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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 7
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Q.1
When K2O is added to water, the solution is basic because it contains a significant concentration of ...[ AIIMS 2001]
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a) O22-
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b) O3-
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c) OH-
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d) K+
Explanation
Answer: (c)
Q.2
The reactivity of the alkali metals sodium with water is made use of ? ..[M PMT 1994]
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a)In drying of alcohol
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b) In drying of ammonia solution
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c)In drying of Benzene
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d)As general drying agent
Explanation
Answer: (c)
Q.3
Which of the following statement is incorrect: [ AMU 1997]
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a) Aluminum is the most abundant metal in earth's crust
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b) Sodium is the most abundant metallic element in sea water
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c)Melting and boiling points of alkai metals decreases down the group
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d)Ionic character of alkali metal halides decreases down the group
Explanation
Answer: (d)
Q.4
When CO is passed over solid NaOH heat to 200°C , it forms ..[CBSE PMT 1998]
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a) Na2CO3
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b) H2CO3
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c)HCOONa
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d)All
Explanation
NaOH + Co → HCOONa ( sodium formate) Answer:(c)
Q.5
Which of the following has the highest conductivity? [ Haryana CEET 1999]
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a) Li+
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b) Cs+
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c) Na+
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d) K+
Explanation
Cs has highest mobility thus highest conductivity Answer: (b)
Q.6
A combustible gas is liberated when caustic soda solution is heated with ..[Raj. PMT 1994]
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a)S
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b) NH4Cl
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c)I2
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d)Zn
Explanation
Zn + NaOH → Na2ZnO2 + H2 ↑ Hydrogen is combustible gasAnswer: (d)
Q.7
Sodium nitrate decomposes above 800°C to give ..[IIT 1998]
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a) N2
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b) O2
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c)NO2
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d)Na2O
Explanation
2NaNO3 → 2NaNO2 + O2Answer: (b)
Q.8
On heating sodium metal in a current of dry ammonia, the compound formed is ...[KCET 2000]
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a) Sodium amide
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b) Sodium azide
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c)Sodium nitride
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d)Sodium hydride
Explanation
2Na + 2NH3 → 2NaNH2 + H2 Answer:(a)
Q.9
On dissolving moderate amount of sodium metal in liquid NH3 at low temperature, which of the following does not occur? .. [AIIMS 2003]
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a) Blue coloured solution is obtained
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b) Na+ ions are formed in the solution
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c) Liquid NH3 solution becomes good conductor of electricity
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d) Liquid NH3 solution remains diamagnetic
Explanation
On dissolving moderate amount of Na metal in liquid NH3, the solution is blue in colour and paramagnetic but not diamagnetic Answer: (c)
Q.10
Which of the following properties is not true for an alkali metal? [CPMT 1993]
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a)Low atomic volume
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b) Low ionization energy
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c)Low density
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d)Low electronegativity
Explanation
In any period alkali metals have lowest density ( except noble gas) , therefore alkali metals have large volumeAnswer: (a)
Q.11
Which of the following reacts with water at high rate? [ AFMC 1995]
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a) Li
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b) K
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c)Na
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d)Rb
Explanation
Ionization energy decreases in group from top to bottom, thus Rb have lowest ionization energy, so reacts with water at higher rateAnswer: (d)
Q.12
The electronic configuration of metal M is 1s2, 2s2, 2p6, 3sThe formula of its oxide would be ... [MP PMT 1998]
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a) MO
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b) M2O
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c)M2O3
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d)MO2
Explanation
Answer:(b)
Q.13
The alkali metal that reacts with nitrogen directly to form nitride is .. [ MP PMT 2000]
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a) Li
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b) Na
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c) K
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d) Kb
Explanation
6Li + N2 → 2Li3N Answer: (a)
Q.14
Which of the following is known as fusion mixture? [ CBSE PMT 1993]
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a)Mixture of Na2CO3 + NaHCO3
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b) Na2CO3 . 10H2O
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c)Mixture of K2CO3 + Na2CO3
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d)NaHCO3
Explanation
Answer: (c)
Q.15
Sodium is made by the electrolysis of molten mixture of about 40% NaCl and 60% CaCl2 because...[CBSE PMT 1995]
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a) CaCl2 helps in conduction of electricity
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b) This mixture has a lower melting point than NaCl
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c)Ca2+ can displace Na from NaCl
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d)Ca2+ can reduce NaCl to Na
Explanation
Answer: (b)
Q.16
The stability of the following alkali metal chlorides follows the order .. [MP PMT 1998]
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a) LiCl > KCl > NaCl > CsCl
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b) CsCl > KCl > NaCl > LiCl
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c)NaCl > KCl > LiCl > CsCl
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d)KCl > CsCl > NaCl > LiCl
Explanation
Stability depends on enthalpy of formation more the negative value of enthalpy of formation more stability Answer:(c)
Q.17
When sodium is treated with sufficient oxygen/air the product obtain is ...[AFMC 2002]
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a) Na2O
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b) Na2O2
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c) NaO2
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d) NaO
Explanation
Answer: (b)
0 h : 0 m : 1 s
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