NEET Chemistry MCQs

A projectile is launched with an initial velocity $u$ at an angle $heta$ to the horizontal. At the highest point of its trajectory, a small explosion separates it into two equal masses. One mass falls vertically downwards. If the range of the original projectile would have been $R$, what is the horizontal distance between the two fragments when they land?

A projectile is launched at an angle $heta$ with initial speed $u$. At its highest point, it explodes into two identical fragments. One fragment moves vertically upwards with speed $v$ immediately after the explosion. What is the speed of the other fragment immediately after the explosion?

A particle is projected at an angle $\alpha$ to the horizontal. At what angle $\beta$ with the horizontal should another particle be projected with the same speed such that both have the same range?

A projectile is launched with initial speed $u$ at an angle $heta$ from the horizontal. At the highest point, it explodes into three fragments of equal mass. One fragment falls vertically downwards, the second fragment continues along the original path with speed $v$. Find the speed of the third fragment immediately after the explosion.

Two projectiles are launched from the same point with the same speed $u$. One is launched at an angle $heta$ and the other at $(90^\circ - heta)$ with the horizontal. What is the minimum distance between these two projectiles during their flight?

A mixture of $KClO_3$ and $KCl$ weighing 4.96 g was heated to produce $O_2$. The evolved oxygen occupied 448 mL at STP. What percent of the original mixture was $KClO_3$?

10 g of a mixture of $NaHCO_3$ and $Na_2CO_3$ has 1.68 g of $NaHCO_3$. On heating, if the residue weighs 8.28 g, what is the percentage purity of $Na_2CO_3$ in the mixture?

A 2.00 g sample of a mixture of $CaCO_3$ and $CaSO_4\cdot2H_2O$ was heated to a constant mass of 1.55 g. What percent by mass of the original sample was $CaCO_3$?

A 1.00 g sample containing $BaCl_2\cdot2H_2O$ is heated to a constant mass of 0.835 g. What was the mass percent of barium in the original sample?

25 mL of a mixture of $NaOH$ and $Na_2CO_3$ solution requires 20 mL of 0.5 N $HCl$ using phenolphthalein as an indicator. Another 25 mL of the same mixture requires 30 mL of the same $HCl$ solution when methyl orange is used as an indicator. Calculate the ratio of normalities of $NaOH$ and $Na_2CO_3$ in the mixture.