Some Basic Concepts of Chemistry: NEET Chemistry Previous Year Questions

311 previous year questions from Some Basic Concepts of Chemistry. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. 1.How many moles of magnesium phosphate, $M{g}_3(P{O}_4{)}_2$ will contain 0.25 mole of oxygen atoms?
2. 2.An element, $X$ has the following isotopic composition: $200X$: 90% $199X$: 8.0% $202X$: 2.0% The weighted average atomic mass of the naturally occurring element…
3. 3.Which of the following is the most accurate measurement?
4. 4.The masses of carbondioxide and water (ing) respectively formed during complete combustion of $10g$ of glucose at STP are
5. 5.$10{\text{cm}}^3$ of $0.1N$ monobasic acid requires $15{\text{cm}}^3$ of sodium hydroxide solution whose normality is
6. 6.Temperature of ${25}^{\circ }C$ in Fahrenheit and Kelvin scale respectively are
7. 7.Which of the following have same number of significant figures? (A) 0.00253 (B) 1.0003 (C) 15.0 (D)163 Choose the correct answer from the options given below
8. 8.$100\text{mL}$ of $0.1M$ acetic acid is completely neutralized using a standard solution of $\text{NaOH}$. The volume of ethane obtained at STP after the comple…
9. 9.Which of the following is not a compound?
10. 10.The volume of 1 mole of any pure gas at standard temperature and pressure is always equal to
11. 11.The density of 2 M aqueous solution of NaOH is $1.28g/{\text{cm}}^3$. The molality of the solution is [Given that molecular mass of…
12. 12.The molarity of the solution containing 2.8% (mass / volume) solution of KOH is: (Given atomic mass of K = 39) is:
13. 13.Vapour density of a metal chloride is 83 . If equivalent weight of the metal is 6 , its atomic weight will be………….
14. 14.$0.4g$ of dihydrogen is made to react with $7.1g$ of dichlorine to form hydrogen chloride. The volume of hydrogen chloride formed at $273K$ and 1…
15. 15.Magnetite can be reduced with $\text{CO}$ to yield iron metal and carbon dioxide. Calculate the mass of magnetite (in $\text{kg}$ ) needed to obtain $4\text{kg}$ of ir…
16. 16.1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to
17. 17.What mass of $95\text{\%}$ pure ${\text{CaCO}}_3$ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction?…
18. 18.Excess of carbon dioxide is passed through $50\text{mL}$ of $0.5M$ calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryn…
19. 19.Amongst the following, identify the species with an atom in +6 oxidation state:
20. 20.In the final answer of the expression $\frac{(29.2-20.2)(1.79\times 10^5)}{1.37}$. The number of significant figures is
21. 21.$\text{xg}$ of methane was burnt completely in the presence of oxygen. The liberated gases were passed into a solution containing $370g$ of…
22. 22.The weight percentage of $C$ and $H$ in a hydrocarbon is in the ratio of $4\text{:}1$. What is its empirical formula?
23. 23.On complete combustion 1.0 g of an organic compound $\text{(}X\text{)}$ gave 1.46 g of ${\text{CO}}_2$ and 0.567 g of $H_{2}O$. The empirical formula mass of compo…
24. 24.Which one of the following pairs of compounds illustrates the law of multiple proportions?
25. 25.80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the…