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Israel-Stewart's causal theory of dissipative hydrodynamics, with the ADS/CFTlower limit of shear viscosity to entropy ratio ($\eta/s$=0.08), giveconsistent description of a number of experimental observables in Au+Aucollisions at RHIC (c.m. energy $\sqrt{s}$=200 GeV) \cite{Chaudhuri:2008sj}.Assuming that in Pb+Pb collisions at LHC (c.m. energy $\sqrt{s}$=5.5 TeV),except for the initial temperature, other parameters of the fluid remainunchanged, we have predicted for the centrality dependence of multiplicity,mean $p_T$, $p_T$-spectra, elliptic flow. The central temperature of the fluidis adjusted to $T_i$=421 MeV such that in a Pb+Pb collision, with participantnumber $N_{part}$=350, average charge particle multiplicity is $\sim$ 900 andis consistent with the experimental trend observed at lower energies. Compareto Au+Au collisions at RHIC, in Pb+Pb collisions at LHC, on the average,particle multiplicity increases by a factor of $\sim$1.6, the mean $p_T$ isincreased by $\sim$10% only. The elliptic flow on the other hand decreases by$\sim$15%.

Multiplicity, mean $p_T$, $p_T$-spectra and elliptic flow of identified particles in Pb+Pb collisions at LHC