be the product of following reaction?
$$\mathrm{SiCl}_4 \stackrel{\text { Excess of } \mathrm{H}_2 \mathrm{O}}{\longrightarrow} \text { ? (Major product) }$$
Identify (P) and (Q) in the following reaction.
Match the following compounds with their corresponding physical properties.
Column I | Column II | ||
---|---|---|---|
A. | $$\mathrm{IBr}$$ | 1. | Orange solid |
B. | $$\mathrm{CIF}_3$$ | 2. | Yellow-green liquid |
C. | $$\mathrm{BrF}_3$$ | 3. | Black solid |
D. | $$\mathrm{ICl}_3$$ | 4. | Colourless gas |