List of practice Questions

When but-1-yne is treated with excess of HBr, the expected product is
When an ideal gas is compressed adiabatically, its temperature rises the molecules on the average have more kinetic energy than before. The kinetic energy increases
When an oak tree is kept in a poisonous solution, water rises to the top of the tree, although the tree is ready to take another supply of poisonous solution followed by uptake of even pure water. This shows that
When aqueous solution of $ {Na_2S}$ is titrated with dilute and acidified $ {KMnO_4}$ solution, $Na_2S0_3$ is formed. In this reaction, moles of $ {KMnO_4}$ reduced per mole of $ {Na_2S}$ is
When ammonium chloride is dissolved in water, the solution becomes cold. The change is
When an ac voltage of $220\,V$ is applied to the capacitor $C$, then
When an article is bleached by $SO_2$, the colour can be restored by
When an explosive shell travelling in a parabolic path under the effect of gravity explodes in the mid air, the centre of mass of the fragments will move
When ammonia and sodium hypochlorite are allowed to react,which nitrogen compound is formed ?
When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals. Which of the following observations regarding the reaction are correct ? (i) Dilute solutions are bright blue in colour due to solvated electrons. (ii) These solutions decompose to form amides and hydrogen. (iii) From this solution the ammoniates $[M(NH_3)_6]^{2+}$ can be recovered by evaporation.
When acetylene is treated with HBr, the product is
When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salts, then $Sn^{2+}$ changes to
When $AgNO_3$ is heated strongly the products formed are
When alkyl aryl ether is heated with HI, it gives
When a thermometer is taken from the melting ice to a warm liquid, the mercury level rises to $\frac{2^{th}}{5}$ of the distance between the lower and the upper fixed points. The temperature of liquid in $K$ is
When a voltage measuring device is connected to ac mains, the meter shows the steady input voltage of $220\,V$. This means
When accessory whorls (calyx and corolla) are absent in a flower, it is called
When a solid melts there is
When a speeding bus stops suddenly, passengers are thrown forward from their seats because
When a sphere is taken to bottom of sea 1 km deep, it contracts by 0.01%. The bulk modulus of elasticity of the material of sphere is (Given, density of water $= 1 gcm^{-3})$
When a plant undergoes senescence, the nutrients may be
When a plasmolysed cell is placed in water or hypotonic solution, what happens?
When a positively charged particle enters a uniform magnetic field with uniform velocity its trajectory can be a) straight line b)a circle c) a helix
When a ring is rolling $V_1, V_2, V_3, V_4$ are velocities of top most point, lowest point, end point of horizontal diameter, center of ring respectively. The decreasing order of these velocities is
When a mixture of air and steam is passed over red hot coke, the outgoing gas is