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What is the chemical formula for the compound calcium hydroxide?

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Important Questions on Atoms and Molecules

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Find the empirical formula and the molecular formula of an organic compound from the data given below:

C = 75.92%,  H = 6.32%  and  N = 17.76%

The vapour density of the compound is 39.5.  [C = 12,  H = 1,  N = 14]

MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
In a compound C, H and N are present in 9:1:3.5 by weight. If molecular weight of compound is 108, the molecular formula of compound is
EASY
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Molecular formula of a compound is C6H18O3. Find its empirical formula.
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Write chemical formula of Magnesium Chloride.
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
An element ‘P’ which belongs to 13th group of the periodic table and another element ‘Q’ belongs to 16th group. The formula of the compound formed if they react with each other is:
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
If the vapour density of the carbon containing gaseous substance is 13, which of the following is its molecular formula?
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
An organic compound contains 60%C; 4.48%H and 35.5% O. Its empirical formula is
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The molecular formula of chloride of a metal M is MCl2. The molecular formula of an oxide of M will be:
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The element ‘X’ has an electronic configuration 2,8,3. Element ‘Y’ has an electronic configuration 2,8 7. The chemical formula of the compound formed when they react is
HARD
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The ratio of mass percent of C and H of an organic compound CXHYOZ is 6 : 1. If one molecule of the above compound CXHYOZ contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of the compound CXHYOZ is
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The empirical formula and molecular mass of a compound are CH2O and 180 g respectively. The molecular formula of the compound will be
MEDIUM
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
An element X with atomic number 13 combines with another element Y of atomic number 17. The formula of the compound formed and the nature of the bond will be:
HARD
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The formulae of an oxide of an element M is MO. The formulae of its phosphate is
EASY
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

A solution of a substance 'X' is used for whitewashing.

(a) Name the substance 'X' and write its formula.

(b) Write the reaction of the substance with water.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Write the valencies and chemical formula of Sodium nitrate.
EASY
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Write the chemical name of KClO.
HARD
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Write the formulae for the following and calculate the molecular mass for each one of them.
(A) Caustic potash 
(B) Baking powder 
(C) Limestone
(D) Caustic soda 
(E) Ethanol
(F) Common salt
EASY
Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
The formula of sodium nitride is
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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
CaCl2 is :
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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae
Write the chemical name of Na2PbO2.