If an element X belongs to II group and another element Y belongs to VII group then the compound formed between these elements has fomula :
A) XY
B) X2Y
C) X Y2
D) X2 Y3
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38. Consider three sets \( X, Y \) and \( Z \) having 6,5 and 4 elements respectively. A.11 these 15 elements are distinct. Let \( S=(X-Y) \cup Z \). How many proper subsets does \( S \) have? (a) 255 (b) 256 (c) 1023 (d) 1024
Given : n(X)=6 n(y)=5 n(z)=4 Also,the elements are distinct Therefore,these three are disjoint sets ==>n(X∩Z) =0 -------- (1) Now,her S=(X-Y)∪Z=X∪Z [Because X∩Z=∅==>X-Z=X] ==>n(S)=n(X∪Z) ==>n(S)=n(X)+n(Z)-n(X∩Z) ==>n(S)=n(X)+n(Z)-0 [From (1)] ==>n(S)=6+4=10 Therefore, Number of proper subsets of S=2n(S)-1 ...
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One side of an equilateral triangle is 36 cm. The mid-points of its sides are joined to form another triangle. Again another triangle is formed by joi
Correct Answer - `432sqrt3 cm^(2)`
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The valency of an element which belongs to 3rd period and 2nd group of periodic table is
Correct option is A) 2
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An element “X forms an ionic compound with another element Y. Then the charge on the ion formed by X is ……………..
Correct option is A) +1
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Generally the chemical bond formed between IA and VII A group elements …………….
A) Electrovalent bond
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If valency of Mg is ‘+2’ and valency of Sulphate (SO4) is ‘-2’, then the formula of compound formed by these
Correct option is A) Mg2 SO4
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Why elements of group 1 and group 2 are known as s-block elements?
The subshell in which the last electron enters decides the block to which an element belongs. In group 1 and group 2 elements, the last electron is filled in the s...
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Which of the following forms a bridge between reactive s-block elements and less reactive group 13 and 14 elements?
Correct option is: (B) Transition metals The bridge between s-block element and group 13 and 14 elements are transition metal (d-block elements)
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Which of the following forms a bridge between reactive s-block elements and less reactive group 13 and 14 elements?
2 Answers
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State the trends in the following properties of group 1 and group 2 elements down a group.
Sr. no. Property Down a group i Atomic radii Increases ii Ionic radii Increases iii Ionization enthalpy Decreases iv Electronegativity Decreases v Standard reduction potential Decreases
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