chemistry

EAMCET PREVIOUS PAPER QUESTIONS FORM VA GROUP ELEMENTS PART-1

1.                  Which pair of oxyacids of phosphorous contain ‘P-H’ bonds ?

1) H₃PO₄, H₃PO₃        2) H₃PO₅, H₄P₂O₇       3) H₃PO₃, H₃PO₂         4) H₃PO₂, HPO₃

2.                  Which of the following reactions yield elementary gases like N₂, H₂, O₂ as the byproducts ?

I) Cuo + NH		®	II) 2 NH		Fe
	3			+ 2Na ¾¾¾¾o®
			3		300-400  C
III) 8NH 3 + 3Cl2  ®					D
			IV) 2Pb (NO3 )2 ¾¾®
1) I & II only			2) II , III & IV only3) I,II & III only		4) All of these

3.                  The correct order of reducing ablilities of hydrides of V group elements is

1)	NH3	< PH 3	< AsH3	< SbH3	< BiH3	2)	NH3  > PH3  > AsH3  > SbH3  > BiH3
3)	NH3	< PH3	> AsH3	> SbH3	> BiH3	4)	SbH3  > BiH 3  > AsH 3 > NH3  > PH3

4.                  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

5.                  Which is in the decreasing order of boiling points of V group hydrides?

	1) NH 3 > PH3	> AsH3	> SbH3		2) SbH3	> AsH3 > PH 3 > NH 3
	3) PH 3 > NH3	> AsH3	>SbH3		4) SbH3	> NH3	> AsH3  > PH3
6.	The following are some statements related to VA group hydrides.
	I. Reducting property increases from NH3			to BiH3
	II. Tendency to donate lone pair decreases from				NH3  to BiH3
	III. Thermal stability of hydrides decreases from				NH3  to BiH3
	IV. Bond angle of hydrides decreases from			NH3  to BiH3
	The correct statements are of
	1) I, II, III and IV		2) I, III and IV		3) I, II and IV		4) I and IV

7.                  Hydrolysis of NCl₃  gives NH₃  and X. Which of the following is X ?

	1) HClO	2) HClO			3) HOCl	4) HClO
	4			2		2
8.	Which of the following is not correct?
	(1) Ammonia is used as refrigerant.
	(2) A mixture of Ca (CN )2  and C is known as nitrolim.
	(3) A mixture of Ca (H 2 PO4 )		2	and CaSO .2H O is known as super phosphate of lime.
				4	2
	(4) Hydrolysis of NCl3	gives NH 3  and HOCl
9.	Which of the following is not correct?
	(1) Hydrolysis of NCl3	gives NH 3  and HOCl			(2) NH 3	is less stable than PH3

(3)    NH ₃  is a weak reducing reagent compared to PH₃

(4)  Nitric oxide is solid state exhibits diamagnetic properties.