IMPORTANT SELECTED MODEL QUESTION FOR NEET

IMPORTANT SELECTED MODEL QUESTION FOR NEET

• Google Drive 
• Slide Share

ANSWER

Q1Ans (c) Because of energized electrons moving to the other end

Q2Ans(d) Is known as fuel cell.

Q3Ans (a) (ii) and (iv) are correct realations

Q4Ans (b) Obtained product is Oxygen.

Q5. Ans (d) Q6.D

Q7.Ans (a) strong electrolytes are completely ionized at all concentrations. On increasing dilution the no. of ions remains same but the ionic mobility and equivalent conduction increases.

Q10. Ans (a) Enzymes act like catalyst in biochemical reactions. Presence of an enzyme increases the rate of reaction by lowering the activation energy of the reactant.

Q11.Ans (d) A catalyst affects equally for both forward and backward reactions. So it does not affect equilibrium constant of reaction.

Q12.d

Q13. Ans (d) Rate = k[A]2[B]3

When concentrations of both A and B are doubled then

Rate =k[2A]2[2B]3=32k [A]2[B]3[22 x23=32]

So, rate will increase by a factor of 32.

Q14.a Q15.a Q16.c

Q17.Ans (b) Condensation method is used for destruction.

Q18.Ans (c) Adopt the ability of variable oxidation energy.

Q19.Ans (a) Fog is colloidal solution of liquid in gas.

Q20.d

Q21. Ans.(a) Langmuir adsorption isotherm is based on the assumption that every adsorption site is equivalent and whether sites are not occupied or occupied the ability of a particle to bind is independent.

Q22.d

Q23. Ans(d)Magnetitie (Fe2O3) is a mineral of iron.

Q24.d

Q25. Ans (c) Hypo is used in photography to remove under composed silver Bromide as soluble complex.

Q26.Ans (a) Magnesium and manganese are the metals that produce hydrogen with dilute nitric acid because they are electropositive in nature

Mg +2HNO3------ Mg(NO3)2 +H2

Q27Ans (b) d-orbitals are available for bonding is not correct for nitrogen.

Q28.b

Q29. Ans (c) Strongest hydrogen bonding is shown by Hydrogen Fluoride

Q30. Ans (c) As halogens have seven electrons (ns2np2) in the valence shell, they have a strong tendency to acquire the nearest inert gas configuration by gaining an electron from the metallic atom and form halide ions easily.

Q31. (a) Hydrogen iodide has the liberate bromine.

Q32. Ans (a) NF5 does not exist because the size of nitrogen atom is very small

Q33. Ans (b) Brown ring test is used to detect nitrate.

Q34.d Q35.c

Q36 Ans (a) Ozone can only combine with hydrogen atoms.

Q37.d Q38.d Q39.a

Q40. Ans (b) CIF3 molecules all bond are not equal.

Q41.Ans (d) F2 is strongest oxidizing agent.

Q42. Ans (b) Order of acidic strength in strong acid are HCIO4 > H2SO4 > HCIO3 >H2SO3

Q43. Ans (a) SF4 is a polar molecule.

Q44. Ans (b) PCl3 +3H2O-----H3PO3+ 3HCl

Q45. Ans (a) phosphorus pentoxide has great affinity for water. It forms ortho phosphoric acid on absorbing water.

P4O10 +6H2O------- 4H3PO4

It is used as a powerful dehydrating or drying agent.

Q46. Ans (c) H3PO2 is named as hypophosphorus acid. As it contains only one P ---OH group, so its basicity is one

Q47. Ans (a) Due to absence of reaction between marble and bromine

Q48. Ans (b)Fluorine is more reactive than chlorine. So bond energy of chlorine is greater than fluorine.

Q49.b

Q50. Ans (c) By use of the joule-Thomson effect air is liquefied (cooling by expansion of the gas). Water vapour and CO2 are removed by solidification. The remaing constituents of liquid air (liquid oxygen and liquid nitrogen ) are seprated by means of fractional distillation (b.p of O2 = - 1830C :b.p of N2= -195.80C)

Q51.a Q52.c

Q53. Ans (b) Acidic strength increases as the oxidation number of central atom increases

Q54. Ans (d) Ionic radii of trivalent lanthanides steadily increases with increase in atomic number

Q55.Ans (c)A layer of oxide is formed on the surface of nickel, which protects nickel, below it and iron underneath it.

Q56.Ans (d) Oxidation states shown by elements are as follows:

La = +3

Eu and Gd = +2 and +3

Am = +2 +3 +4 +5 and +6

Due to its longer size and low ionization energy am shows maximum number of different ixidation state.

Q57. Ans (a) Interstitial compounds are obtained when small atoms like H,B,C,N etc. fit into the interstitial space of lattice metals. These retain metallic conductivity. These resemble the parent metal in chemical properties like hardness, Ans (b)Minimum energy gap between 5f, 6d and 7s subshell. That’s why e- excitation will be easier.melting point etc.

Q58. Ans (b)Minimum energy gap between 5f, 6d and 7s subshell. That’s why e- excitation will be easier.

Q59.Ans (b) As a result lanthanide contraction, the atomic radii of element of 4d and 5d come closer, so the properties of 4d and 5d transition element shows the similarities. The regular decrease in the radii of lanthanide ions from La3+ to Lu3+ is known as lanthanides contraction.

It is due to greater effect of the increased nuclear charge than that of screening effect (shielding effect).

Q60. Ans (d

Q61. Ans (c) The 5f –orbitals extend into space beyond the 6s and 6p-orbitals and participate in bonding. This is in direct contrast to the lanthanides where the 4f-orbitals are buried

deep inside in the atom, totally shielded by outer orbitals and thus unable to take part in bonding.

Q62 Ans (c) A transition element must have incomplete d-subshell. Zinc have completely filled d-subshell having 3d10 configuration . so do not show properties of transition elements to any appreciable extent except for their ability to form complexes.

Q63.b Q64.a Q65.(b) Q66.(a) Q67(b)

Q68 Ans (a) Primary alcohol undergoes catalytic dehydrogenation to give aldehyde.

Q69. Ans (c) Formation of a yellow precipitate on heating a compound with an alkaline solution of iodine is known as “iodoform reaction”.

alcohols which posses CH3CH(OH)--- group.

As: C2H3OH +4l2 +NaOH------CHl3+ Nal + HCOONa +H2O

Methyl alcohol does not respond to this test. Idoform test is exhibited by ethyl alcohol, acetaldehyde, acetone, methyl ketones and those

Q70Ans Ans (d) Dihydrogen sodium phosphate (NaH2PO4) does not have a lone pair of electrons on the P-atom. As such it can not act as a nucleophile and does not react with aldehydes and ketones.