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Subject: Chemistry, asked on 14/1/18

Q Name the following:
(a) An alkali metal in period 3 and halogen in period 2. 
(b) The noble gas with 3 shells. 
(c) The non-metals present in period 2 and metals in period 3. 
(d) The element of period 3 with valency 4. 
(e) The element in period 3 which does not form oxide. 
(f) The element of lower nuclear charge out of Be and Mg. 
(g) Which has higher E.A., Fluorine or Neon. 
(h) Which has maximum metallic character Na, Li or K.

Subject: Chemistry, asked on 26/9/18

state the correct answer
1)the metallic compound, reduced to the metal by electrolysis is:
A) iron (lll) oxide
B) Copper oxide
C) magnesium oxide
D) Silver oxide
2) hydrolysis of salts from acidic basic or neutral solution the salt which on hydrolysis from neutral solution is
A) Ammonium Chloride
B) sodium chloride
C) magnesium chloride
D) potassium chloride
3) organic compound having a double carbon- carbon covalent compound is
A) C3H8
B) C3H6
C) C3H4
D) CRH10
4) the element arranged in correct increasing order of electron affinity in a period of periodic table are
A) nitrogen, carbon, Boron
B) Boron, billion, Lithium
C) carbon, oxygen, fluorine
D) oxygen, nitrogen, carbon
5) during electrolysis
A) cations accept electron from anion
B) anions accept electron from cathode
C) anion loses electron to the anode
D) cations donate electrons to anode

Subject: Chemistry, asked on 14/1/18

No 3 help me

Subject: Chemistry, asked on 14/1/18

Is barium a metal or non metal

Subject: Chemistry, asked on 9/1/18

why valency is always positive?
 

Subject: Chemistry, asked on 2/7/18

1. Arrange the following as per the instruction given 
in the brackets • 
(i) Be, F, Li, O, C (decreasing order of atomic size). 
(ii) cs, Na, Li, K, Rb (increasing order of metallic character)
(iii) Na, K, Cl, S, Si (increasing order of ionization energy). 
(iv) Cl, F, Br, I ( increasing order of electron affinity). 

2. Compare the compounds Carbon tetrachloride and sodium chloride with regard to solubility in water and
electrical conductivity.

Subject: Chemistry, asked on 21/4/18

State the important salient features of the modern periodic table.State how separation of elements and periodicity of elements forms an important feature of the modern periodic table.

Subject: Chemistry, asked on 18/3/18

solution please

Subject: Chemistry, asked on 14/5/18

An unbalanced chemical equation is no equation. Explain the statement

Subject: Chemistry, asked on 21/1/18

Solve this:

Subject: Chemistry, asked on 22/5/18

An element has 2 electrons in its N shell ? What is its atomic number and is it a metal or nonmetal ?

Subject: Chemistry, asked on 22/3/19

Why is I.E of 3s1 less than 3p1 even if penetration effect on s subshell is more than p subshell

Subject: Chemistry, asked on 14/1/18

Help no 4

Q4. Arrange the following as per instructions given in the brackets.

     (a) Mg, Cl, Na, S, Si (increasing order of atomic size)

     (b) K, Na, Cl, S, Si (increasing non-metallic character))

     (c) Na, K, Cl, S, Si (increasing ionisation potential) 

     (d) Cl, F, Br, I (increasing electron affinity )

     (e) Cs, Na, Li, K, Rb (decreasing electronegativity )
 

Subject: Chemistry, asked on 28/6/19

Please help me with this problem!!

If n = 5, then correct sequence for filling of electrons in the orbitals will be
(1) ns → np → (n – 1)d → (n − 1)f
(2) np → (n + 1)s → (n – 1)f → nd
(3) ns → np → (n + 1)d → (n – 1)f -
(4) np → nd → (n + 1)s → (n – 1)f

Subject: Chemistry, asked on 21/4/18

State reason why
A) completion of each period is logical
B) period 2 elements are called bridge elements
NO LINK PLZZ

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