Q.1
The electronegativity of the following elements increases in the order .. [ IIT 1987]
  • a) C, N, Si, P
  • b) N, Si, C, P
  • c) Si, P, C, N
  • d) P, Si, N, C
Q.2
Hydrolysis of NCl3 gives NH3 and X, Which of the following is X?[AFMC 2008]
  • a) HClO4
  • b) HClO3
  • c) HOCl
  • d) HClO2
Q.3
The brown ring test for nitrates depends on [AFMC 2008]
  • a) the reduction of nitrate to nitric oxide
  • b) oxidation of nitric oxide to nitrogen dioxide
  • c) reduction of ferrous sulphate to iron
  • d) oxidising action of sulphuric acid
Q.4
Which acid has P - P linkage? [AFMC 2009]
  • a) Hypophosphoric acid
  • b) Pyrophosphoric acid
  • c) Metaphosphoric acid
  • d) Orthophosphoric acid
Q.5
Which of the following element occurs free in nature? [ CPMT 1988]
  • a)N
  • b) P
  • c) As
  • d) Sb
Q.6
hich of the following element shows oxidation state + 1 to + 5 in its oxide? [2010]
  • a) N
  • b) P
  • c) As
  • d) F
Q.7
PbO2 on reaction with cone. HNO3 gives [2010]
  • a) PbNO2 + O2
  • b) Pb(N03)2 + H2O+ ½(O2 )
  • c) Pb+N2+H2O
  • d) Pb(OH)2 + NO
Q.8
Urea is preferred to ammonium sulphate as a nitrogenous fertilizer because: [2010]
  • a) it is more soluble in water
  • b) it is cheaper than ammonium sulphate
  • c) it is quite stable
  • d) it does not cause acidity in the soil
Q.9
In nitrogen family, the H-M-H bond angle in the hydrides gradually becomes closer to 90째 on going from N to Sb. This shows that gradually [2011]
  • a) The basic strength of the hydrides increases
  • b) Almost pure p-orbitals are used for M-H bonding
  • c) The bond energies of H-M-H bonds increase
  • d) The bond pairs of electrons become nearer to the central atom.
Q.10
Phosphorus is manufactured by heating in a furnace
  • a) Bone ash, sodium chloride and coke
  • b) Bone ash, silica and coke
  • c) Bone ash, silica and lime
  • d) Bone ash, coke and lime stone
Q.11
Which of the following does not belong to p-block element ( GUJCET 2008)
  • a) Sr
  • b) Po
  • c) As
  • d) Ga
Q.12
The most stable hydride is .. [EAMCET 1988]
  • a) NH3
  • b) PH3
  • c) AsH3
  • d) SbH3
Q.13
Phosphorus pentaoxide is widely used as ( GUJCET 2010)
  • a) reducing agent
  • b) oxidizing agent
  • c) dehydrating agent
  • d) bleaching agent
Q.14
Given are H3PO3, H3PO4, H4P2O6, and H4P2O Which of the above oxoacids results into three series of salts Explanation is provided, please click on
  • a )H4P2O7
  • b) H3PO4
  • c) H3PO3
  • d) H3PO3
Q.15
Producer gas is a mixture of [AIIMS 1998, 2000]
  • a) CO + H2
  • b) H2 + CH4
  • c)CO +N2
  • d) CO +H2O
Q.16
Nitrogen dioxide [ Karnatak CET 1989]
  • a) Dissolves in water forming HNO3
  • b) Does not dissolve in water
  • c) Dissolves in water to form HNO2 and gives off O2
  • d) Dissolves in water to form a mixture of nitrous and nitric acid
Q.17
The stability of hydrides follows the order [ Punjab CET 1996 ]
  • a) NH3 > PH3 AsH3 > SbH3
  • b) NH3 < PH3 < SbH3 < AsH3
  • c) PH3 > NH3 > AsH3 > SbH3
  • d) AsH3 > NH3 > PH3 > SbH3
Q.18
When AgNO3 is heated strongly the products formed are [ Roorkee 1990]
  • a) No and NO2
  • b) NO2 and O2
  • c) NO2 and N2O
  • d) NO and O2
Q.19
In the manufacture of ammonia by Heber's process, which of the following is unfavourable? [ KCET 2004 ]
  • a) Increasing the temperature
  • b) Increasing the pressure
  • c) Reducing the temperature
  • d) Removing ammonia as it is formed
Q.20
Ammonia compound which on heating does not give NH3 [ Roorkee 1993]
  • a) (NH4)2SO4
  • b) (NH4)2CO3
  • c) NH4NO2
  • d) NH4Cl
Q.21
Which of the following is metaphosphoric acid? [ J and K CET 2002]
  • a) H3P3O9
  • b) H5P3O10
  • c) H9P2O7
  • d) H3PO4
Q.22
Among the trihalides of nitrogen which one is most basic? [ Punjab CET 1997]
  • a) NF3
  • b) NCl3
  • c) NI3
  • d) NBr3
Q.23
N forms NCl3 whereas P can form PCl3 and PCl5 why? [ Orissa JEE 2004]
  • a) P has low lying 3d-orbitals, which can be used for bonding but N does not have 3d-orbitals in its valance shell
  • b) N atoms is larger than P in size
  • c) P is more reactive towards Cl than N
  • d) None of these
Q.24
The number of hydroxyl group in pyrophosphoric acid is [ KCET 1993]
  • a) 3
  • b) 4
  • c) 5
  • d) 7
Q.25
When a vapour, at atmospheric pressure was gradually heated from 25°C its colour was found to deepen at first and then to fade as the temperature was raised above 160°C. At 600°C , the vapour was almost colourless, but its colour deepens when the pressure was raised at this temperature. the vapour was
  • a) The bromine
  • b) A mixture of nitrogen dioxide and dinitrogen tetraoxide
  • c) Pure nitrogen dioxide
  • d) Pure dinitrogen tetraoxide
Q.26
When NH3 is passed over heated CuO, it is oxidized to [ Roorkee 1992]
  • a) N2
  • b) NO2
  • c) HNO2
  • d) N2O
Q.27
Which of the following oxide of nitrogen is a coloured gas [ IIT 1987 ]
  • a) N2O
  • b) NO
  • c) N2O4
  • d) NO2
Q.28
The bond present in N2O5 are [ IIT 1986]
  • a) Only ionic
  • b) Covalent and coordinate
  • c) Only covalent
  • d) Covalent ionic
Q.29
P4O10 is not used to dry NH3 gas because [ KCET 2001]
  • a) P4O10 reacts with moisture in NH3
  • b) P4O10 is not a drying agent
  • c) P4O10 is acidic and NH3 is basic
  • d) P4O10 is basic and NH3 is acidic
Q.30
Which of the following is paramagnetic? [ MPCET 1990]
  • a) NO
  • b) N2O4
  • c) P4O6
  • d) N2O5
0 h : 0 m : 1 s