Chemistry
Grade-9
Easy
Question
12 g of alkaline earth metal gives 14.8g of its nitride. Atomic weight of metal is:
- 20 g
- 30 g
- 40 g
- 50 g
Hint:
Mass of metal nitride is (3m+28)g.
The correct answer is: 40 g
3M + N2 
M3N2
Let the mass of metal be 'm'.
Mass of metal nitride is (3m+28)g
Now, (3m+28)
3m = 14.812 
m= 40
Atomic weight of metal is 40g
Related Questions to study
Chemistry
3gm of an impure sample of sodium sulfate dissolved in water was treated with an excess of BaCl2 solution when 1.74g of BaSO4 were obtained as dry precipitate. Calculate the percentage purity of the sample.
3gm of an impure sample of sodium sulfate dissolved in water was treated with an excess of BaCl2 solution when 1.74g of BaSO4 were obtained as dry precipitate. Calculate the percentage purity of the sample.
ChemistryGrade-9
Chemistry
____________ is used to represent the chemical reaction by using a formula.
____________ is used to represent the chemical reaction by using a formula.
ChemistryGrade-9
Chemistry
Weight of ethane which occupies the same volume of STP as 9.6g of methane is:
Weight of ethane which occupies the same volume of STP as 9.6g of methane is:
ChemistryGrade-9
Chemistry
18.4g of mixture CaCO3 and MgCO3 on heating gives 4.0g of magnesium oxide. The volume of carbon dioxide produced at STP in this process is:
18.4g of mixture CaCO3 and MgCO3 on heating gives 4.0g of magnesium oxide. The volume of carbon dioxide produced at STP in this process is:
ChemistryGrade-9
Chemistry
The mass of 112cm3 of NH3 gas at STP is:
The mass of 112cm3 of NH3 gas at STP is:
ChemistryGrade-9
Chemistry
The volume of Hydrogen liberated at 270C and 760mm of Hg pressure by treating 1.2g of magnesium with excess of hydrochloric acid is:
The volume of Hydrogen liberated at 270C and 760mm of Hg pressure by treating 1.2g of magnesium with excess of hydrochloric acid is:
ChemistryGrade-9
Chemistry
The quantity of Copper (II) oxide reacts with 2.80L of hydrogen at NTP is
The quantity of Copper (II) oxide reacts with 2.80L of hydrogen at NTP is
ChemistryGrade-9
Chemistry
The mass of carbon dioxide obtained when 2gm of pure limestone is heated:
The mass of carbon dioxide obtained when 2gm of pure limestone is heated:
ChemistryGrade-9
Chemistry
The mass of carbon dioxide that can be prepared by treating 100g of limestone with HCl is
The mass of carbon dioxide that can be prepared by treating 100g of limestone with HCl is
ChemistryGrade-9
Chemistry
The mass of CaO that can be prepared by heating 200kg of limestone which is 95% pure is:
The mass of CaO that can be prepared by heating 200kg of limestone which is 95% pure is:
ChemistryGrade-9
Chemistry
What is the relationship between the empirical formula and molecular formula?
What is the relationship between the empirical formula and molecular formula?
ChemistryGrade-9
Chemistry
What is the simplest ration of sodium, carbon and oxygen if it has the percentage of 43.4, 11.3 and 45.3 respectively?
What is the simplest ration of sodium, carbon and oxygen if it has the percentage of 43.4, 11.3 and 45.3 respectively?
ChemistryGrade-9
Chemistry
____________ is the mass of one mole of a molecular compound which is measured in grams.
____________ is the mass of one mole of a molecular compound which is measured in grams.
ChemistryGrade-9
Chemistry
The atomic mass of two isotopes are 85 and 87, with relative abundance of 75% and 25 % respectively. What is the average atomic mass?
The atomic mass of two isotopes are 85 and 87, with relative abundance of 75% and 25 % respectively. What is the average atomic mass?
ChemistryGrade-9
