Questions
If you are applying the process shown in the diagram to get pure silver from impure silver, how do you arrange the apparatus? Show by a suitable diagram.
The temperature of 600 g of certain metal is 100 $\rm ^\circ$C and it is placed in 1.5 litre water at 15 $\rm ^\circ$C. If both of them gain the temperature of 20 $\rm ^\circ$C. Calculate the specific heat capacity of the metal?
Peacock, Crocodile, Snake, Bat, Whale, Sea-horse
Which animal of above has three chambered heart? Classify one other animal that lies in the same class of the animal.
A survey of a rice field has found the problem of erosion due to excessive use of chemical fertilizers. How can it be controlled? Mention any two points.
Clarify the cause of selecting dil. HCl instead of dil. H$_2$SO$_4$ during laboratory preparation of carbon dioxide. What tests do you need to perform before entering into well to prevent from the suffocation?
Answer the asked questions on the basis of the given chemical equations.
(a) CaCO$_3$ $\xrightarrow{\triangle}$ CaO + CO$_2$
(b) Zn + H$_2$SO$_4$ $\rm \rightarrow $ ZnSO$_4$ + H$_2$
- Identify the endothermic reaction from the above reactions.
- What happens when powder of CaCO$_3$ , is used instead of pieces of CaCO$_3$ , in the chemical reaction?
Clarify the interrelation between the Hubble's study and Big Bang theory in two points.
By using a hydraulic lift a load of 2500 N needs to be lifted. If cross sectional area of the small piston is $\rm \frac {1}{10}$ of the big piston, calculate the force required to apply on small piston.
What would happen if Mendel used bottle gaurd seeds instead of pea seeds for his experiment? Write any two difficulties.
Classify bat and moss.