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Inorganic Chemistry
sneha's Avatar
sneha
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2 Apr 2009 22:31:32 IST
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s block elements
None

Hello to everyone. I am starting this thread for questions from s block elements. I will post one question at a time and when it gets answered correctly, I will post another.

so, here is my first question

1. The pair of compounds which cannot exist together in a solution is

(A) NaHCO3 & NaOH                            (B) Na2CO3 & NaOH

(C) NaHCO3 &   Na2CO3                    (D) NaHCO3 & H2O


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KRITI JOHARI's Avatar

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2 Apr 2009 22:39:34 IST
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ANS -C
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2 Apr 2009 22:40:54 IST
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no your ans is not correct
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2 Apr 2009 22:58:07 IST
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ans-b
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2 Apr 2009 23:04:27 IST
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yes. here is another question

2. EDTA is used in the estimation of

(A) Mg+2                        (B) Ca+2

(C) both Ca+2 & Mg+2             (D) Neither Mg+2 nor Ca+2
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KRITI JOHARI
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2 Apr 2009 23:16:38 IST
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ans-c

 
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3 Apr 2009 11:53:47 IST
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yes.

3.The alkaline earth metals, which do not impart any colour to the bunsen flame is

(A) Be & Mg                           (B) Mg & Ca

(C) Be & Ca                           (D) Be & Ba
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Sahithya's Avatar

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3 Apr 2009 11:58:01 IST
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ans-A
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3 Apr 2009 11:58:18 IST
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c ?
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saharsha kumar keshkar's Avatar

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3 Apr 2009 11:59:18 IST
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option (a) i.e Be and Mg

 
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3 Apr 2009 11:59:22 IST
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(A) Be and Mg~~ high ionisation energy
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3 Apr 2009 12:05:25 IST
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Let me post one ques....

q: A solution of sodium  in  liq ammonia  is strongly reducing due to the presence of..

a) Na atoms

b) NaH

c)sodium amide

d) solvated electrons
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sagar panda's Avatar

sagar panda
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3 Apr 2009 12:13:02 IST
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is it (d)
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3 Apr 2009 12:18:04 IST
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ans of my que is a. and ans of saharsh's question is d.
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saharsha kumar keshkar
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3 Apr 2009 12:18:31 IST
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yes it is .(d)

next...

asser. and reason...

A: Alkali metals do not occur in native state.

R:Alkali metals are highly reactive metals..

easy one!
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3 Apr 2009 12:20:32 IST
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both correct correct explaanation~
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3 Apr 2009 12:20:40 IST
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The golden yellow colour associated with NaCl to bunsen flame can be explained on the basis of

(A) low I.E. of sodium         (B) emission spectrum

(C) photosensitivity of sodium     (D) sublimition of metallic sodium of yellow vapours
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3 Apr 2009 12:23:16 IST
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(B) emission spectrum of Na consists of two wavelengths which are yellow
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3 Apr 2009 12:24:24 IST
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B)
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3 Apr 2009 12:25:39 IST
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a) due to ionization energies are low, the valence electrons in their atoms can be easily excited to higher but unstable energy state, by the flame of a bunsen burner

 
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