1
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0
An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration are t1/8 and t1/10 respectively. What is the value of $$\left[ {{{{t_{1/8}}} \over {{t_{1/10}}}}} \right] \times 10$$? ($${\log _{10}}2 = 0.3$$)
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2
IIT-JEE 2010 Paper 1 Offline
Numerical
+3
-0
The concentration of R in the reaction R $$\to$$ P was measured as a function of time and the following data is obtained
[R] molar 1.0 0.75 0.40 0.10
t (min.) 0.0 0.05 0.12 0.18
The order of reaction is
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3
IIT-JEE 2010 Paper 1 Offline
Numerical
+3
-0
The number of neutrons emitted when $${}_{92}^{235}U$$ undergoes controlled nuclear fission to $${}_{54}^{142}Xe$$ and $${}_{38}^{90}Sr$$ is
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4
IIT-JEE 2009 Paper 2 Offline
Numerical
+3
-1

The total number of $$\alpha$$ and $$\beta$$ particles emitted in the nuclear reaction $$_{92}^{238}U \to _{82}^{214}Pb$$ is _________.

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