Chemistry
Fill in the blanks from the choices given in brackets:
(i) The polar covalent compound in gaseous state that does not conduct electricity is ……………
(carbon tetra chloride, ammonia, methane)
(ii) A salt prepared by displacement reaction is ……………
(ferric chloride, ferrous chloride, silver chloride)
(iii) The number of moles in 11gm of nitrogen gas is ……………
(0.39, 0.49, 0.29) [atomic mass of N=14]
(iv) An alkali which completely dissociates into ions is ……………
(ammonium hydroxide, calcium hydroxide, lithium hydroxide)
(v) An alloy used to make statues is ……………
(bronze, brass, fuse metal)
Acids Bases Salts
ICSE 2020
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Answer
(i) The polar covalent compound in gaseous state that does not conduct electricity is ammonia
(ii) A salt prepared by displacement reaction is Ferrous chloride
(iii) The number of moles in 11gm of nitrogen gas is 0.39
Gram molecular mass of nitrogen gas (N2) = 2(14) = 28
28 g of nitrogen gas = 1 mole
∴ 11 g of nitrogen gas = x 11 = 0.39
(iv) An alkali which completely dissociates into ions is lithium hydroxide
(v) An alloy used to make statues is bronze
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Related Questions
Calculate:
(i) The amount of each reactant required to produce 750 ml of carbon dioxide, when two volumes of carbon monoxide combine with one volume of oxygen to produce two volumes of carbon dioxide.
2CO + O2 ⟶ 2CO2
(ii) The volume occupied by 80 g of carbon dioxide at STP.
(iii) Calculate the number of molecules in 4.4 gm of CO2.
[Atomic mass of C= 12, O=16]
(iv) State the law associated in question no. (f)(i) above.
Give one word or a phrase for the following statements:
(i) The chemical bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
(ii) Electrode used as cathode in electrorefining of impure copper.
(iii) The substance prepared by adding other metals to a base metal in appropriate proportions to obtain certain desirable properties.
(iv) The tendency of an atom to attract electrons to itself when combined in a compound.
(v) The reaction in which carboxylic acid reacts with alcohol in the presence of conc. H2SO4 to form a substance having a fruity smell.
The following table represent the elements and the atomic number.
With reference to this, answer the following using only the alphabets given in the table.
Element Atomic number P 13 Q 7 R 10 (i) Which element combines with hydrogen to form a basic gas?
(ii) Which element has an electron affinity zero?
(iii) Name the element, which forms an ionic compound with chlorine.
Draw the electron dot diagram for the compounds given. Represent the electrons by [.] and [x] in the diagram.
[Ca=20, O=8, Cl=17, H=1]
(i) Calcium oxide
(ii) Chlorine molecule
(iii) Water molecule